List of the SARL Compiler Errors and Warnings

This page provides the exhaustive list of error and warning messages that may be generated by the SARL compiler.

The “N.” column provides a number that could be used in order to make easier your discussions with the SARL developers on the forums.

The column “Message and Description” contains information and details on each issue. The message gives a template of typical message that is given by the compiler. The cause describes the source of the issue, and provides a short explanation of the cause of the issue. The solving provides guidelines to fix the issue when it is possible.

The “Level” column indicates the level of importance for the issue. It may be:

• “error”: the issue makes the compiler failing and stopping. This type of issue can be ignored neither programmatically (see below) nor with the SARL compiler configuration.
• “warning”: the issue is an important message that may have implication on the quality of your program. But, it does not stop the compiler. This type of issue can be ignored neither programmatically (see below) nor with the SARL compiler configuration.
• “info”: the issue is a simple information message from the compiler. The impact on the quality of your program is low. The compiler is not stopped when an information message is output. This type of issue can be ignored neither programmatically (see below) nor with the SARL compiler configuration.
• “configurable”: the issue has a level (inside “error”, “warning”, “info”, “ignore”) that may be configured by the SARL developers themselves. A default level is assumed for the case the SARL developers did not specify their preferred level for the issue. It could be ignore both programmatically (see below) and with the SARL compiler configuration.
• “delegated”: it is similar to “configurable”, except that the configuration management is delegated to the Eclipse Java Development Toolkit (JDT), and its preference pages. In the case of delegated error, the associated JDT issue code is also provided for information.

In the case of an issue with a “configurable” or “delegated” level, you could select yourself the level that should be used by the SARL compiler for the issue. This configuration may be done into the preferences of the Eclipse SARL IDE or in the configuration of the sarlc command-line compiler. Additionally, you could force the SARL compiler to ignore an issue by attaching the annotation @SuppressWarnings("code") to the element that is marked with the issue. In this annotation, the code corresponds to the content of the “Code” column below. This code may have a short format (e.g., the one shown in the column), or a long format (e.g., if you move your mouse pointer on the code, you should see the long format of the code into a pop-up window). The long code is provided by the SARL compiler at the end of each of the issue messages. It is preferable to use the short code as argument to @SuppressWarnings. Nevertheless, it may be ambiguous with other issue codes that could be defined outside the SARL compiler itself (e.g. Eclipse, Checkstyle, etc.). In the case of ambiguity, you could use the long code as argument to @SuppressWarnings too.

N.	Message and Description	Level	Code
1	Message: Cannot instantiate the abstract type type-name Cause: This error is generated when you try to create an instance of an abstract class Solving: Replace type-name by the name of a concrete class	Error	abstract_class_instantiation
2	Message: Cannot directly invoke the abstract method func-prototype of the type name Cause: The function with the given func-prototype is defined as non-abstract in the current type, and it is defined as abstract into the super-type. You try to call the super-type’s method by using super.function. But, the super-type’s function is abstract. Consequently, it cannot be invoked Solving: Remove the call to the super-type function	Configurable; Default is: Error	abstract_method_invocation
3	Message: Abstract methods do not specify a body Cause: You have defined a method within an interface of a capacity with an associated block of code. Since Java 1.8, the default implementation within interfaces (i.e., a block of code that may be considered as the function’s implementation if the class implementing the interface is not providing its own code) is introduced. If you are using SARL upon an older Java environment, this error message is generated Solving: Remove the code block	Error	abstract_method_with_body
4a	Message: Ambiguous feature-call. The feature-type feature-1 and feature-2 both match Cause: You are calling a feature (method, field, etc.). But, the target feature is ambiguous. Multiple candidates were found within the scope of your call. SARL compiler cannot choose the concrete feature to be called. In order to help you, the SARL compiler provides to you the list of candidates Solving: Rewrite your code in order to remove the ambiguity	Error	ambiguous_feature_call
4b	Message: Ambiguous feature-call. The feature-type list-of-features and feature-2 all match Cause: You are calling a feature (method, field, etc.). But, the target feature is ambiguous. Multiple candidates were found within the scope of your call. SARL compiler cannot choose the concrete feature to be called. In order to help you, the SARL compiler provides to you the list of candidates Solving: Rewrite your code in order to remove the ambiguity	Error	ambiguous_feature_call
5	Message: Potential ambiguous notation for expression. The minus unary operator is applied on the result of the call to function name and not on the argument value value Cause: This warning message is generated for any expression of the form -value.name. In this case, the expression could be interpreted in the wrong way. For example, -125.abs is interpreted as -(125.abs) by SARL, i.e., -abs(125). It is not interpreted as abs(-125). If you would pass -125 to the function, you must use parentheses, i.e. (-125).abs Solving: Put parentheses around the minus unary operator and the value, i.e., (-value).name	Configurable; Default is: Warning	ambiguous_interpretation_by_developper
6	Message: The anonymous subclass of type-name does not implement list-of-functions Cause: Because anonymous class cannot be abstract, all the abstract functions that are inherited must be implemented into the anonymous class Solving: Implement the missed functions	Error	anonymous_class_missing_members
7	Message: A static field of an anonymous class must be final Cause: Because an anonymous class is a class, we can declare static fields for sharing data between the difference instances of the anonymous class (that is the usual usage of static fields for regular classes). However, because an anonymous class is attached to its enclosing context, any side-effect applied by the change of the static field’s value must be avoided. That’s why a static field in an anonymous class must be unmodifiable, i.e., defined with val or marked with the final modifier Solving: Replace var keyword by val; or add the static modifier to the field	Error	anonymous_class_static_field
8	Message: A method of an anonymous class cannot be static Cause: Because an anonymous class is not a named type, we cannot refer to its functions with a static notation (that is the name of the type, followed by the name of the function). Consequently, it is forbidden to define a static function into an anonymous class Solving: Remove static modifier from the function prototype	Error	anonymous_class_static_method
9a	Message: Assignment to final field Cause: You try to assign a value to a field that is declared as final, e.g., val myvar or final var myvar. Since the field is declared as final, its value cannot be changed Solving: Remove the final modifier on the field; or assign to another not-final field	Error	assignment_to_final
9b	Message: Assignment to final parameter Cause: You try to assign a value to a parameter. Parameters are always considered as final from the SARL specification. Since the parameter is declared as final, its value cannot be changed Solving: Assign to another not-final variable	Error	assignment_to_final
9c	Message: Assignment to final variable Cause: You try to assign a value to a variable that is declared as final, e.g., val myvar or final var myvar. Since the variable is declared as final, its value cannot be changed Solving: Remove the final modifier on the variable; or assign to another not-final variable	Error	assignment_to_final
10	Message: The left-hand side of an assignment must be a variable Cause: According to the definition of the assignment operator, the left operand must always be a variable or a field that is not declared as final. When this error message is generated, it means that the left operand is neither a variable nor a field. Please not that the use of the assignment operator may be considered as a call to a “setter” function. In this case, this error message is not generated Solving: Replace the left operand with an appropriate variable or field	Error	assignment_to_no_variable
11	Message: A dispatch method’s name must not start with an underscore Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. Internally, each block is attached to an hidden function with a name started with an underscore _ character. In order to avoid any conflict with the internal functions, it is forbidden to start the name of a dispatch function with an underscore character Solving: Rename your dispatch function	Error	case_func_name_starts_with_underscore
12	Message: A dispatch method must not declare any type parameters Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. This error message is generated when a generic type parameter is defined in the dispatch function prototype; that is forbidden Solving: Remove generic type declaration	Error	case_function_with_type_params
13	Message: A dispatch method must at least have one parameter declared Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. This error message is generated when a dispatch function has no parameter delcared Solving: Add a formal parameter	Error	case_function_without_params
14	Message: Recursive constructor invocation Cause: You have defined several constructors into your type that are calling other constructors in the type. The sequence of constructor’s calls contains a loop; that is forbidden. An example of failing code is: class X {   new (x : int) {     this('c')   }   new (x : char) {     this(1)   } } Solving: Rewrite your code to avoid cyclic calls to the constructors	Error	circular_constructor_invocation
15a	Message: Invalid supertype. Expecting a class Cause: According to the syntax of SARL, a type (class, agent, skill, etc.) extends another type. This error message indicates to you that the type after extends is not a type implemented with a Java class, when it is expected to have one Solving: Remove the extends statement; or replace the invalid type by the appropriate class	Error	class_expected
15b	Message: Superclass must be a class Cause: According to the syntax of SARL, a class extends another class. This error message indicates to you that the type after extends is not a class Solving: Remove the extends statement; or replace the invalid type by the appropriate class	Error	class_expected
16	Message: The class type-name must be defined abstract because it does not implement list-of-functions Cause: You have defined abstract functions into type-name, or abstract functions are inherited without beeing implemented. In this case, the type-name must also be defined as abstract because abstract functions can only be defined into an abstract type Solving: Add abstract modifier to type-name	Error	class_must_be_defined_abstract
17a	Message: The non-abstract method first-prototype inherited from first-type conflicts with the method second-prototype inherited from second-type Cause: This error message is generated when the current type inherited from two functions from types first-type and second-type, and there is a conflict between the signatures of these functions	Error	conflicting_default_methods
17b	Message: The type type-name inherits multiple implementations of the method func-prototype from first-type and second-type Cause: This error message is generated when the current type with name type-name inherited a block of code for the function with the signature func-prototype, either from the super-type named first-type and the one named second-type. It is impossible for the SARL compiler to determine which one of the two blocks of code to be associated to type-name	Error	conflicting_default_methods
18	Message: Constant condition is always boolean-constant Cause: The loop, if-then and switch statements may have a boolean condition that is evalued to true or false. In this case, the statement itself is superfluous. For example, in the case of a while-loop, if the condition is alwaus true, the loop will never exit. This issue message notifies you that a potentiel problem is detected because of the evaluation of an expression to true or false	Configurable; Default is: Warning	constant_condition
19	Message: Constructors are only permitted within agents, behaviors, skills, events and classes Cause: You try to define a construction in a type that cannot contains a constructor construct. Only specific types could contain a constructor. They are basically those that may corresponds to an object-oriented class, e.g. class, agent, behavior and skill	Error	constructor_not_permitted
20a	Message: Type parameters are not supported for constructors Cause: A constructor cannot have generic type parameters Solving: Remove the generic type parameters	Error	constructor_type_params_not_supported
20b	Message: Unexpected type parameter to a static constructor Cause: A static constructor cannot have generic type parameters Solving: Remove the generic type parameters	Error	constructor_type_params_not_supported
21	Message: any-message Cause: Sometime, the Java code that is generated by the SARL compiler may contain compilation errors from the Java compiler point of view. This error code enables the SARL validator to forward the errors that were found into the Java code to be automatically attached to the SARL statement that is the source of the failing Java code Solving: Contact the SARL development team	Configurable; Default is: Error	copyJavaProblems
22a	Message: ‘Create’-method name is not permitted in an interface Cause: Creation method is inspired from the factory-method design pattern. It is forbidden to define this type of method inside an interface Solving: Remove the creation method from the interface and move it in another type	Error	create_functions_must_not_be_abstract
22b	Message: The ‘create’-method func-name in type type-name must not be abstract Cause: Creation method is inspired from the factory-method design pattern. It is forbidden to define this type of method without code Solving: Add source code to the creation method	Error	create_functions_must_not_be_abstract
23	Message: The inheritance hierarchy of type contains cycles Cause: According the inheritance definition, that is common to SARL and the object-oriented programming languages, cyclic into the inheritance hierarchy is totally forbidden	Error	cyclic_inheritance
24a	Message: The constructor name is deprecated Cause: The constructor that you are calling is marked as deprecated directly, or one of its enclosing types is marked as deprecated Solving: Read the deprecation comment and update your code accordingly Delegated to: org.eclipse.jdt.core.compiler.problem.deprecation	Delegated; Default is: Warning	deprecated_member_reference
24b	Message: The enum literal name is deprecated Cause: The enum literal that you are using is marked as deprecated directly, or one of its enclosing types is marked as deprecated Solving: Read the deprecation comment and update your code accordingly Delegated to: org.eclipse.jdt.core.compiler.problem.deprecation	Delegated; Default is: Warning	deprecated_member_reference
24c	Message: The field name is deprecated Cause: The field that you are accessor is marked as deprecated directly, or one of its enclosing types is marked as deprecated Solving: Read the deprecation comment and update your code accordingly Delegated to: org.eclipse.jdt.core.compiler.problem.deprecation	Delegated; Default is: Warning	deprecated_member_reference
24d	Message: The method func-prototype from the type container-name is deprecated Cause: The method that you are calling is marked as deprecated directly, or one of its enclosing types is marked as deprecated Solving: Read the deprecation comment and update your code accordingly Delegated to: org.eclipse.jdt.core.compiler.problem.deprecation	Delegated; Default is: Warning	deprecated_member_reference
24e	Message: The type name is deprecated Cause: The type that you are referencing is marked as deprecated directly, or one of its enclosing types is marked as deprecated Solving: Read the deprecation comment and update your code accordingly Delegated to: org.eclipse.jdt.core.compiler.problem.deprecation	Delegated; Default is: Warning	deprecated_member_reference
25a	Message: Discouraged boolean value. The guard is always true Cause: It is discouraged to have the constant true as condition of an behavior unit’s guard. Indeed, a condition that is always evaluated to true makes the test void and time consuming for nothing Solving: Remove the guard of the behavior unit	Configurable; Default is: Warning	discouraged_boolean_expression
25b	Message: Unexpected assertion due to its positive test result Cause: It is discouraged to have the constant true as condition of the assert statement. Indeed, a condition that is always evaluated to true for an assertion test makes this test void and time consuming for nothing Solving: Remove the assert statement	Configurable; Default is: Warning	discouraged_boolean_expression
26	Message: Discouraged capacity definition. A capacity without actions defined inside is not useful since it cannot be called by an agent or a behavior Cause: Message is explicit. There no sense to create a capacity without action according to the SARL metamodel Solving: Define an action within the capacity; or delete the capacity	Configurable; Default is: Warning	discouraged_capacity_definition
27	Message: Invalid action name ‘n’. You must not give to an action a name with reserved characters Cause: Several names are discouraged to be used by the SARL compiler. One reason may be because the name is expected to be used as part of the language in future releases. Or, the name is amgiguous. For example, the name “self” is discouraged by the SARL compiler Solving: Change the function name	Configurable; Default is: Warning	discouraged_function_name
28	Message: Discouraged use of the name keyword inside a basic loop Cause: The SARL keyword with the name cannot be used in a loop. For example, break and continue statements enable to stop the execution of a loop step by continuing the execution after the loop itself or at the next loop step, respectivelly. However, according the algothimic best practices, it is not recommended to use the break or continue statement for stopping a loop. It may denote a poor algorithmic analysis Solving: Rewrite the loop code	Configurable; Default is: Warning	discouraged_loop_breaking_keyword_use
29a	Message: Possible invalid usage of ‘name’. An impure function is detected into the sequence of calls on ‘name’. Because an impure function has a possible side effect and side effect is not allowed on ‘name’, it may cause an unexpected or invalid running behavior. You have to ensure by yourself that the usage of ‘name’ is valid Cause: The keyword with name represents a read-only feature. It is usually occurrence that represents the current instance of the just-received event within a behavior unit. It is assumed within the SARL operational semantics that occurrence instance is an unmodifiable event in order to ensure consistency between the different behavior units that handle the occurrence. This message is generated one component of the occurrence event is used in a way that its value may be changed. The SARL compiler is not sure that a change is applied to the occurrence from the code analysis. It notifies you that you have to double check the usage of occurrence and validate that no side-effect exist on it. If the used component of occurrence is of immutable type, then this issue does not exist Solving: Rewrite your code to avoid the use of the impure function(s)	Configurable; Default is: Warning	discouraged_occurrence_readonly_use
29b	Message: Possible invalid usage of ‘name’. The value of the feature ‘name’ or one of its component is used as an argument of a function. This function is not marked as a pure function, i.e. without side effect. Because side effect is not allowed on ‘name’, it may cause an unexpected or invalid running behavior. You have to ensure by yourself that the usage of ‘name’ is valid Cause: The keyword with name is a read-only feature that seems to be used as an read-write variable Solving: Mark with @Pure the function that takes the feature with name as argument; or Change your code to avoid the passing of the feature with name` to the concerned function	Configurable; Default is: Warning	discouraged_occurrence_readonly_use
29c	Message: Possible invalid usage of ‘name’. The value of the feature ‘name’ or one of its component seems to be copied within a local variable. Because side effect is not allowed on ‘name’, it may cause an unexpected or invalid running behavior. You have to ensure by yourself that the usage of ‘name’ is valid Cause: The keyword with name is a read-only feature that seems to be used as an read-write variable Solving: Rewrite your code to avoid the use of the impure function(s)	Configurable; Default is: Warning	discouraged_occurrence_readonly_use
30	Message: Discouraged feature call: feature. You should use the dedicated language keyword, or an agent’s capacity in place of this feature call Cause: This error is generated when a discouraged feature call is detected. The features that outside the best practices are: System::err, System::out, System::setErr, System::setOut, System::console, System::inheritedChannel, System::exit (when called from an object-oriented type), with a named starting with “InputOutput” or “Thread”. these different features are considered to be too low level to be used into a agent-oriented program Solving: Remove the call	Error	discouraged_reference
31	Message: Dispatch methods have arguments with different primitive types Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. You could define more formal parameters than the mandatory one. This issue message is generated when the formal parameters at the same position into the prototypes of a dispatch function have not the same primitive type. It may cause issues, e.g., a loose of information due the automatic boxing of the parameter values Solving: Change the primitive types to have the same in all the prototypes	Configurable; Default is: Warning	dispatch_functions_different_primitive_args
32	Message: Static and non-static dispatch methods can not be mixed Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. It is forbidden to mix static and not static prototypes for a single dispatch function Solving: Make static or non-static all the prototypes of the same dispatch function	Error	dispatch_functions_mixed_static_and_non_static
33	Message: The dispatch method fct-name in type type-name must not be abstract Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. Because of this definition, it is forbidden to define, implictly or explicitly, a dispatch function as abstract Solving: Add block of code for the dispatch function	Error	dispatch_functions_must_not_be_abstract
34	Message: The dispatch method must not be static because the dispatch methods in the superclass are not static Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. This error message is generated when a dispatch function into the current type is defined as static function; while the dispatch functions defined into the super-type are not defined as static. You cannot mix static and non-static definitions Solving: Remove static modifier from the prototype of the local dispatch function	Error	dispatch_functions_non_static_expected
35	Message: The dispatch method must be static because the dispatch methods in the superclass are static Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. This error message is generated when a dispatch function into the current type is not defined as static function; while the dispatch functions defined into the super-type are defined as static. You cannot mix static and non-static definitions Solving: Add static modifier to the prototype of the local dispatch function	Error	dispatch_functions_static_expected
36	Message: All local dispatch methods must have the same visibility Cause: A dispatch function is a function to which multiple blocks of code are attached to. Each block of code is invoked according to a specific type of the first formal parameter of the dispatch function. It is forbidden to define the different prototypes for a single dispatch function with different visibilities Solving: Use the same function visility for all the prototypes of the same dispatch function	Error	dispatch_functions_with_different_visibility
37a	Message: Dispatch method has same name and number of parameters as non-dispatch method Cause: A conflict is detected between the name of a dispatch function and the name of not-dispatching function. In this case, the SARL compiler is still able to invoke both functions. Nevertheless, it introduces an ambiguity for the caller of the functions that may have a call to the wrong function. This issue message notifies you that you have to take care of this situation, and ensure that the calls to functions are targeted the right function code Solving: Rename the dispatch function; or the non-dispatch function	Configurable; Default is: Warning	dispatch_plain_function_name_clash
37b	Message: Non-dispatch method has same name and number of parameters as dispatch method Cause: A conflict is detected between the name of a dispatch function and the name of not-dispatching function. In this case, the SARL compiler is still able to invoke both functions. Nevertheless, it introduces an ambiguity for the caller of the functions that may have a call to the wrong function. This issue message notifies you that you have to take care of this situation, and ensure that the calls to functions are targeted the right function code Solving: Rename the dispatch function; or the non-dispatch function	Configurable; Default is: Warning	dispatch_plain_function_name_clash
38	Message: Duplicate case Cause: Into a switch statement, you have specified multiple times the same case, i.e., with the same case expression. Then, it is impossible to branch to a single case from the expression evaluated by the switch statement. This ambiguous branching is forbidden Solving: Remove one of the cases; or merge the two cases into a single case	Error	duplicate_case
39a	Message: Duplicate extension with same type Cause: Extension on fields is supported by SARL syntax. This error message is generated when two extensions have the same name. It is forbidden because they generate two hidden fields with the same name Solving: Rename one of the extensions	Error	duplicate_field
39b	Message: Duplicate field name Cause: It is forbidden to define multiple fields with the same name into the same type. This error message is generated when two fields have the given name Solving: Rename one of the two fields	Error	duplicate_field
40	Message: Duplicate interface Cause: This warning message is generated when a type is implemented the same interface multiple times` Solving: Remove the extra declarations of the implemented interface	Configurable; Default is: Warning	duplicate_interface
41a	Message: Duplicate dispatch methods. Primitives cannot overload their wrapper types in dispatch methods Cause: It is forbidden to define a dispatch function without the same prototype/erasure as an inherited dispatch function Solving: Change the prototype of the dispatch function in order to be compatible with the prototype of the inherited dispatch function	Error	duplicate_method
41b	Message: Duplicate method func-prototype in type type-name Cause: It is forbidden to define two times a function with the same prototype/erasure. This error message is generated when two functions has the same prototype inside the current type declaration Solving: Rename one of the functions; or change the erasure of one of them	Error	duplicate_method
41c	Message: Name clash: The method func-prototype of type type-name has the same erasure as other-prototype of type other-type but does not override it Cause: It is forbidden to define a non-static function without the same prototype/erasure as an inherited non-static static function Solving: Change the func-prototype to be compatible with other-prototype	Error	duplicate_method
41d	Message: The instance method func-prototype cannot override the static method static-prototype of type type-name Cause: It is forbidden to define a function with the same prototype/erasure as an inherited static function without adding the staticmodifier to the inheriting function prototype Solving: Add static modifier to the function prototype	Error	duplicate_method
41e	Message: The method func-prototype has the same erasure func-erasure as another method in type type-name Cause: It is forbidden to define two times a function with the same prototype/erasure. This error message is generated when two functions has the same prototype inside the current type declaration Solving: Rename one of the functions; or change the erasure of one of them	Error	duplicate_method
42a	Message: Duplicate implicit parameter ‘name‘ Cause: You cannot define with the same name two formal parameters into the same function. In the context of the erroneous code, an implicit parameter may be defined and named it. You may have also explicitly defined a formal parameter named it. There is a conflict between the names Solving: Rename your explicit formal parameter	Error	duplicate_parameter_name
42b	Message: Duplicate parameter name Cause: You cannot define with the same name two formal parameters into the same function Solving: Rename one of the formal parameters	Error	duplicate_parameter_name
43a	Message: Duplicate nested type name Cause: It is forbidden to define into an enclosing type two type declarations with the same given name Solving: Rename one of the inner types	Error	duplicate_type
43b	Message: Duplicate type name Cause: It is forbidden to define into a SARL file two type declarations with the same given name Solving: Rename one of the types	Error	duplicate_type
43c	Message: The type name is already defined Cause: It is forbidden to define into a SARL file two type declarations with the same given name Solving: Rename one of the types	Error	duplicate_type
43d	Message: The type name is already defined in file filename Cause: It is forbidden to define into a SARL file two type declarations with the same given name Solving: Rename one of the types	Error	duplicate_type
44	Message: Duplicate type name Cause: This warning message is generated two types are defined in the same file with the same name Solving: Change the name of one of the duplicate types	Error	duplicate_type_name
45	Message: The operator ‘name’ should be replaced by ‘name=’ when null is one of the arguments Cause: This error message is generated when one of the (in)equality test operators == and != is invoked with the null literal as left or right operand, e.g. x == null or null == x, and the other operand being of primitive type. These two test operators implement deep (in)equality tests. A better practice is to invoke the operator === or !==, which implement reference tests. Indeed, null value is a reference to nothing. It is better to compare a reference to another reference. And, the reference test operators are the most efficient for that Solving: Replace == by ===, or != by !==	Configurable; Default is: Warning	equals_with_null
46	Message: Exception type-name is declared twice Cause: You have declared two times the same exception after a throw keyword Solving: Remove one occurrence of type-name	Error	exception_declared_twice
47	Message: No exception of type type-name can be thrown; an exception type must be a subclass of Throwable Cause: You have specified a type after the thrown keyword that is not a subtype of Throwable. This type comes from the Java API, and represents all the throwable objects, e.g., the exceptions, into the virtual machine. You must given sub-types of Throwable after the thrown keyword Solving: Remove type-name; or replace it by an appropriate type	Error	exception_not_throwable
48	Message: Cannot access the type-name feature-name with parentheses Cause: This error is generated when you try to access to a field with parentheses. Let be the field x defined. The code x() causes this error because x is a field, not a method Solving: Remove the parentheses	Error	field_access_with_parentheses
49	Message: The final field name may already have been assigned Cause: You try to change the value of a final field after it was initialized. A value could be given to a final field only one time, i.e. its initialization Solving: Remove the expression that try to change the final field	Error	field_already_initialized
50a	Message: The blank final derived field name may not have been initialized Cause: Final fields must be initialized when they are declared, or inside the enclosing type constructor (when writing a constructor is possible). You have declared a final field that is never initialized Solving: Add initialization value to the field	Error	field_not_initialized
50b	Message: The blank final field name may not have been initialized Cause: Final fields must be initialized when they are declared, or inside the enclosing type constructor (when writing a constructor is possible). You have declared a final field that is never initialized Solving: Add initialization value to the field	Error	field_not_initialized
51a	Message: Access restriction: The type name is not accessible Cause: This error is generated when a reference to the type with the given name is detected, and the type is not visible/accessible Solving: Remove type reference	Error	forbidden_reference
51b	Message: Default value’s expression cannot reference the not-pure operation: name Cause: This error message is generated when a reference to a non-pure function is detected into the expression of the default value for a formal parameter. Only pure functions could be used for building a default value expression in order to avoid unexpected side-effects Solving: Remove the reference to the not-pure function	Error	forbidden_reference
51c	Message: Forbidden annotation in a SARL program Cause: An annotation is used into the code. But this annotation is forbidden because it is reserved for internal usage, or it is not supported by the SARL compiler Solving: Remove the annotation	Error	forbidden_reference
51d	Message: Forbidden annotation to the agent-oriented type type-name Cause: An active annotation, i.e. an annotation that causes a specific generation of code by the SARL compiler, is attached to an agent-oriented type, e.g. agent, behavior, etc. But, it is forbidden to attached the active annotation to an agent-oriented type Solving: Remove the active annotation	Error	forbidden_reference
51e	Message: Forbidden annotation to the object-oriented type type-name Cause: An active annotation, i.e. an annotation that causes a specific generation of code by the SARL compiler, is attached to an object-oriented type, e.g. class, interface, etc. But, it is forbidden to attached the active annotation to an object-oriented type Solving: Remove the active annotation	Error	forbidden_reference
51f	Message: Forbidden feature call: feature Cause: This error is generated when a forbidden feature call is detected. The forbidden features to call are: System::exit when it is inde an agent-oriented type, e.g. agent; with a name containing the forbidden character $.; or the feature is part of a private API and the caller is not part of the private API Solving: Remove the call	Error	forbidden_reference
51g	Message: Forbidden reference to not final field name from a constructor’s default value expression Cause: This error message is generated when a reference to a not-final field is detected into the expression of the default value for a constructor’s formal parameter. Only final fields could be used for building a default value expression of a constructor in order to avoid unexpected side-effects Solving: Remove the reference to the not final field	Error	forbidden_reference
52	Message: The generic type parameter ‘name’ is hiding the generic type parameter of ‘type-name‘ Cause: This error is generated when you declared a generic type parameter for an action that has the same name as another generic type parameter that is declared into the enclosing type (class, or interface) Solving: Change the name	Error	generic_type_name_shadowing
53a	Message: Cannot instantiate the name Cause: You try to create an instance of a type named name with the new instruction. The type with the given name cannot be instanciated due to several reasons, e.g., it is defiend as abstract, it has no visible constructor, etc	Error	illegal_class_instantiation
53b	Message: Cannot instantiate the annotation type name Cause: You try to create an instance of an annotation named name with the new instruction. It is impossible to create an instance of annotation	Error	illegal_class_instantiation
53c	Message: Cannot instantiate the enum type name Cause: You try to create an instance of an enumeration named name with the new instruction. It is impossible to create an instance of enumeration	Error	illegal_class_instantiation
53d	Message: Cannot instantiate the interface type name Cause: You try to create an instance of an interface named name with the new instruction. It is impossible to create an instance of interface	Error	illegal_class_instantiation
53e	Message: Cannot instantiate the primitive type name Cause: You try to create an instance of a primitive type named name with the new instruction. Since a primitive type is not object-oriented, it is impossible to create an instance of primitive type	Error	illegal_class_instantiation
53f	Message: Cannot instantiate the type parameter name Cause: You try to create an instance of a type parameter named name with the new instruction. Since the concrete type represented by the type parameter is not known at compile time, creation of an instance of name is impossible	Error	illegal_class_instantiation
54	Message: Cannot reference the field ‘name’ before it is defined Cause: You try to have access to a field before it is defined within the sequence of statements ofyour code. This error should never append in SARL code. It was defined for “safety” reasons Solving: Move the field definition before its first usage	Error	illegal_forward_reference
55	Message: Illegal redefinition of the default value for the formal parameter name. Inherited value is: original value. While the current value is: redefined value Cause: This error message is generated when you declared a default value for a formal parameter that is different from the corresponding default value that was declared into the super types. You cannot change the default value of a formal parameter because it may cause unexpected side-effects for the callers of the function Solving: Remove the redundant declaration fo the default value	Error	illegal_parameter_default_value_redefinition
56	Message: Implicit return Cause: By default, it is not necessary to specify an explicit return statement inside the code block of a function. The SARL compilier assumes that the last executed instruction gives the value to be returned by the function. This issue message is generated when an implicit return is used within a function Solving: Add an explicit return	Configurable; Default is: Ignored	implicit_return
57	Message: The import ‘package-1.name’ collides with the import ‘package-2.name‘ Cause: This error is generated when you define into the list of import two types with the same simple name. In this case, it is impossible to determine if an occurrence of name into the code refers to the type in the package package-1 or in the package package-2 Solving: Remove one of the import	Error	import_collision
58	Message: The import ‘package.name’ conflicts with a type defined in the same file Cause: You are importing a type with the given name into the given package. But, you have also defined a local type with the name. In this case, it is impossible to determine if an occurrence of name into the code refers to the local type or the imported type Solving: Rename the local type	Error	import_conflict
59	Message: The import name cannot be resolved Cause: The name that is provided after an import cannot be found Solving: Remove the import statement	Configurable; Default is: Error	import_unresolved
60	Message: The import ‘name’ is never used Cause: This issue message is generated when an import statement does not provide features that are used into the current file Solving: Remove import statement	Configurable; Default is: Warning	import_unsued
61	Message: The use of wildcard imports is deprecated Cause: You are importing all the types that are defined into a package with import pkg.*. This instruction has two major drawbacks. Firstly, the really used types within the current are not explicit because of the wildcard. Second, the SARL compiler loads in memory too much type definitions for compiling the current file Solving: Replace the wildcard by the really used types	Configurable; Default is: Warning	import_wildcard_deprecated
62	Message: The declared exception exception-type is not compatible with throws clause in exception-list Cause: According the inheritance definition, that is common to SARL and the object-oriented programming languages, overridable functions as associated to a contract with their callers. This contract indicates that the prototype of the function will never changed, and the function will have the same thrown exceptions always. This contract must be fullfil by the overriding functions. This error message is generated when your overriding function has a list of exceptions after the thrown keyword that is not compatible with the list defined into the inherited function. An exception of type “a” in the overriding function must be also a “b”, where “a” is equals to “b” or a sub-type of “b” Solving: Change the list of exceptions after throws keyword to the appropriate exception types	Error	incompatible_throws_clause
63a	Message: Incompatible types. Expected expected-type but was actual-type Cause: The value that is specified after a return statement has a type that is incompatible with the return type of the enclosing function Solving: Rewrite the return’s expression in order to have a compatible type; or change the return type of the function to be compatible with those of the return expression	Error	incompatible_types
63b	Message: No exception of type type-name can be thrown; an exception type must be a subclass of Throwable Cause: Inside a catch statement, you have specified a type-name that does not correspond to a sub-type of Throwable. The parameter of the catch statement must be a throwable type, or a collection of throwable types Solving: Rewrite type-name by an appropriate throwable type	Error	incompatible_types
63c	Message: Type mismatch: cannot convert from source-type to target-type Cause: The value cannot be converted from the source-type to the target-type because there is neither implicit nor explicit conversion function Solving: Rewrite the expression in order to have a compatible type	Error	incompatible_types
64a	Message: The enum constant name needs a corresponding case label in this enum switch on type-name Cause: You have specified an enumerated value to a switch condition. The enumeration constant with the given name has not a corresponding case into the switch. It means that all the possible cases are not explicitly covered; It is preferrable they are all covered Solving: Add a case for the missed constant name	Configurable; Default is: Warning	incomplete_cases_on_enum
64b	Message: The enum constants list-of-names need a corresponding case label in this enum switch on type-name Cause: You have specified an enumerated value to a switch condition. The enumeration constants with the given names have not corresponding case into the switch. It means that all the possible cases are not explicitly covered; It is preferrable they are all covered Solving: Add a case for each missed constant name	Configurable; Default is: Warning	incomplete_cases_on_enum
65a	Message: Incompatible return type of dispatch method. Expected inherited type but was specified type Cause: This error message is generated when an overriding function has a specified type that is incompatible with the inherited type defined for the method into the super-type Solving: Replace the return type with a compatible type	Error	incomptible_return_type
65b	Message: The return type is incompatible with func-prototype Cause: This error message is generated when an overriding function has a specified type that is incompatible with the inherited type defined for the method into the super-type Solving: Replace the return type with a compatible type	Error	incomptible_return_type
66	Message: The static feature-type feature-name should be accessed in a static way Cause: For a instance function, you try to access to a static feature using a non-static syntax, e.g. obj.StaticFeature. It is preferable to use the static call syntax, e.g. MyType::StaticFeature, where MyType is the type of the object obj from the previous example Solving: Replace the non-static syntax by the static syntax Delegated to: org.eclipse.jdt.core.compiler.problem.staticAccessReceiver	Delegated; Default is: Warning	instance_access_to_static_member
67a	Message: Extended interface must be an interface Cause: According to the syntax of SARL, an interface extends another interface. This error message indicates to you that the type after extends is not an interface Solving: Remove the extends statement; or replace the invalid type by the appropriate class	Error	interface_expected
67b	Message: Implemented interface must be an interface Cause: According to the syntax of SARL, a class implements interfaces. This error message indicates to you that one type after implements is not an interface Solving: Remove the extends statement; or replace the invalid type by the appropriate class	Error	interface_expected
67c	Message: Invalid supertype. Expecting feature Cause: According to the syntax of SARL, a type (agent, capacity, etc.) extends another type. This error message indicates to you that the type after extends is not of a type that is expected. The name of the feature shows the expectation Solving: Remove the extends statement; or replace the invalid type by the appropriate type	Error	interface_expected
68	Message: any-message Cause: This error is generated when the SARL compiler has encountered an internal error	Error	internal_error
69	Message: Invalid type: ‘type-name’. Only capacities can be used after the keyword ‘uses‘ Cause: The keyword uses enables to uses and import capacities within the scope of the entity (agent, behavior, etc.) in which the uses is specified. This error is generated when the type named type-name that is specified after an uses is not a sub-type of Capacity, i.e. it is not a capacity type Solving: Remove the type-name after the keyword uses; or replace type-name by the name of an appropriate capacity	Error	invalid_capacity_type
70a	Message: Cannot cast from type-name-1 to type-name-2 Cause: The operands of the cast operator as have not compatible types. SARL compiler has found no way to convert a value of the type with name type-name-1, which is the type of the left operand of the as operator, to a value of the type with name type-name-2, which is the right operand of the as operator Solving: Change the left expression in order to be of a compatible type with the right operand; or Replace type-name-2 by an appropriate type name; or Define a “totype-name-2()” function if type-name-2 is a class; or Define a “type-name-2Value()” function if *type-name-2 is a primitive type	Error	invalid_cast
70b	Message: Cannot cast from void to type-name-2 Cause: Since void represents the fact that there is not value, it is impossible to convert “nothing” to a value, whatever its type Solving: Remove as operator	Error	invalid_cast
71a	Message: Cannot refer to an instance field field-name while explicitly invoking a constructor Cause: According to the standards of object-oriented programming, nothing could append into an object before it was constructed. It means that when you are calling a constructor from inside a constructor’s block of code, the object is not yet built. Consequently, you cannot have access to the object’s fields (not static) Solving: Rewrite the arguments to avoid the access to the object’s field	Error	invalid_constructor_argument
71b	Message: Cannot refer to an instance method while explicitly invoking a constructor Cause: According to the standards of object-oriented programming, nothing could append into an object before it was constructed. It means that when you are calling a constructor from inside a constructor’s block of code, the object is not yet built. Consequently, you cannot have access to the object’s method (not static) Solving: Rewrite the arguments to avoid the access to the object’s method	Error	invalid_constructor_argument
72	Message: Constructor call must be the first expression in a constructor Cause: According to the standards of object-oriented programming, nothing could append into an object before it was constructed. It means that the first possible instruction within any constructor’s code is a call to another constructor. This call may be explicit or implicit. This error is generated by your constructor’s code starts with statements that are not a constructor calls, followed by a constructor call Solving: Move the constructor call first	Error	invalid_constructor_invocation
73a	Message: Invalid annotation value. skill-name is not an implementation of capacity-name Cause: The @DefaultSkill annotation enables to specify programmatically the skill that may be used by default by an agent for implementing a capacity. The parameter named skill-name of the @DefaultSill must be a skill that implements the capacity capacity-name Solving: Remove the @DefaultSkill; or replace skill-name by an appropriate skill type name	Error	invalid_default_skill_annotation
73b	Message: Invalid annotation value. It must be a type literal to a skill Cause: The @DefaultSkill annotation enables to specify programmatically the skill that may be used by default by an agent for implementing a capacity. The parameter of the annotation must be the type name of a skill Solving: Remove the @DefaultSkill; or replace skill-name by an appropriate skill type name	Error	invalid_default_skill_annotation
74	Message: Return is not allowed in creation expression Cause: This error message is generated when a return statement is defined in a context that cannot allow a return, such as a creation expression Solving: Remove the return statement	Error	invalid_early_exit
75a	Message: Supertype must be a subtype of ‘type-name‘ Cause: This error message is generated when the provided type after the extends statement is invalid; because it is not a sub-type of type-name strictly (i.e., not type-name itself) Solving: Remove the type after extends; or replace it by the appropriate name of a sub-type of type-name	Error	invalid_extended_type
75b	Message: Supertype must be of type ‘type-name‘ Cause: This error message is generated when the provided type after the extends statement is invalid; because it is neither equals to type-name nor a sub-type of type-name Solving: Remove the type after extends; or replace it by the appropriate name of a sub-type of type-name	Error	invalid_extended_type
76	Message: The primitive type name is not a valid extension Cause: Extension on fields is supported by SARL syntax. The purpose is to call the member of an object or a type that is marked by extension. A primitive type has no member. Consequently, using the extension on a variable of primitive type is impossile Solving: Remove extension; or replace the primitive type by its object-oriented equivalent	Error	invalid_extension_type
77	Message: any-message Cause: Extra-language generator is an extension module of the SARL compiler. It has the role to generate source code in a specific programming language, e.g., Python, that is not supported by the core generator of the SARL compiler, i.e., Java. When the extra-language generator encounters an issue (error, warning or information), it is notified with is issue code	Error	invalid_extra_language_generation
78	Message: Invalid type: ‘type-name’. Only events can be used after the keyword ‘fires’ Cause: The keyword fires specifies the events that could be fired by a function. This error is generated when the type named type-name that is specified after an fires is not a sub-type of Capacity, i.e. it is not a capacity type Solving: Remove the type-name after the keyword fires; or replace type-name by the name of an appropriate capacity	Error	invalid_firing_event_type
79	Message: any-message Cause: This error message is generated when you pass an invalid type to a generic parameter type. Caution: this issue seems not to have a message template from the Xtext/Xbase source code Solving: Change the type argument	Error	invalid_generic_argument_types
80	Message: ‘name’ is not a valid identifier Cause: This error is generated when you are using an identifier that is corresponding to a keyword of the Java programming language. Since the SARL compiler create Java source file, in order to make the generated files compilable, any variable with a name equals to a JAva keyword must be avoided Solving: Change the name	Error	invalid_identifier
81a	Message: Invalid implemented type: ‘type-name’. Only subtypes of ‘expected-name’ are allowed for ‘element-name‘ Cause: This error message is generated when the provided type named type-name is invalid when it is specified for an implements statement; because it is not a sub-type of expected-name strictly (i.e., not expected-name itself). When it is used for the definition of element-name, an implemented type must fullfil the previous typing constraint Solving: Remove type-name; or replace it by the appropriate name of a sub-type of expected-name	Error	invalid_implemented_type
81b	Message: Invalid implemented type: ‘type-name’. Only the type ‘expected-name’ and one of its subtypes are allowed for ‘element-name‘ Cause: This error message is generated when the provided type named type-name is invalid when it is specified for an implements statement; because it is neither equals to expected-name nor a sub-type of expected-name. When it is used for the definition of element-name, an implemented type must fullfil the previous typing constraint Solving: Remove type-name; or replace it by the appropriate name of a sub-type of expected-name	Error	invalid_implemented_type
82a	Message: Expression with side effect is not allowed in guards Cause: The guard that is specified for a behavior unit may have side effect, i.e. it may modify the state of the current agent/behavior/skill, or of another object. According to the SARL specification, the behavior units’ guards must not have any side-effect because the guard’s expression could be evaluated in parallel for different behavior units on the same event. In order to be consistent between the different evaluations of the guard, the guard expression cannot change the state of any object Solving: Rewrite the guard expression to avoid the uses of side-effect expressions	Error	invalid_inner_expression
82b	Message: This expression is not allowed in this context, since it doesn’t cause any side effects Cause: This error is generated when you write an expression without side effect, where one is expected. For example, the following code generates this error: def fct : void {   var x = 1 } In this case, the variable declaration has not side effect; and should not be used in this context Solving: Remove the expression without side-effect	Error	invalid_inner_expression
83a	Message: Cannot perform instanceof check against parameterized type type-name Cause: You have written a instanceof operator with a right operand containing a generic type parameter, e.g. x instanceof MyType<T>. It is impossible for now to the SARL compiler to consider the generic type parameter, e.g. T Solving: Remove the generic type parameter from the right operand’s expression	Error	invalid_instanceof
83b	Message: Cannot perform instanceof check against primitive type type-name Cause: You have written a primitive type as right operand of the instanceof operator. Since a primitive type is not object-oriented, it is impossible to test if an object is of a primitive type using the instanceof operator Solving: Remove instanceof operator; or Replace the primitive type by its object-oriented equivalent type	Error	invalid_instanceof
83c	Message: Incompatible conditional operand types type-name-1 and type-name-2 Cause: When you are testing expression typing with instanceof, the types of the operands are not compatible. It means that the values of the operands cannot be compared. Therefore, the instanceof operator becomes useless Solving: Remove the instanceof operator; or Rewrite the instanceof expression to have compatible types for both operands	Error	invalid_instanceof
84a	Message: ‘name’ is not allowed as member name Cause: Name is reserved by the SARL compiler. They cannot be used for naming your type members Solving: Change the name of your type member	Error	invalid_member_name
84b	Message: Invalid action name ‘name’. You must not give to an action a name with reserved characters Cause: You have defined an name for an action/function/method that contains forbidden characters. The major forbidden character is $. It is not allowed to use it inside a name, even if it is allowed into the Java specification Solving: Rename your action	Error	invalid_member_name
84c	Message: Invalid character ‘value’ in a member name Cause: The member name contains the reserved character, usually $. This character is used by the SARL compiler for naming hidden features and it is forbidden to the SARL developers to use this character in her/his feature names to avoid any collision with the SARL internal features Solving: Remove the dollar character value from the member name	Error	invalid_member_name
84d	Message: The nested type type-name cannot hide an enclosing type Cause: You have define an inner type with a name. One of the enclosing types has also the same name. It is forbidden because it hides the features of the enclosing type from the inner type Solving: Rename your inner type	Error	invalid_member_name
85a	Message: Abstract method member-name cannot be final Cause: It is forbidden to declare a function abstract and final at the same time. Indeed, a final function disables the function overriding, and an abstract function must be always overridden Solving: Remove one of the two modifiers	Error	invalid_modifier
85b	Message: Abstract method member-name cannot be private Cause: It is forbidden to declare a function abstract and private at the same time. Indeed, a private function cannot be overridden because it is not visible, and an abstract function must be always overridden Solving: Remove one of the two modifiers	Error	invalid_modifier
85c	Message: Abstract method member-name cannot be static Cause: It is forbidden to declare a function abstract and static at the same time. Indeed, a static function cannot be overridden, and an abstract function must be always overridden Solving: Remove one of the two modifiers	Error	invalid_modifier
85d	Message: Duplicate modifier for the name Cause: Duplicate modifiers are not allowed Solving: Remove the duplicate modifier	Error	invalid_modifier
85e	Message: Illegal modifier for the feature; only list-of-modifiers are permitted Cause: You have used a modifier that is not allowed. The list-of-modifiers shows you the valid modifiers at the place of the issue Solving: Remove the modifier	Error	invalid_modifier
85f	Message: Method member-name with a body cannot be abstract Cause: An abstract function is by definition a function without a body Solving: Remove the abstract modifier; or remove the block of code	Error	invalid_modifier
85g	Message: Native methods do not specify a body Cause: A native function is always implemented by a very-low level library, usually written in C programming language. You cannot provide a block of code for a native function Solving: Remove the native modifier; or remove the block of code	Error	invalid_modifier
85h	Message: The member-name can either be abstract or final, not both Cause: It is forbidden to declare a function abstract and final at the same time. Indeed, a final function disables the function overriding, and an abstract function must be always overridden Solving: Remove one of the two modifiers	Error	invalid_modifier
85i	Message: The member-name can either be abstract or static, not both Cause: It is forbidden to declare a function abstract and static at the same time. Indeed, a static function cannot be overridden, and an abstract function must be always overridden Solving: Remove one of the two modifiers	Error	invalid_modifier
85j	Message: The member-name can either be var or val / final, not both Cause: var modifier is for declared a modifiable variable. val modifier (or final val) is for declaring a unmodifiable variable. You cannot use var and val at the same time Solving: Remove one of the two modifiers	Error	invalid_modifier
85k	Message: The member-name can only set one of modifiers Cause: You cannot specify more than one visibility modifier at a time Solving: Select and use one of the visibility modifiers	Error	invalid_modifier
85l	Message: The field name can be either final or volatile, not both Cause: It is forbidden to declare a field with the both modifiers at the same time. A final field does not need synchronization, that is provided by volatile Solving: Remove one of the two modifiers	Error	invalid_modifier
86a	Message: The type-name-1 is already covered by the caught type-name-2 Cause: You have specified multiple types, including type-name-1 and type-name-2, into a multi-catch statement. The type-name-1 is redundant because it is a sub-type of type-name-2 Solving: Remove type-name-1	Error	invalid_multitype_part
86b	Message: The caught type-name is redundant Cause: You have specified multiple types, including type-name, into a multi-catch statement. The type-name is specified more than one time. You must not specify a type more than one time Solving: Remove one occurrence of type-name	Error	invalid_multitype_part
87	Message: Cannot expression refer to the non-final variable var-name inside a lambda expression Cause: You have written an expression inside a closure/lambda expression that is referring a variable that is not marked as final. In this case, the state of the variable becomes unpredictable for the internal class that is supporting the lambda expression implementation (due to the targeting to Java). That’s why only final (or quasi-final) variables could be used in lambda expressions Solving: Replace var definition of the variable by a var definition; or Use another final variable from the lambda expression	Error	invalid_mutable_variable_access
88a	Message: Nested agents are not allowed inside enclosing-type Cause: It is not allowed by the SARL language’s syntax to define an agent inside another type declaration, named enclosing-type Solving: Move the agent definition outside the enclosing type	Error	invalid_nested_definition
88b	Message: Nested behaviors are not allowed inside enclosing-type Cause: It is not allowed by the SARL language’s syntax to define a behavior inside another type declaration, named enclosing-type Solving: Move the behavior definition outside the enclosing type	Error	invalid_nested_definition
88c	Message: Nested capacities are not allowed inside enclosing-type Cause: It is not allowed by the SARL language’s syntax to define a capacity inside another type declaration, named enclosing-type Solving: Move the capacity definition outside the enclosing type	Error	invalid_nested_definition
88d	Message: Nested events are not allowed inside enclosing-type Cause: It is not allowed by the SARL language’s syntax to define an event inside another type declaration, named enclosing-type Solving: Move the event definition outside the enclosing type	Error	invalid_nested_definition
88e	Message: Nested skills are not allowed inside enclosing-type Cause: It is not allowed by the SARL language’s syntax to define a skill inside another type declaration, named enclosing-type Solving: Move the capacity definition outside the enclosing type	Error	invalid_nested_definition
89a	Message: Invalid number of arguments. The feature-type feature-prototype is not applicable for the arguments list-of-arguments Cause: You are calling a feature (method or constructor) with a list-of-arguments. But, the called feature required a different number of arguments Solving: Call the feature with the correct number of arguments	Error	invalid_number_of_arguments
89b	Message: Invalid number of arguments. The feature-type feature-prototype is not applicable without arguments Cause: You are calling a feature (method or constructor) without arguments. But, the called feature required to have arguments Solving: Add arguments into your calling expression	Error	invalid_number_of_arguments
90a	Message: Incorrect number of arguments for type type-name ; it cannot be parameterized with arguments type-arguments Cause: You are referencing a type with a list of generic type arguments (list-arguments). But, the referenced type required a different number of generic type arguments Solving: Reference the type with the correct number of arguments	Error	invalid_number_of_type_arguments
90b	Message: Invalid number of type arguments. The feature-type feature-name is not applicable for the type arguments type-arguments Cause: You are calling a feature (method or constructor) with a list of generic type arguments (list-arguments). But, the feature required a different number of generic type arguments Solving: Call the feature with the correct number of arguments	Error	invalid_number_of_type_arguments
91a	Message: Invalid use of the unmodifiable feature ‘name’. You cannot use ‘name’ as the operand of a postfix operator because it causes a side effect Cause: Several SARL constructs must be considered as read-only, such as occurrence that represents the current instance of the just-received event within a behavior unit. In this example, it is assumed within the SARL operational semantics that the occurrence is an unmodifiable event in order to ensure consistency between the different behavior units that handle the occurrence. This error message is generated when you try to change the value of occurrence with a postfix operator, e.g., ++, that is forbidden	Error	invalid_occurrence_readonly_use
91b	Message: Invalid use of the unmodifiable feature ‘name’. You cannot use ‘name’ at the left-side of an assignment operator Cause: The keyword with the name is considered as a read-only construct. Usually it is occurrence that represents the current instance of the just-received event within a behavior unit. It is assumed within the SARL operational semantics that occurrence instance is an unmodifiable event in order to ensure consistency between the different behavior units that handle the occurrence. This error message is generated when you try to assign a value to an occurrence, that is forbidden	Error	invalid_occurrence_readonly_use
92	Message: Incompatible operand types left and right Cause: When you are testing expression equality with ===, the types of the operands are not compatible. It means that the values of the operands cannot be compared Solving: Rewrite your code in order to have compatible types for both operands	Error	invalid_operand_types
93a	Message: The binary operator ‘name’ allows at most two arguments Cause: You try to use the operator name with zero or one operand; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93b	Message: The binary operator ‘name’ requires at least one argument Cause: You try to use the operator name with zero operand; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93c	Message: The operator ‘name’ allows at most two arguments Cause: You try to use the operator name with more than two operands; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93d	Message: The static binary operator ‘name’ requires exactly two arguments Cause: You try to use the operator name with zero or one operand; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93e	Message: The static operator ‘name’ allows at most two arguments Cause: You try to use the operator name without operand, when it requires at least one Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93f	Message: The static operator ‘name’ requires at least one argument Cause: You try to use the operator name without argument, when it requires at least one Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93g	Message: The static unary operator ‘name’ requires exactly one argument Cause: You try to use the operator name with a number of operand that is not equal to 1; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
93h	Message: The unary operator ‘name’ allows at most one argument Cause: You try to use the operator name with more than 1 operand; that is not allowed Solving: Rewrite the expression with the failing operator	Configurable; Default is: Error	invalid_operator_signature
94a	Message: Invalid return inside throw Cause: It is forbidden to specify a return statement into a throw expression because the outer early-exit point (throw) could be never reached due to the execution of the inner early-exit point (return). It is inconsistent to do a regular return for a function inside the expression of an exceptional exit from the same function Solving: Remove return from the throw expression	Error	invalid_return
94b	Message: Invalid return’s expression Cause: SARL compiler infers that the type of the expression after a return statement is of type void. It is impossible to return “nothing” when a value is expected Solving: Change the return expression in order to compute a value of the appropriate type	Error	invalid_return
94c	Message: Return cannot be nested Cause: It is forbidden to specify a return statement into another return expression because the outer early-exit point could be never reached due to the execution of the inner early-exit point. It is inconsistent to do a return for a function inside the expression that computes another value to be returned from the same function Solving: Remove the inner return from the outer return expression	Error	invalid_return
94d	Message: The function must return a result of type type-name Cause: An incompatibility between the type of the expression after a return statement and those of the return value of the enclosing function is detected. Both types must be compatible, i.e., the type of the expression after the return statement must be equal to or a sub-type of the function’s return type Solving: Update the expression of the return statement to have an appropriate type	Error	invalid_return
94e	Message: Void functions cannot return a value Cause: You are specifying a return statement with an expression inside a procedure, i.e. a function returning “nothing”. Is it inconsistent to compute a value to be returned while the function does not return it Solving: Remove the expression from the return statement	Error	invalid_return
95	Message: Incompatible SARL library on the classpath. Actual: actual-version. Expected: expected-version Cause: The SARL library found on the classpath (actual-version) is not compatible with the compiler’s version (expected-version) Solving: Reconfigure your project to have the SARL libraries with expected-version into the classpath	Error	invalid_sarl_lib_on_classpath
96	Message: Cannot call super of an anonymous class from a lambda expression Cause: A closure/lambda expression is implemented by an anonymous class at the background, i.e. Java. You try to use the super statement that represents the instance viewed as the super-type of the associated anonymous class. However, it is forbidden to use super because the closure/lambda expression hides the background implementation, inclusing super Solving: Remove super	Error	invalid_super_call
97	Message: The resource ‘var-name’ of type type-name does not implement java.lang.AutoCloseable Cause: The try-with-resource statement enables you to automatically close an opened resource (file, socket, etc.). The given resource, named var-named must implement the interface AutoCloseable in order to be able to be automatically closed. This constraint comes from the Java underground API Solving: Change the resource by using one that is auto-closeable	Error	invalid_try_resource_type
98a	Message: ‘void[]’ is not a valid type Cause: This error is generated when you are specifying a type literal representing an array of void, e.g. void[] or void[][]. An array of void cannot be created in memory. It is therefore impossible to specify this type with a type literal Solving: Replace void by and appropriate type	Error	invalid_type
98b	Message: Undefined type for the default value of the formal parameter name Cause: The type of the default for the formal parameter with the given name cannot be infered by the SARL compiler Solving: Change the default value’s expression in order to make its type inferable	Error	invalid_type
98c	Message: Undefined type for the formal parameter name Cause: A type specification is missed for the formal parameter with the given name Solving: Add a type to the formal parameter	Error	invalid_type
99a	Message: Invalid type argument. Type arguments cannot be applied to the type literal name Cause: You have specified a generic type argument into a type literal such as typeof; that is invalid. For example, typeof(Collection) is valid; but typeof(Collection<String>) is not Solving: Remove the generic type argument	Error	invalid_type_arguments_on_type_literal
99b	Message: Invalid type arguments. Type arguments cannot be applied to the type literal name Cause: You have specified generic type arguments into a type literal such as typeof; that is invalid. For example, typeof(Collection) is valid; but typeof(Collection<String, Integer>) is not Solving: x	Error	invalid_type_arguments_on_type_literal
100a	Message: The array type type-name cannot be used as a type parameter bound Cause: It is forbidden to use an array type into the generic type bounds, e.g. <? extends Integer[]> Solving: Replace the array into the generic bounds by an appropriate type	Error	invalid_type_parameter_bounds
100b	Message: The type parameter %name% cannot be used as a type parameter bound with additional bounds Cause: If you put a generic type paramater as bounds of another generic type parameter, it is forbidden to add more bounding constraints. For example, <A, B extends A> is valid. But, <A, B extends A & Cloneable> is invalid Solving: Remove the additional bounding constraint	Error	invalid_type_parameter_bounds
101	Message: Invalid use of the name keyword. It could only be used inside loops Cause: break and continue statements enable to stop the execution of a loop step by continuing the execution after the loop itself or at the next loop step, respectively. The keyword with name is not supposed to be used outside a loop expression Solving: Remove the break statement	Error	invalid_use_of_loop_breaking_keyword
102a	Message: Create methods can not be static Cause: Creation method is inspired from the factory-method design pattern. It cannot be defined with the static modifier Solving: Remove the static modifier	Error	invalid_use_of_static
102b	Message: Create methods can not have type parameters Cause: Creation method is inspired from the factory-method design pattern. It cannot have generic type parameters Solving: Remove the generic type parameters	Error	invalid_use_of_static
103a	Message: Cannot perform instanceof check against type parameter name. Use its erasure erasure-name instead since further generic type information will be erased at runtime Cause: You specify a generic type parameter as the right operand of an instanceof, e.g. x instanceof T. Since there is no keept information about the generic types at runtime, the instanceof operator cannot proceed. The erasure-name is the base definition of name related to its bounds Solving: Replace name by erasure-name	Error	invalid_use_of_type_parameter
103b	Message: Cannot perform type switch against type parameter name. Use its erasure Object instead since further generic type information will be erased at runtime Cause: You specify a generic type parameter as the type guard of a case, e.g. T case 1. Since there is no keept information about the generic types at runtime, the case statement cannot filter according to the type of the value. It is therefore recommended to use Object as the type guard Solving: Remove the type guard	Error	invalid_use_of_type_parameter
103c	Message: Illegal class literal for the type parameter name Cause: You specify a generic type parameter as a type literal, e.g. typeof(T). Since there is no keept information about the generic types at runtime, the typeof operator cannot reply the class at runtime Solving: Replace name by an appropriate type from the erasure of name	Error	invalid_use_of_type_parameter
104a	Message: A vararg may not be an extension Cause: By definition a variadic parameter, e.g., a : int* is a kind of list of argument values. Since the extension mechanism is associated to a single instance of object, and the variadic parameter may contains more than one, there is an incompatibility between the variadic parameter and the extension mechanism Solving: Remove the keyword extension to the variadic parameter	Error	invalid_use_of_varArg
104b	Message: A vararg must be the last parameter Cause: By definition a variadic parameter, e.g., a : int*, must be the last formal parameter of a function Solving: Move the variadic parameter at the last position in the list of the formal parameters	Error	invalid_use_of_varArg
105a	Message: Create method name may not declare return type void Cause: Create method is defined as a design pattern for creating objects in memory. By design, they are supposed to return the created object and not void Solving: Replace the void return type by the type of the created object	Error	invalid_use_of_void
105b	Message: Primitive void cannot be used here Cause: This message is generated in to cases. a) Generic type argument: it is forbidden to put primitive void as generic type arguments, e.g. Collection<void>. b) Guard type into a switch case: it is forbidden to put primitive void as guard type, e.g. void case 1 Solving: Replace void by its appropriate equivalent class	Error	invalid_use_of_void
105c	Message: Primitives are not allowed as type guards Cause: It is forbidden to put primitive type as guard type, e.g. int case 1 Solving: Replace the primitive type by its appropriate equivalent class	Error	invalid_use_of_void
105d	Message: Primitives cannot be used as type arguments Cause: It is forbidden to put primitive types as generic type arguments, e.g. Collection<int>. You must use only classes as generic type arguments, e.g. Collection<Integer> Solving: Replace the primitive type by its appropriate equivalent class	Error	invalid_use_of_void
105e	Message: The inherited return type void of name is invalid for create method Cause: Create method is defined as a design pattern for creating objects in memory. By design, they are supposed to return the created object and not void Solving: Replace the void return type by the type of the created object	Error	invalid_use_of_void
105f	Message: The primitive ‘void’ cannot be the type of a function parameter Cause: This error is generated when a reference to a function, a.k.a. as pointer to a function, is specified with a void type. A function has parameters and returns values. It is not void Solving: Replace void by an appropriate pointer to a function	Error	invalid_use_of_void
105g	Message: The primitive ‘void’ cannot be the type of a parameter Cause: A formal parameter must have a type. Consequently, void cannot be specified as the type of a formal parameter Solving: Replace void by an appropriate type	Error	invalid_use_of_void
105h	Message: The primitive type cannot be a type argument Cause: It is forbidden to put primitive types as generic type parameters, e.g. Collection<int>. You must use only classes as generic type parameters, e.g. Collection<Integer> Solving: Replace the primitive type by its appropriate equivalent class	Error	invalid_use_of_void
105i	Message: void is an invalid type for the create method func-prototype Cause: Create method is defined as a design pattern for creating objects in memory. By design, they are supposed to return the created object and not void Solving: Replace the void return type by the type of the created object	Error	invalid_use_of_void
105j	Message: void is an invalid type for the variable name Cause: Since a variable is supposed to contain a value, it is important to specify the size of memory that is occupied bythe variable. This specification is done by giving a type to the variable. void is not a valid type in this context Solving: Replace void by an appropriate type	Error	invalid_use_of_void
106	Message: Wildcard types are not allowed in this context Cause: It is forbidden to put wildcard as generic type parameters, e.g. Collection<?>. You must use only classes as generic type parameters, e.g. Collection<Integer> Solving: Replace the wildcard by an appropriate class	Error	invalid_use_of_wild_card
107a	Message: Invalid type constraint. Cannot use multiple lower bounds in wildcards Cause: Inside a type reference, you have specified a type constraints with too much lower bounds, e.g. new MyType<? super Number &amp; CharSequence>. Currently, SARL does not support multiple lower bounds into the generic type references Solving: Modify the bounds to have maximum one lower bound	Error	invalid_wildcard_constraints
107b	Message: Invalid type constraint. Cannot use multiple upper bounds in wildcards Cause: Inside a type reference, you have specified a type constraints with too much upper bounds, e.g. new MyType<? extends Number &amp; CharSequence>. Currently, SARL does not support multiple upper bounds into the generic type references Solving: Modify the bounds to have maximum one upper bound	Error	invalid_wildcard_constraints
108	Message: Invalid number format: explaination Cause: A number literal has not a valid syntax Solving: Change the number literal to fullfil the number syntax	Error	invalidNumberFormat
109a	Message: Cannot access the private feature in a subclass context Cause: You try to access to a field that is declared as private into the super-type	Error	invisible_feature
109b	Message: The field feature is not visible Cause: You try to access to a field that is declared as private into its enclosing type	Error	invisible_feature
109c	Message: The method feature is not visible Cause: You try to access to a method that is declared as private into its enclosing type	Error	invisible_feature
110	Message: sarlDoc: type-ref cannot be resolved to a type Cause: A hyperlink to a type into the Javadoc points to an unknown type named type-ref Solving: Change the type-name Delegated to: org.eclipse.jdt.core.compiler.problem.invalidJavadoc	Delegated; Default is: Ignored	java_doc_linking
111	Message: Use ‘as’ keyword for type casting Cause: SARL has detected possible improper usage of the parentheses, i.e., a type reference enclosed by parentheses is found. This syntax is well known is other programming languages such as Java or C++, as the casting operator. However, the casting operator in SARL is as. For example, this error is detected when you starts a code block with the improper syntax, e.g. {(Integer) 1} Solving: Replace the Java-like casting operator by as	Configurable; Default is: Error	java_style_type_cast
112a	Message: Couldn’t find a valid version of the JDK in the classpath. The generator configuration specifies the version current-version. Please change the configuration in order to use a version greater than or equal to min-version AND strictly lower than max-version Cause: SARL needs a specific version of the Java Development Kit (JDK) in order to be executed. The current-version of the JDK that is used for compiling your SARL project is not compatible with SARL. It is recommended to use a JDK version between min-version (inclusive) and max-version (exclusive) Solving: Change the configuration of your SARL project for using an appropriate JDK version	Error	jdk_not_on_classpath
112b	Message: SARL compiler couldn’t be executed on the JDK version current-version. Please use the JDK greater than or equal to min-version AND strictly lower than max-version Cause: SARL needs a specific version of the Java Development Kit (JDK) in order to be executed. The current-version of the JDK is not compatible with SARL. It is recommended to use a JDK version between min-version (inclusive) and max-version (exclusive) Solving: Run SARL with an appropriate JDK version	Error	jdk_not_on_classpath
113	Message: Left-hand side of an assignment must be an variable Cause: The left operand of the assignment operator = must be a variable (local, field, or indirect)	Error	left_hand_side_must_be_variable
114a	Message: name cannot be resolved to a type Cause: You have specified a type name into your code, e.g. typeof(MyType). But, no type declaration was found for name into the current compilation scope Solving: Replace name by an appropriate type name; or Add the type name into the compilation scope, by using an import statement for example	Error	Linking
114b	Message: Couldn’t resolve reference to name Cause: You have written a reference to a feature that cannot be found from the current compilation scope. Since, it cannot be found, SARL compiler cannot determine the concrete type of the feature Solving: Replace name by an appropriate feature; or Add the feature into the compilation scope, by using an import statement for example	Error	Linking
114c	Message: The method func-prototype is undefined Cause: You have specified a function call to func-prototype into your code, e.g. myfct(). But, no method declaration was found for func-prototype into the current compilation scope Solving: Replace func-prototype by an appropriate function call; or Add the method into the compilation scope, by using an import statement for example	Error	Linking
114d	Message: The method func-prototype is undefined for the type type-name Cause: You have specified a function call to func-prototype into your code, e.g. myfct(). But, no method declaration was found for func-prototype into the current compilation scope Solving: Replace func-prototype by an appropriate function call; or Add the method into the compilation scope, by using an import statement for example	Error	Linking
114e	Message: The method or field name is undefined Cause: You have specified a function call to name, or a reference to the field name, into your code. But, neither a method declaration nor a field declaration was found into the current compilation scope Solving: Replace name by an appropriate function call or field reference; or Add the method/field into the compilation scope, by using an import statement for example	Error	Linking
114f	Message: The method or field name is undefined for the type type-name Cause: You have specified a function call to name, or a reference to the field name, into your code. But, neither a method declaration nor a field declaration was found into the current compilation scope Solving: Replace name by an appropriate function call or field reference; or Add the method/field into the compilation scope, by using an import statement for example	Error	Linking
115	Message: Cannot access the type-name feature-name with parentheses Cause: This error is generated when you try to access to a local variable with parentheses. Let be the local variable x defined. The code x() causes this error because x is a variable, not a method Solving: Remove the parentheses	Error	local_var_access_with_parentheses
116	Message: Discouraged manual definition of an inline expression. Inline expression definition is reserved for advanced usage Cause: The @Inline annotation enables the SARL compiler to replace the call to the annotated function by the expression specified inside the annotation. It may be useful for making faster the generated Java code. However, the expression inside @Inline must be written in valid Java and following strict inlining rules. That’s why, the explicit usage of @Inline is not recommended, except to advanced SARL developers Solving: Remove the @Inline annotation	Configurable; Default is: Warning	manual_inline_definition
117a	Message: The abstract method func-name in type type-name can only be defined by an abstract class Cause: An abstract method/function is a function without block of code. The keyword abstract could be missed on a function only if the enclosing type is defined as abstract too Solving: Add the modifier abstract into the prototype of func-name	Error	missing_abstract
117b	Message: The method func-name in type type-name should be declared abstract Cause: An abstract method/function is a function without block of code. The keyword abstract could be missed but it is a good practice to specify it explicitle. This warning is generated to notify you that an abstract is missed and may be added to the function prototype Solving: Add the modifier abstract into the prototype of func-name	Warning	missing_abstract
118	Message: The abstract method func-prototype in type type-name can only be defined by an abstract class Cause: It is forbidden to define an abstract function into an anonymous class Solving: Add block of code for the function with prototype func-prototype	Error	missing_abstract_in_anonymous
119	Message: The class ‘name’ is not declared abstract Cause: The name of the class starts with the word Abstract, and the class has not the abstract modifier. Because the term “abstract” is part of the name of the class, it is a good practice to declare the class as abstract Solving: Add abstract modifier to the class; or remove “Abstract” from name	Configurable; Default is: Warning	missing_abstract_modifier
120	Message: The annotation must define the attribute ‘name‘ Cause: An annotation needs to have a specified value. This error message is generated when no value is specified into the annotation Solving: Add a value to the annotation	Error	missing_attribute_definition
121	Message: Missing code for a static constructor Cause: A static constructor could be defined for initializing the static fields of a type. It is forbidden to define a static constructor without a block of code Solving: Add a block of code to the static constructor	Error	missing_body
122	Message: No default constructor in super type other-type. type-name must define an explicit constructor Cause: You have define a type named type-name with a default constructor. But, the super-class does not have a default constructor. It is then impossible for your implicit default constructor to invoke a default constructor from the super-class. You must define explicitly your own constructor. This issue should never occur because the constructors from the super type are inherited when there is no explicit constructor defined	Error	missing_constructor
123	Message: Value must be initialized Cause: Final variables, a.k.a. value, could be declared with val, and must be initialized when they are declared. You have declared a final variable that is never initialized Solving: Add initialization value to the final variable	Error	missing_initialization
124	Message: The method func-prototype of type type-name should use override keyword since it actually overrides a supertype method Cause: A function with the prototype func-prototype is defined into the type type-name. The same function prototype is defined into and inherited from a super-type. A good practice is to replace the def keyword by override in order to make explicit the fact that the function into type-name overrides another function	Configurable; Default is: Ignored	missing_override
125	Message: Nested classes must be static Cause: SARL specification forces to have static inner classes due to implementation of Xtext/Xtend Solving: Add static modifier to the nested class	Error	missing_static_modifier
126	Message: The overridden method is synchronized, the current one is not synchronized Cause: According the inheritance definition, that is common to SARL and the object-oriented programming languages, overridable functions as associated to a contract with their callers. This contract indicates that the prototype of the function will never changed, and the function will have the same modifiers always. This contract must be fullfil by the overriding functions. This warning message is generated when your overriding function has not the synchronized modifier, and the inherited function has the synchronized modifier. It is a good practice to exhibit the same modifiers as the inherited function Solving: Add synchronized modifier to your function	Error	missing_synchronized
127a	Message: Missing implemented type ‘type-name-1’ for ‘type-name-2‘ Cause: SARL detects for the declaration of the type named type-name-2 that an implementation specification after implements is missed. The expected implementation must be a type that is equal to or a sub-type of the type named type-named-1 Solving: Add an appropriate implemented type	Error	missing_type
127b	Message: Type cannot be derived Cause: Within a variable declaration with var or val, no type was specified. SARL was failed to infer the type of the variable, notably because an initialization expression is missed for the variable. Because a variable must have a type, it is forbidden to let the variable type free Solving: Add an explicit type to the variable, or Add an initialization expression for the variable	Error	missing_type
128	Message: Multiple annotations of non-repeatable type @name. Only annotation types marked @Repeatable can be used multiple times at one target Cause: By definition, an annotation could be attached multiple times to an element only if it is declared as repeatable with the @Repeatable annotation. This issue message is generated when the annotation with the given name is attached multiple times to an element, and the annotation @Repeatable is not attached to the declaration of the annotation with the given name	Error	multiple_annotations_used
129	Message: No default constructor in super type type-name. Another constructor must be invoked explicitly Cause: You have define a type extending the type type-name and with an explicit constructor. Inside the code of this explicit constructor, you call the default constructor (implicitly or explicitly). But, the super-type does not have a default constructor Solving: Update you constructor code in order to invoke a constructor of the super-type	Error	must_invoke_super_constructor
130	Message: The attribute value is undefined for the annotation type name Cause: You are trying to provide a value to an annotation, but the field value is not defined into the annotation. This error may occur when you write @MyAnnotion("value") with a definition of MyAnnotation without a field named value. In this example, assuming that the declared field is named myfield, the correct notation is @MyAnnotation(myfield = "value"). As for other languages as Java, SARL assumes that if the name of the attribute is not provided, the default attribute name is value Solving: Add the name of the attribute before the value	Error	no_attribute_value
131a	Message: No enclosing instance of the type name is accessible in scope Cause: You are referencing a feature within the type type that is defined non-statically. But, these is no accessible instance of the type name within the enclosing types. The following example is a typical example for this error: class A {   def f : void {}   static class B {     def g : void {       f     }   } } The reference to f causes this error because the instance of A is inaccessible from B due to its static declaration	Error	no_enclosing_instance_available
131b	Message: The enclosing type does not extend or implement the interface name Cause: Your are calling a feature (method or field) from the super-type by using the syntax super.feature. The super-type does not implement the interface name that is required to access to the specified feature	Error	no_enclosing_instance_available
132	Message: The value for an annotation attribute must be a constant expression Cause: It is forbidden to give a value to an annotation that is not a constant expression, i.e., an expression without variable reference, function calls, etc Solving: Rewrite the value expression to have only constant features inside	Error	no_illegal_value
133	Message: Cannot use null-safe feature call on primitive receiver Cause: Null-safe call of an method, e.g. obj?.feature, enables you to test the nullity of an object before calling a feature on it. But, you have applied the null-safe call on a primitive type variable, i.e. obj is of primitive type. This is impossible because a primitive variable does not contain an object Solving: Remove the null-safe operator	Error	null_safe_feature_call_on_primitive
134	Message: Null-safe call of primitive-valued feature feature-name, default value value will be used Cause: This issue message is generated when a null-safe test is used for computing a primitive-type value. For example, the code list?.isEmpty explicitly replies the value of isEmpty if the list is not null. But when list is null, nothing indicates what could be the boolean value to give. SARL compiler assumes the default value for the primitive type, e.g. false for boolean. This issue message is also generated when your are using an incomplete if-then statement, e.g. var b = if (condition) true. There is no else, so that the default value for the primitive type is assumed if the condition is evaluated to false Solving: Update your code to have a complete coverage of the cases	Configurable; Default is: Warning	null_safe_feature_call_on_primitive_valued_feature
135	Message: Superfluous @Override annotation Cause: From JAva language API, the annotation @Override is defined in order to mark a function as a function that is overridding another function. The usage of this annotation is not recommended, even it is still possible. This warning message is generated when the function is already defined with the override keyword, and annotated with @Override. In this case, the annotation is superfluous Solving: Remove @Override	Warning	obsolete_annotation_override
136	Message: Unnecessary cast from type-name-1 to type-name-2 Cause: You are using a cast operator as. But, the type of the left-operand expression is already compatible with the specified type as right operand. In other words, it is not necessary to cast explicitly the left expression to the right type Solving: Remove as operator Delegated to: org.eclipse.jdt.core.compiler.problem.unnecessaryTypeCheck	Delegated; Default is: Warning	obsolete_cast
137	Message: The expression of type type-name-1 is already of type type-name-2 Cause: You are using instanceof. But, the type of the left-operand expression is already compatible with the specified type as right operand. In other words, it is not necessary to test the type of the expression again the type; or the instanceof operator is always evaluated to true Solving: Remove instanceof operator, and any “else” statement that is associated with the operator Delegated to: org.eclipse.jdt.core.compiler.problem.unnecessaryTypeCheck	Delegated; Default is: Warning	obsolete_instanceof
138a	Message: The method func-prototype of type type-name must override a superclass method Cause: You have used the keyword override for declaring the function with prototype func-prototype. Since the function in type-name is not overriding a function from the super type with the same erasure, but this latter does not exist Solving: Replace override by def	Error	obsolete_override
138b	Message: The method func-prototype of type type-name shadows the method other-prototype of type other-type, but does not override it Cause: You have used the keyword override for declaring the function with prototype func-prototype. Since the function in type-name is not overriding a function from other-type with the same erasure, but with differences into the prototype such that your function is hidding the function of other-type. You function should be defined with def instead of overrride Solving: Replace override by def	Error	obsolete_override
139a	Message: Constructor call without parentheses Cause: This error message is generated when a constructor is defined without a formal parameter, e.g. new (), and this constructor is called without parentheses, e.g. this. In several programming standards, it is considered as a good practice to write the parentheses for each constructor call, even if there is no argument to pass to Solving: Add ()	Configurable; Default is: Ignored	operation_without_parentheses
139b	Message: Method call without parentheses Cause: This error message is generated when a function is defined without a formal parameter, e.g. def fct(), and this function is called without parentheses, e.g. fct. In several programming standards, it is considered as a good practice to write the parentheses for each method call, even if there is no argument to pass to Solving: Add ()	Configurable; Default is: Ignored	operation_without_parentheses
140a	Message: Attempt to override final class Cause: You define a class that is extending another class. But, the super class was defined as not extendable, with the final modifier. You cannot extend a class that is not extendable Solving: Change the super-type	Error	overridden_final
140b	Message: Attempt to override final method func-prototype Cause: You define a function with the given prototype func-prototype that is overriding an inherited function. But, the inherited function was defined as not overridable, with the final modifier. You cannot override a function that is not overridable Solving: Remove your function	Error	overridden_final
141a	Message: Cannot reduce the visibility of the overridden method name Cause: According the inheritance definition, that is common to SARL and the object-oriented programming languages, overridable functions as associated to a contract with their callers. This contract indicates that the prototype of the function will never changed, and the function will have the same accessibility/visibility always. This contract must be fullfil by the overriding functions. This error message is generated when your overriding function has a visibility lower than the visibility of the inherited function Solving: Change the visibility of your function by moving up at least to the same visibility as the inherited function	Error	override_reduces_visibility
141b	Message: Synthetic dispatch method reduces visibility of overridden method name Cause: According the inheritance definition, that is common to SARL and the object-oriented programming languages, overridable functions as associated to a contract with their callers. This contract indicates that the prototype of the function will never changed, and the function will have the same accessibility/visibility always. This contract must be fullfil by the overriding functions. This error message is generated when your overriding function has a visibility lower than the visibility of the inherited function Solving: Change the visibility of your function by moving up at least to the same visibility as the inherited function	Error	override_reduces_visibility
142	Message: Redundant definition of the default value for the formal parameter name Cause: This warning message is generated when you declared a default value for a formal parameter that has already a default value declared into one of the super types. It is not necessary to redefine the same default value for the formal parameter Solving: Remove the redundant declaration fo the default value	Configurable; Default is: Warning	parameter_default_value_redefinition
143	Message: The field field-name should be synchronized for avoiding value inconsistency due to parallel execution Cause: Within the SARL operational semantic, a SARL program is executed in parallel, i.e., all the behavior units and the individual agent tasks are executed in different threaded tasks. Due to this run-time principle, the access to the fields within the scope of an agent (agent, behavior, skill) must be considered carefully. This issue code is generated by the compiler in order to notify the SARL developer that a synchronization issue may occur on the field named field-name. In this case, the SARL compiler cannot infer a default synchronization policy, it is recommended to the SARL developer to implement explicitly a synchronization method Solving: Put the field access into a synchronization block	Configurable; Default is: Warning	potential_field_synchronization_problem
144a	Message: Potential inefficient value conversion. This operation is based on a call to the function ‘func-name’, which generates a value of type ‘origin-type’ that is converted on-the-fly to ‘target-type‘ Cause: When the as casting operator is used, SARL compiler infers the best method to convert the origin expression of type origin-type to the target target-type. The possible methods are: 1) Direct low-level cast that is natively supported by the virtual machine. 2) If target-type is a primitive type, find a function named “target-typeValue()” within the current scope. 3) If target-type is not a primitive type, find a function named “totarget-type()” within the current scope. If none of these cases fits, an cast error is generated. However, the cases 2 and 3 means that a cast operator will be supported by a call to func-name function. Depending on the implementation of func-name, the call may be inefficient at run-time	Configurable; Default is: Warning	potential_inefficient_value_conversion
144b	Message: Potential inefficient value conversion. This operation is based on a call to the function ‘func-name’, which may cause inefficient code execution Cause: When the as casting operator is used, SARL compiler infers the best method to convert the origin expression to a target type. The possible methods are: 1) Direct low-level cast that is natively supported by the virtual machine. 2) If the target type is a primitive type, find a function named “type-nameValue()” within the current scope. 3) If the target type is not a primitive type, find a function named “totype-name()” within the current scope. If none of these cases fits, an cast error is generated. However, the cases 2 and 3 means that a cast operator will be supported by a call to a function. Depending on the implementation of the called function, the call may be inefficient at run-time	Configurable; Default is: Warning	potential_inefficient_value_conversion
145	Message: Potential problem of data sharing outside the control of the agent. The field ‘name’ is declared with the static modifier. It enables the code to change the field value outside a direct control of the agent; that is breaking partly the agent autonomy principle Cause: This warning message is generated when you declared a field with the static modifier into an agent or on of its components. Basically, a static field is defined outside an instance of agent or component. In other words, the static field could be used for sharing data between the components of the agents, and between the agents themselves. This method of data sharing is breaking the agent autonomy principle. It should be used only for sharing constant data between the agents Solving: Remove the static modifier	Configurable; Default is: Warning	potential_memory_sharing_outside_agent_control
146a	Message: The operator ‘name’ is undefined for the argument types type-name and null Cause: This error message is generated when an (in)equality test operator, i.e., ==, ===, != or !==, is invoked with the null literal as right operand, e.g. x == null, and the left operand being of primitive type. The problem is due to the usage of the keyword null that is not corresponding to a specific type. In this case, the SARL compiler cannot determine the best operator implementation Solving: Initialize to null a local variable with the expected type for the right operand, and use this local variable as right operand	Error	primitive_compared_to_null
146b	Message: The operator ‘name’ is undefined for the argument types null and type-name Cause: This error message is generated when an (in)equality test operator, i.e., ==, ===, != or !==, is invoked with the null literal as left operand, e.g. null == x, and the right operand being of primitive type. The problem is due to the usage of the keyword null that is not corresponding to a specific type. In this case, the SARL compiler cannot determine the best operator implementation Solving: Initialize to null a local variable with the expected type for the left operand, and use this local variable as left operand	Error	primitive_compared_to_null
146c	Message: The operator ‘?:’ is undefined for arguments of type type-name Cause: This error message may be generated when your are using the elvis operator, with a primitive type value as left operand and the null literal as right operand, e.g. x ?: null. The problem is due to the usage of the keyword null that is not corresponding to a specific type. In this case, the SARL compiler cannot determine the best operator implementation Solving: Initialize to null a local variable with the expected type for the right operand, and use this local variable as right operand	Error	primitive_compared_to_null
147	Message: any-message Cause: It is possible to generate issue messages when a feature is used or invoked from the SARL code. The specification of the issue message is done by using one of the annotations @ErrorOnCall, @WarningOnCall or @InfoOnCall that takes an message (any-message). This annotation is attached to the feature for which a call must generate the issue	Configurable; Default is: Error	programmatic_issue_annotation
148a	Message: expression uses the raw type name. References to generic type name should be parameterized Cause: The given expression is referencing a generic type with the given name without specifying its generic type arguments Solving: Add the missed generic type arguments	Configurable; Default is: Warning	raw_type
148b	Message: name is a raw type. References to generic type name should be parameterized Cause: You are referencing a generic type with the given name without specifying its generic type arguments Solving: Add the missed generic type arguments	Configurable; Default is: Warning	raw_type
149	Message: Redundant use of the capacity ‘capacity-name‘ Cause: The capacity named capacity-name is specified more than one time after a uses statement. It is not necessary to specify a capacity name multiple name, since the compiler has already activated the access to the capacity’s functions with the first occurrence of capacity-name Solving: Remove the redundant capacity-name from the uses statement	Error	redundant_capacity_use
150a	Message: Redundant case Cause: You have written a case without block of code that falls through the default case. It may be a piece of code like: switch (v) {   case 1, } It is clear that case 1 falls through a case that is not given. In this case, it is considered as an error because the fall-through cannot be implemented Solving: Remove the fall-through case; or add a block of code to the redundant case	Error	redundant_case
150b	Message: Redundant case Cause: You have written a case without block of code that falls through the default case. It may be a piece of code like: switch (v) {   case 1,   default: {} } It is clear that case 1 is redundant with default since this last is covering the 1 value Solving: Remove the redundant case	Warning	redundant_case
151a	Message: Duplicate implemented feature ‘interface-name‘ Cause: An interface, named interface-name, is implemented by a class. But, the interface with name interface-name is already implemented by the same class. It is not allowed by the SARL compiler to implement two time the same interface into a single class Solving: Remove the redundant interface-name	Error	redundant_interface_implementation
151b	Message: The feature ‘interface-name’ is already implemented by the super-type ‘type-name‘ Cause: This error may occur in two cases. First, the interface named interface-name is implemented by the current class. But, it is also implemented by one of the super classes, named type-name, or it is a super-interface, named type-name, of another implemented interface by the class. The current specification of the interface implementation becomes redundant and unnecessary. Second, the interface named interface-name is extended by the current interface. But, it is also defined as a super-interface for the super-interface named type-name. The current specification of the interface implementation becomes redundant and unnecessary Solving: Remove the redundant interface-name	Configurable; Default is: Warning	redundant_interface_implementation
152a	Message: The constructor constructor-prototype has an argument of void type Cause: One of the generic type arguments that is implicitly associated to the given constructor is specified as to be void or non-found into the classpath	Error	refer_invalid_types
152b	Message: The constructor constructor-prototype refers to the missing type name Cause: The given constructor is associated to a type that was not found into the classpath	Error	refer_invalid_types
152c	Message: The field field-name has an illegal argument type Cause: One of the generic type arguments that is implicitly associated to the field field-name is specified as to be void or non-found into the classpath	Error	refer_invalid_types
152d	Message: The field field-name refers to the missing type name Cause: The given field is associated to a type that was not found into the classpath. The non-found type may be the raw type of the field, or one of the generic type parameters	Error	refer_invalid_types
152e	Message: The method func-prototype from the type type-name has an illegal argument type Cause: One of the generic type arguments that is implicitly associated to the given method is specified as to be void or non-found into the classpath	Error	refer_invalid_types
152f	Message: The method func-prototype from the type type-name refers to the missing type name Cause: The given method is associated to a type that was not found into the classpath	Error	refer_invalid_types
153	Message: Expecting the return type type-name. It is recommended to write the return type, even if it is inferred from the overridden function Cause: SARL compiler is able to infer the type of the return values of a function according to the inherited prototype for the same function. In this case, it is not mandatory to specify explitly the return type into the overiding prototypes. Nevertheless, it is considered as a good practice to specify the return type. This issue message informs the developer of this recommendation Solving: Add the return type into the overriding function prototype	Configurable; Default is: Warning	return_type_specification_is_recommended
154	Message: SARL library not found on the classpath. Error code: code; Resources on classpath are: classpath Declared fields in SARLVersion class: sarl-verison Cause: The SARL library is not on the classpath. The cause of the error is specified by the given code that is one of NO_SARL_VERSION_CLASS (SARL version class not found), NO_SARL_VERSION_DECLARED_TYPE (SARL version class is not a Xtext declared type), NO_SARL_VERSION_FIELD (SARL version field not found), NO_SARL_VERSION_VALUE (SARL version value not found), or INVALID_SARL_VERSION_BYTECODE (the byte code (the class) of SARLVersion does not contains the expected field) Solving: Reconfigure your project to have the SARL libraries into the classpath	Error	sarl_lib_not_on_classpath
155	Message: Single dispatch method Cause: This issue is generated because you have defined a single function to be a dispatch function. It is not efficient to have a single function to be invoked in the definition of a dispatch function Solving: Remove the dispatch keyword	Configurable; Default is: Warning	single_case_function
156a	Message: Cannot make a static reference to the non-static feature-type feature-name Cause: You are making a reference to a non-static feature (function call or field reference) from a static context. Accessing to a non-static feature needs to provide the instance of the object to access to; that is missed from a static context Solving: Add the missed object reference	Error	static_access_to_instance_member
156b	Message: Cannot make a static reference to the non-static feature-type feature-name from the type type-name Cause: You are making a reference to a non-static feature (function call or field reference) from a static context within the type type-name. Accessing to a non-static feature needs to provide the instance of the object to access to; that is missed from a static context Solving: Add the missed object reference	Error	static_access_to_instance_member
156c	Message: Cannot make a static reference to the non-static type name Cause: When you are defining the generic type arguments, you have to specify types as arguments, e.g. Collection<MyType>. Generic type arguments could only refer to statically declared types Solving: Replace the non-static type reference by an appropriate static type reference	Error	static_access_to_instance_member
156d	Message: Cannot make an implicit reference to this from a static context Cause: You are making an implicit reference to the current object this from a static context. Since it is a static context, this does not exist or is not accessible from it Solving: Add the missed object reference	Error	static_access_to_instance_member
156e	Message: Cannot make an implicit static reference to the non-static extension name Cause: You have defined a non-static extension in the enclosing code. And , you are making a reference to a non-static extension feature (function call usually) from a static context. Accessing to a non-static feature needs to provide the instance of the object to access to; that is missed from a static context Solving: Replace implicit reference by explicit reference to the right object	Error	static_access_to_instance_member
156f	Message: Cannot use name in a static context Cause: You cannot reference a type with name from a static context when the type name is not statically defined Solving: Replace the non-static type reference by an appropriate static type reference	Error	static_access_to_instance_member
157	Message: Suspiciously overloaded method. The feature-type list-of-features overloads the feature-type list-of-rejected-features Cause: You are calling a feature (method, field, etc.). The target feature that is find by the SARL compiler seems to overload another feature, but not direct through an overriding. Indeed, with the extension method mechanism, candidates for being the target feature may be defined in the current type (regular linking), or imported from static types or from objects (extension linking). The selected target feature seems to hide another feature outside the inheritance mechanism between the types Solving: Rewrite your code to remove the suspicious call	Configurable; Default is: Warning	suspiciously_overloaded_feature
158	Message: any-message Cause: This error is generated when your SARL code has an improper syntax, and cannot be parsed by the SARL compiler. The error message provides the detail of the invalid syntax	Error	Syntax
159	Message: any-message Cause: This error is generated when your SARL code has an improper syntax, and cannot be parsed by the SARL compiler. The error message provides the detail of the invalid syntax and the position into your source code that is under failure	Error	Syntax.Range
160	Message: The ternary operator is not allowed. Use a normal if-expression Cause: The ternary operator is the inline if-then-else expression. In some best programming practices, the inline if-then-else are considered as a bad practice. This issue message is generated when an ternary operator is used in your code Solving: Replace the ternary operator by the equivalent if-then-else statement	Configurable; Default is: Ignored	ternary_if_operator_is_not_allowed
161a	Message: Cannot infer type Cause: It is too complex for the SARL compiler to infer the type of the marked feature Solving: Define explicitly the type of the feature	Error	too_little_type_information
161b	Message: Cannot infer type from recursive usage. Type ‘Object’ is used Cause: You code has a type-free feature, e.g. a local variable. SARL cannot infer the type of the feature because a cycle is detected regarding the type definitions Solving: Define explicitly the type of the feature	Error	too_little_type_information
161c	Message: The field name needs an explicit type since there is no initialization expression to infer the type from Cause: You have defined a field without explicitly specifying its type. However, there is not initialization epxression assigned to the field for determining the field’s type Solving: Define explicitly the type of the field	Error	too_little_type_information
161d	Message: There is no context to infer the closure’s argument types from. Consider typing the arguments or put the closures into a typed context Cause: This error is generated when the SARL compiler cannot infer the type of a formal parameter of a closure/lambda expression from the usage context Solving: Define explicitly the formal parameters within the closure; or Make more explicit within the enclosing context the type of the closure’s formal parameter	Error	too_little_type_information
161e	Message: There is no context to infer the closure’s argument types from. Consider typing the arguments or use the closures in a more specific context Cause: This error is generated when the SARL compiler cannot infer the type of the first formal parameter of a closure/lambda expression from the usage context Solving: Define explicitly the formal parameters within the closure; or Make more explicit within the enclosing context the type of the closure’s first formal parameter	Error	too_little_type_information
162	Message: The maximum number of parameters for a closure is six Cause: A constrain given by the underground Java API is the maximum number of formal parameters that could be defined for a closure/lambda expression Solving: Reduce the number of formal parameters of your closure	Error	too_many_params_in_closure
163	Message: The type type-name is not generic; it cannot be parameterized with arguments type-arguments Cause: You have specified generic type parameters to a type that does not accept generic type parameters, e.g. Object<String>, int<String>, MyEnum<String>, MyAnnotation<String> Solving: Remove the generic type parameters	Error	type_argument_on_non_generic_type
164a	Message: Bounds mismatch: The type argument type-argument is not a valid substitute for the bounded type parameter parameter of the feature-type feature-signature Cause: The generic type-argument does not match the type bounding constraints of the corresponding generic type parameter of the specified feature. If the bounding constraint is extends, then the type-argument is not a sub-type of the one specified into the constraint. If the bounding constraint is super, then the type-argument is not a super-type of the one specified into the constraint Solving: Replace type-argument by an appropriate type	Error	type_bounds_missmatch
164b	Message: Bounds mismatch: The type arguments type-arguments are not a valid substitute for the bounded type parameters parameters of the feature-type feature-signature Cause: The type that is specified after a on statement is not a SARL event, i.e. a sub-type of the type Event Solving: Replace type by an appropriate event type	Error	type_bounds_missmatch
164c	Message: Bounds mismatch: The type arguments type-arguments are not a valid substitute for the bounded type parameters type-parameters of the super type super-type Cause: When the super-type is defined with generic type-parameters, a reference to this super-type is provided with type-arguments that are not compatible with the specified type-parameters, i.e., at least one of the specified bounds is not compatible with the provided type-arguments Solving: Replace the invalid type-argument by a type that is compatible with the type-parameters	Error	type_bounds_missmatch
164d	Message: Invalid type: ‘type’. Only type can be used after the keyword ‘kw‘ Cause: The type that is specified after the given keyword kw is not of the expected type. For example, after a on statement, only a SARL event is expected Solving: Replace type by an appropriate event type	Error	type_bounds_missmatch
165	Message: Illegal forward reference to type parameter name Cause: Since Java 5, forward references in type parameters are not allowed. Let define a list of generic type parameters <A, B extends C, C extends A>. In the previous example, C has a backward reference to A; and B has a forward reference to C. Then, extends C causes the generation of this error message. In other words, a local generic type parameters msut be declared before its usage into the bounds of another generic type parameter Solving: Change the order of the generic type parameters	Error	type_parameter_forward_reference
166	Message: Unexpected exception to a static constructor Cause: A static constructor could be defined for initializing the static fields of a type. It is forbidden to define a list of thrown exceptions for a static constructor because they cannot be catched Solving: Remove the thrown definition	Error	unexpected_exception_throw
167	Message: Unexpected formal parameter to a static constructor Cause: A static constructor could be defined for initializing the static fields of a type. It is forbidden to define a formal parameter for a static constructor because their is no way to assign values to the corresponding arguments Solving: Remove the formal parameter(s) from static constructor	Error	unexpected_formal_parameter
168	Message: The syntax for type literals is typeof(name) or name Cause: The type literal, i.e. the name of the type, with *name must follow a string syntax, that is explained in the error message Solving: Use the correct syntax	Error	unexpected_invocation_on_type_literal
169a	Message: Unhandled exception type type-name Cause: Exception type-name has been declared to be throwable by instructions within the code block of an method or a constructor. But, the method or the constructor has no declaration of type-name with throws. This is not an error stricly because SARL compiler is able to propagate the definition of the exceptions to the enclosing function or constructor Solving: Add type-name to throws	Configurable; Default is: Ignored	unhandled_exception
169b	Message: Unhandled exception type type-name thrown by automatic close() invocation on feature Cause: An exception is declared to be throwable by the close() function, which is automatically/implicitly invoked. This exception is not catched. This is not an error stricly because SARL compiler is able to propagate the definition of the exceptions to the enclosing function or constructor Solving: Add catch statement	Configurable; Default is: Ignored	unhandled_exception
169c	Message: Unhandled exception types type-name-1 and type-name-2 Cause: Exceptions have been declared to be throwable by instructions within the code block of an method or a constructor. But, the method or the constructor has no declaration of type-name-1 and typename-2 with throws. This is not an error stricly because SARL compiler is able to propagate the definition of the exceptions to the enclosing function or constructor Solving: Add type-name-1 and type-name-2 to throws	Configurable; Default is: Ignored	unhandled_exception
170	Message: The firing declaration of the event type is not considered by the SARL compiler. Only early-exit events are considered Cause: An event is specified in the liste of fired events of an action. However, the specified event is not marked as an early-exit event. Consequently, the event is not yet supported by the SARL compiler Solving: Remove the event from the list of fired events	Configurable; Default is: Information	unnecessary_fired_event
171	Message: The name modifier is unnecessary on member-name Cause: This issue message is generated when the modifier name is specified on a member that has a default visibility equals to name Solving: Remove the name modifier	Configurable; Default is: Warning	unnecessary_modifier
172	Message: Unqualified super reference is not allowed in interface context Cause: You try to use the super statement from an interface. Because an interface has no associated instance of object and consequently not super-type instance, you cannot call super Solving: Remove super	Configurable; Default is: Error	unqualified_super_call
173	Message: Dead code. The guard is always false Cause: The guard that is specified for a behavior unit is evaluated by the compiler to be always false. In this case, the code of the behavior unit has absolutely no change to be executed. It may denote a problem is the design of the entity in which the behavior unit is defined, e.g. an agent Solving: Change the guard condition; or remove the entier behavior unit	Configurable; Default is: Warning	unreachable_behavior_unit
174	Message: Unreachable code: The case can never match. It is already handled by a previous condition Cause: You have specified a case that is already handled by another case before. It means that this case will never match because the previous one will do Solving: Remove case	Configurable; Default is: Warning	unreachable_case
175	Message: Unreachable code: The catch block can never match. It is already handled by a previous condition Cause: You have specified a catch that is already handled by another catch before. It means that this catch will never match because the previous one will do Solving: Remove catch	Configurable; Default is: Warning	unreachable_catch_block
176a	Message: Dead code: The variable name will never be assigned Cause: This error message is generated when a line of code cannot be reached in all the case. For example a loop with a true condition should never exit from looping. Then, all the statements after the loop becomes unreachable Solving: Remove the dead code	Error	unreachable_code
176b	Message: Unreachable code Cause: This error message is generated when a line of code cannot be reached in all the case. For example a loop with a true condition should never exit from looping. Then, all the statements after the loop becomes unreachable Solving: Remove the dead code	Error	unreachable_code
176c	Message: Unreachable code Cause: This error message is generated when a line of code cannot be reached in all the case. For example a loop with a true condition should never exit from looping. Then, all the statements after the loop becomes unreachable Solving: Remove the dead code	Error	unreachable_code
176d	Message: Unreachable code. The last argument expression does not complete normally Cause: This error message is generated when the evaluation of the last argument causes a stop of the execution sequence that avoid to call the method/constructor for switch the argument is computed Solving: Remove the unreachable code	Error	unreachable_code
176e	Message: Unreachable code. The right argument expression does not complete normally Cause: This error message is generated when the evaluation of the right argument causes a stop of the execution sequence that avoid to call the operator for switch the argument is computed Solving: Remove the unreachable code	Error	unreachable_code
176f	Message: Unreachable expression Cause: This error message is generated when a line of code cannot be reached in all the case. For example a loop with a true condition should never exit from looping. Then, all the statements after the loop becomes unreachable Solving: Remove the unreachable code	Error	unreachable_code
177	Message: Unreachable code: The if condition can never match. It is already handled by a previous condition Cause: Inside a condition of if statement, you have specified multiple tests with instanceof. Since all the boolean conditions are evaluated from left to right, an instanceof test never matches because a left-most instanceof already matches the same scope of types Solving: Remove the unmatchable instanceof	Configurable; Default is: Warning	unreachable_instance_of
178	Message: The statement ‘name’ is not yet supported by the SARL compiler Cause: The keyword with the name is recognized as a keyword y the SARL compiler. However, it is not yet fully supported by the compiler. The keyword is reserved for future usage Solving: Remove the statement	Warning	unsupported_statement
179a	Message: The capacity ‘capacity-name’ is not used Cause: This issue is generated when capacity-name is specified after a uses statement, but none of the capacity’s functions is invoked from the current entity (agent, etc.) Solving: Remove capacity-name from the uses statement	Configurable; Default is: Warning	unused_agent_capacity
179b	Message: Unnecessary use of the capacity ‘capacity-name’ because it is implemented by the current skill Cause: This issue is generated when the capacity named capacity-name is specified after a uses keyword; and it is at the same time an implemented capacity by the skill in which the uses statement is specified. The uses specification is redundant, because the functions that are defined into the capacity capacity-name are already accessible due to their local implementation Solving: Remove capacity-name from the uses statement	Configurable; Default is: Warning	unused_agent_capacity
180	Message: The value of the local variable name is not used Cause: You have declared a local variable with the given name, but never use it somewhere Solving: Remove the variable declaration; or Use the variable	Configurable; Default is: Warning	unused_local_variable
181a	Message: The extension name is not used in type Cause: This warning is generated because you have declared to use an extension field with name in the given type that is never used. This is not a problem for running your program. But, it makes your binary executable file larger than stricly necessary Solving: Remove the extension Delegated to: org.eclipse.jdt.core.compiler.problem.unusedPrivateMember	Delegated; Default is: Warning	unused_private_member
181b	Message: The extension type.name is not used Cause: This warning is generated because you have declared to use an extension with name in the given type that is never used. This is not a problem for running your program. But, it makes your binary executable file larger than stricly necessary Solving: Remove the extension Delegated to: org.eclipse.jdt.core.compiler.problem.unusedPrivateMember	Delegated; Default is: Warning	unused_private_member
181c	Message: The method func-prototype from the type type-name is never used locally Cause: This warning is generated because you have defined a private function that is never called. This is not a problem for running your program. But, it makes your binary executable file larger than stricly necessary Solving: Remove the private function Delegated to: org.eclipse.jdt.core.compiler.problem.unusedPrivateMember	Delegated; Default is: Warning	unused_private_member
181d	Message: The value of the field type.name is not used Cause: This warning is generated because you have defined a private field with name in the given type that is never used. This is not a problem for running your program. But, it makes your binary executable file larger than stricly necessary Solving: Remove the private field Delegated to: org.eclipse.jdt.core.compiler.problem.unusedPrivateMember	Delegated; Default is: Warning	unused_private_member
182	Message: Unused type parameter name. This type parameter is not used for determining if a behavior unit matches a received event Cause: This warning is generated whe you have declared a generic type parameter in an event that is not locally used in this event. When an event is received by an agent, this type parameter cannot be used to detemrine the activable behavior unit in that agent Solving: Remove the type parameter	Warning	unused_type_parameter
183	Message: Discouraged use of reserved annotation. @name is an annotation that is reserved for the compiler usage Cause: SARL core library defines a collection of SARL annotations that are dedicated to the internal usage of the SARL compiler. They are supposed to never be in the SARL code directly. This issue message is generated when one of these SARL annotations is explicitly specified into the code Solving: Remove the SARL annotation from your code	Configurable; Default is: Warning	use_reserved_sarl_annotation
184a	Message: ‘name’ is a reserved keyword which is not allowed as identifier. Please choose another word Cause: You defined the name of a feature by using a name that is equal to a SARL keyword. As in all programming languages, it is forbidden to use a language keyword as identifier Solving: Change name to another identifier that is not a SARL keyword	Error	used_reserved_keyword
184b	Message: ‘name’ is a reserved keyword which is not allowed as identifier. Please choose another word or alternatively confuse your co-workers by escaping it like this: “simple-solution“ Cause: You defined the name of a feature by using a name that is equal to a SARL keyword. As in all programming languages, it is forbidden to use a language keyword as identifier. This error message problem to you a simple-solution Solving: Apply name to simple-solution or to another name that is not a SARL keyword	Error	used_reserved_keyword
185a	Message: ‘name’ is not a valid name Cause: This is the general error for notifying you that the name of an element is invalid. Most of the time, it is due to the use of a forbidden character into the name. The major forbidden character is $. It is not allowed to use it inside a name, even if it is allowed into the Java specification Solving: Rename the element	Error	variable_name_disallowed
185b	Message: Invalid name ‘name’. You must not give to feature a name with reserved characters Cause: You have defined an name for the given feature that contains forbidden characters. The usual forbidden character is $. It is not allowed to use it inside a name because the SARL compiler uses it for internal implementation Solving: Rename your field	Error	variable_name_disallowed
185c	Message: Invalid name ‘name’. You must not give to feature the same name as a reserved keyword Cause: You have defined an name for a feature that is equal to a reserved keyword Solving: Rename your field	Error	variable_name_disallowed
186a	Message: ‘name’ is a discouraged name Cause: This is the general message for notifying you that the name of an element is discouraged. Most of the time, it is due to the fact it may cause ambiguity with SARL language keywords, e.g. self Solving: Rename the element	Configurable; Default is: Warning	variable_name_discouraged
186b	Message: ‘self’ is a discouraged name Cause: self is a name that is used in several other programming languages as a synonym of this. In order to avoid ambiguity, self is a discouraged name Solving: Rename the element	Configurable; Default is: Warning	variable_name_discouraged
187a	Message: Duplicate local variable name Cause: You have declared two different variables in the same scope but with exactly the same name. It is simply forbidden to hide local variables Solving: Rename one of the local variables	Error	variable_name_shadowing
187b	Message: The field ‘field-name’ in ‘type-name’ is hidding the inherited field ‘super-field-name‘ Cause: You have declared a field with the name field-name into the current type; but an accessible field with the same name is also declared into a super-type. It means that the value of the field into the super-type will not be accessible directly from the current type Solving: Rename field field-name	Configurable; Default is: Warning	variable_name_shadowing
188	Message: The type type-name cannot extend or implement other-type. A supertype may not specify any wildcard Cause: The super-type named other-type is defined with wildcard into its generic type parameters. It is forbidden to extends or implement a super-type with a wildcard	Error	wildcard_in_supertype
189a	Message: The annotation @name is disallowed for this location Cause: An annotation is defined in order to be attached to a specific type of element (type, field, method, etc.). This error is generated when an annotation with the given name is attached to a wrong type of element	Error	wrong_annotation_target
189b	Message: Unexpected annotation to a static constructor Cause: A static constructor cannot have an annotation attached to it. This issue message is generated when a static constructor is annotated	Error	wrong_annotation_target

1. Legal Notice

• Specification: SARL General-purpose Agent-Oriented Programming Language (“Specification”)
• Version: 0.14
• Status: Stable Release
• Release: 2024-11-06

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