JavaMethodLink

rascal-0.34.0

Synopsis

Cannot link to a Java method.

Description

Rascal functions can be implemented in Java. This is the case for many functions in the standard library. This requires these elements:

An abstract Rascal function declaration (= a function header without a body).
The keyword java should be part of the function header.
The function declaration is annotated (uing javaClass) with the name of the Java class that implements this function.

This error is generated when the Java implementation cannot be found. Most likely, this is a missing or misspelled Java class name. It is also generated when the function declaration does have a body.

Remedy: Contact the Rascal developers:

Ask a question on StackOverflow using the Rascal Stackoverflow Tag.
Read the currently open issues at the Rascal's Issue Tracker on Github. If your problem has not yet been reported by someone else, please report it here.

If you are an expert developer and have implemented your own extension in Java, please check your own extension code first.

Examples

This is how the size function on lists is declared in the Rascal library:

rascal>@javaClass{org.rascalmpl.library.Prelude}
>>>>>>>public java int size(list[&T] lst);
int (list[&T]): function(|prompt:///|(0,77,<1,0>,<2,35>))

Misspelling the class name will generate the JavaMethodLink error:

rascal>@javaClass{org.rascalmpl.library.Preludexxx}
>>>>>>>public java int size(list[&T] lst);
org.rascalmpl.exceptions.JavaMethodLink: Cannot link method org.rascalmpl.library.Preludexxx because: class not found
(internal error)
    at $shell$(|main://$shell$|)

org.rascalmpl.exceptions.JavaMethodLink: Cannot link method org.rascalmpl.library.Preludexxx because: class not found
    at org.rascalmpl.interpreter.utils.JavaBridge.getJavaClassInstance(JavaBridge.java:502)
    at org.rascalmpl.interpreter.result.JavaMethod.<init>(JavaMethod.java:94)
    at org.rascalmpl.interpreter.result.JavaMethod.<init>(JavaMethod.java:51)
    at org.rascalmpl.semantics.dynamic.FunctionDeclaration$Abstract.interpret(FunctionDeclaration.java:61)
    at org.rascalmpl.semantics.dynamic.Declaration$Function.interpret(Declaration.java:117)
    at org.rascalmpl.semantics.dynamic.Command$Declaration.interpret(Command.java:38)
    at org.rascalmpl.interpreter.Evaluator.eval(Evaluator.java:1094)
    at org.rascalmpl.interpreter.Evaluator.eval(Evaluator.java:955)
    at org.rascalmpl.interpreter.Evaluator.eval(Evaluator.java:908)
    at org.rascalmpl.repl.RascalInterpreterREPL.evalStatement(RascalInterpreterREPL.java:132)
    at org.rascalmpl.repl.BaseRascalREPL.handleInput(BaseRascalREPL.java:119)
    at lang.rascal.tutor.repl.TutorCommandExecutor.eval(TutorCommandExecutor.java:194)
    at lang.rascal.tutor.repl.TutorCommandExecutorCreator.lambda$eval$2(TutorCommandExecutorCreator.java:82)
    at org.rascalmpl.values.RascalFunctionValueFactory$RascalFunctionValue.call(RascalFunctionValueFactory.java:187)
    at org.rascalmpl.interpreter.result.FunctionResultFacade.call(FunctionResultFacade.java:54)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Assignment.interpret(Statement.java:205)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$For.interpret(Statement.java:468)
    at org.rascalmpl.semantics.dynamic.Statement$Assignment.interpret(Statement.java:205)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:372)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$Try.evalStatementTry(Statement.java:939)
    at org.rascalmpl.semantics.dynamic.Statement$Try.interpret(Statement.java:932)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Expression$Addition.interpret(Expression.java:142)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Assignment.interpret(Statement.java:205)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.ListComprehensionWriter.append(ListComprehensionWriter.java:26)
    at org.rascalmpl.semantics.dynamic.Comprehension.evalComprehension(Comprehension.java:95)
    at org.rascalmpl.semantics.dynamic.Comprehension$List.interpret(Comprehension.java:39)
    at org.rascalmpl.semantics.dynamic.Expression$Comprehension.interpret(Expression.java:681)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.ListComprehensionWriter.append(ListComprehensionWriter.java:26)
    at org.rascalmpl.semantics.dynamic.Comprehension.evalComprehension(Comprehension.java:95)
    at org.rascalmpl.semantics.dynamic.Comprehension$List.interpret(Comprehension.java:39)
    at org.rascalmpl.semantics.dynamic.Expression$Comprehension.interpret(Expression.java:681)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.semantics.dynamic.Statement$NonEmptyBlock.interpret(Statement.java:759)
    at org.rascalmpl.semantics.dynamic.Statement$IfThenElse.interpret(Statement.java:679)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.ListComprehensionWriter.append(ListComprehensionWriter.java:26)
    at org.rascalmpl.semantics.dynamic.Comprehension.evalComprehension(Comprehension.java:95)
    at org.rascalmpl.semantics.dynamic.Comprehension$List.interpret(Comprehension.java:39)
    at org.rascalmpl.semantics.dynamic.Expression$Comprehension.interpret(Expression.java:681)
    at org.rascalmpl.semantics.dynamic.Expression$List.interpret(Expression.java:1530)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.semantics.dynamic.Expression$CallOrTree.interpret(Expression.java:540)
    at org.rascalmpl.semantics.dynamic.ListComprehensionWriter.append(ListComprehensionWriter.java:26)
    at org.rascalmpl.semantics.dynamic.Comprehension.evalComprehension(Comprehension.java:95)
    at org.rascalmpl.semantics.dynamic.Comprehension$List.interpret(Comprehension.java:39)
    at org.rascalmpl.semantics.dynamic.Expression$Comprehension.interpret(Expression.java:681)
    at org.rascalmpl.semantics.dynamic.Statement$Expression.interpret(Statement.java:365)
    at org.rascalmpl.semantics.dynamic.Statement$Return.interpret(Statement.java:782)
    at org.rascalmpl.interpreter.result.RascalFunction.runBody(RascalFunction.java:384)
    at org.rascalmpl.interpreter.result.RascalFunction.call(RascalFunction.java:325)
    at org.rascalmpl.interpreter.result.OverloadedFunction.callWith(OverloadedFunction.java:409)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:369)
    at org.rascalmpl.interpreter.result.OverloadedFunction.call(OverloadedFunction.java:360)
    at org.rascalmpl.interpreter.Evaluator.call(Evaluator.java:743)
    at org.rascalmpl.interpreter.Evaluator.call(Evaluator.java:726)
    at org.rascalmpl.interpreter.Evaluator.call(Evaluator.java:532)
    at org.rascalmpl.interpreter.Evaluator.call(Evaluator.java:489)
    at org.rascalmpl.maven.CompileRascalDocumentation.runCompiler(CompileRascalDocumentation.java:256)
    at org.rascalmpl.maven.CompileRascalDocumentation.execute(CompileRascalDocumentation.java:169)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:370)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:351)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:171)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:163)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:299)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:963)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:296)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
ok

The same error message is generated if the function declaration contains a body:

rascal>@javaClass{org.rascalmpl.library.Preludexxx}
>>>>>>>public java int size(list[&T] lst){
>>>>>>>  return 0;
>>>>>>>}
|prompt:///|(0,94,<1,0>,<4,1>): Java function has a body
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/NonAbstractJavaFunction|
ok

Synopsis​

Description​

Examples​

Synopsis

Description

Examples