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https://issues.apache.org/jira/browse/GROOVY-7921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15453610#comment-15453610
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Paul King commented on GROOVY-7921:
-----------------------------------
Totally agree. I was keeping this issue to just removing the "BUG! exception".
We need to raise another issue for catching and reporting left over "this"
statements. Implemented in somewhere like the Verifier sounds right to me.
> using "this" as the target of an assignment not working with Category
> annotation
> --------------------------------------------------------------------------------
>
> Key: GROOVY-7921
> URL: https://issues.apache.org/jira/browse/GROOVY-7921
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7
> Environment: mac os x 10.10.5
> jdk 1.8.0_51
> Reporter: kyon_mm
> Assignee: Paul King
> Fix For: 2.4.8
>
>
> when I executed this code in GroovyConsole
> {code:java}
> @Category(Integer)
> class IntegerEx {
> def reset(int value) {
> this = value
> this
> }
> }
> use(IntegerEx){
> println (1 + 2).reset(1)
> }
> {code}
> Then, I get this exception log
> {code}
> Exception thrown
> BUG! exception in phase 'semantic analysis' in source unit 'ConsoleScript17'
> null
> at
> org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:935)
> at
> org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:593)
> at
> org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:542)
> at
> groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:298)
> at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:268)
> at groovy.lang.GroovyShell.parseClass(GroovyShell.java:688)
> at groovy.lang.GroovyShell.run(GroovyShell.java:517)
> at groovy.lang.GroovyShell.run(GroovyShell.java:497)
> at groovy.lang.GroovyShell.run(GroovyShell.java:170)
> at groovy.lang.GroovyShell$run$1.call(Unknown Source)
> at
> groovy.ui.Console$_runScriptImpl_closure16.doCall(Console.groovy:1005)
> at groovy.ui.Console$_runScriptImpl_closure16.doCall(Console.groovy)
> at sun.reflect.GeneratedMethodAccessor218.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at
> org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)
> at groovy.lang.Closure.call(Closure.java:414)
> at groovy.lang.Closure.call(Closure.java:408)
> at groovy.lang.Closure.run(Closure.java:495)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.checkForFinal(VariableScopeVisitor.java:388)
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.checkFinalFieldAccess(VariableScopeVisitor.java:381)
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.visitBinaryExpression(VariableScopeVisitor.java:365)
> at
> org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:51)
> at
> org.codehaus.groovy.ast.CodeVisitorSupport.visitExpressionStatement(CodeVisitorSupport.java:71)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitExpressionStatement(ClassCodeVisitorSupport.java:196)
> at
> org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:42)
> at
> org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:37)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:166)
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.visitBlockStatement(VariableScopeVisitor.java:308)
> at
> org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:71)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:104)
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.visitConstructorOrMethod(VariableScopeVisitor.java:505)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:126)
> at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1078)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:53)
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.visitClass(VariableScopeVisitor.java:473)
> at
> org.codehaus.groovy.control.CompilationUnit$11.call(CompilationUnit.java:648)
> at
> org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:931)
> ... 22 more
> {code}
> Is this behavior groovy-language specification ?
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