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https://issues.apache.org/jira/browse/GROOVY-7855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329484#comment-15329484
 ] 

Paul King commented on GROOVY-7855:
-----------------------------------

I put in a fix which avoids the NPE. I haven't had time to craft a suitable 
standalone test yet. Leaving open until a test is added.

> NullPointerException in GenericsTypeMatcher
> -------------------------------------------
>
>                 Key: GROOVY-7855
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7855
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.4.7
>            Reporter: Graeme Rocher
>
> I am getting the following exception when compiling some classes:
> {code}
> Error:Groovyc: BUG! exception in phase 'instruction selection' in source unit 
> 'grails-datastore-gorm/src/main/groovy/org/grails/datastore/gorm/GormEnhancer.groovy'
>  unexpected NullpointerException
>       at 
> org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1058)
>       at 
> org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:591)
>       at 
> org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:569)
>       at 
> org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:546)
>       at 
> org.jetbrains.groovy.compiler.rt.GroovyCompilerWrapper.compile(GroovyCompilerWrapper.java:62)
>       at 
> org.jetbrains.groovy.compiler.rt.DependentGroovycRunner.runGroovyc(DependentGroovycRunner.java:115)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:497)
>       at 
> org.jetbrains.groovy.compiler.rt.GroovycRunner.intMain2(GroovycRunner.java:134)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:497)
>       at 
> org.jetbrains.jps.incremental.groovy.InProcessGroovyc.runGroovycInThisProcess(InProcessGroovyc.java:156)
>       at 
> org.jetbrains.jps.incremental.groovy.InProcessGroovyc.access$000(InProcessGroovyc.java:51)
>       at 
> org.jetbrains.jps.incremental.groovy.InProcessGroovyc$1.call(InProcessGroovyc.java:85)
>       at 
> org.jetbrains.jps.incremental.groovy.InProcessGroovyc$1.call(InProcessGroovyc.java:82)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
>       at 
> org.codehaus.groovy.ast.GenericsType$GenericsTypeMatcher.compareGenericsWithBound(GenericsType.java:457)
>       at 
> org.codehaus.groovy.ast.GenericsType$GenericsTypeMatcher.matches(GenericsType.java:294)
>       at 
> org.codehaus.groovy.ast.GenericsType.isCompatibleWith(GenericsType.java:198)
>       at 
> org.codehaus.groovy.ast.GenericsType$GenericsTypeMatcher.compareGenericsWithBound(GenericsType.java:457)
>       at 
> org.codehaus.groovy.ast.GenericsType$GenericsTypeMatcher.checkGenerics(GenericsType.java:307)
>       at 
> org.codehaus.groovy.ast.GenericsType$GenericsTypeMatcher.matches(GenericsType.java:276)
>       at 
> org.codehaus.groovy.ast.GenericsType.isCompatibleWith(GenericsType.java:198)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.checkTypeGenerics(StaticTypeCheckingVisitor.java:970)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.checkReturnType(StaticTypeCheckingVisitor.java:1829)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor$1.returnStatementAdded(StaticTypeCheckingVisitor.java:173)
>       at 
> org.codehaus.groovy.classgen.ReturnAdder.addReturnsIfNeeded(ReturnAdder.java:120)
>       at 
> org.codehaus.groovy.classgen.ReturnAdder.addReturnsIfNeeded(ReturnAdder.java:186)
>       at 
> org.codehaus.groovy.classgen.ReturnAdder.visitMethod(ReturnAdder.java:76)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitConstructorOrMethod(StaticTypeCheckingVisitor.java:1787)
>       at 
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:126)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.startMethodInference(StaticTypeCheckingVisitor.java:2119)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitMethod(StaticTypeCheckingVisitor.java:2078)
>       at 
> org.codehaus.groovy.transform.sc.StaticCompilationVisitor.visitMethod(StaticCompilationVisitor.java:164)
>       at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1078)
>       at 
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:53)
>       at 
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitClass(StaticTypeCheckingVisitor.java:249)
>       at 
> org.codehaus.groovy.transform.sc.StaticCompilationVisitor.visitClass(StaticCompilationVisitor.java:123)
>       at 
> org.codehaus.groovy.transform.sc.StaticCompileTransformation.visit(StaticCompileTransformation.java:63)
>       at 
> org.codehaus.groovy.transform.ASTTransformationVisitor.visitClass(ASTTransformationVisitor.java:134)
>       at 
> org.codehaus.groovy.transform.ASTTransformationVisitor$2.call(ASTTransformationVisitor.java:178)
>       at 
> org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1053)
>       ... 22 more
> {code}



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