[GROOVY-8204] @Delegate on arrays causes NPE during compilation

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.11
• Fix Version/s: 2.4.12
• Assignee: Paul King
• Reporter: Krzysztof Szafrański
• Created: 25/May/17 09:47
• Updated: 06/Mar/18 23:14
• Resolved: 26/May/17 02:37

Description

I have stumbled upon this bug partly by accident, and I'm not convinced it's a valid use case, but either way it should not crash the compiler with a NPE.

Trying to compile the following simple class:

import groovy.lang.Delegate

class BugsMe {

	@Delegate
	byte[] file
}

Results in the following exception:

>>> a serious error occurred: BUG! exception in phase 'canonicalization' in source unit 'BugsMe.groovy' unexpected NullpointerException
>>> stacktrace:
BUG! exception in phase 'canonicalization' in source unit 'BugsMe.groovy' unexpected NullpointerException
	at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1070)
	at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:603)
	at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:581)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:558)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:537)
	at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:61)
	at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:217)
	at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompile(FileSystemCompiler.java:150)
	at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompileWithErrorHandling(FileSystemCompiler.java:180)
	at org.codehaus.groovy.tools.FileSystemCompiler.main(FileSystemCompiler.java:164)
	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:498)
	at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:109)
	at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:131)
Caused by: java.lang.NullPointerException
	at org.codehaus.groovy.ast.ClassHelper.getNextSuperClass(ClassHelper.java:454)
	at org.codehaus.groovy.ast.ClassHelper.getNextSuperClass(ClassHelper.java:449)
	at org.codehaus.groovy.ast.tools.GenericsUtils.extractSuperClassGenerics(GenericsUtils.java:444)
	at org.codehaus.groovy.transform.DelegateASTTransformation.addDelegateMethod(DelegateASTTransformation.java:233)
	at org.codehaus.groovy.transform.DelegateASTTransformation.visit(DelegateASTTransformation.java:129)
	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:1065)
	... 15 more

Issue Links

• links to: GitHub Pull Request #551