[GROOVY-6556] NPE on TypeResolver using anonymous inner class and the jdk7 compiler

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.1
• Fix Version/s: 2.4.0-rc-1
• Component/s: Compiler
• Environment: Groovy Version: 2.2.1 JVM: 1.7.0_51 Vendor: Oracle Corporation OS: Linux
• Assignee: Unassigned
• Reporter: Davide Cavestro
• Created: 06/Feb/14 04:57
• Updated: 28/Dec/14 05:36
• Resolved: 28/Dec/14 05:36

Description

I systematically obtain a NullPointerException running some code compiled with the jdk1.7.0_51 (Oracle).

Here is an excerpt from the minimal project I've attached at project.zip

AbstractFoo.groovy

package acme

abstract class AbstractFoo<T,M> implements Foo<T,M> {
    public Foo<T,M> bind (Bar bar, Closure c) {
        bind (bar, new Foo<T,M>() {
                T foo(Bar innerBar, M model) {
                    c.call (innerBar)
                }
        })//FAILS
		
//		bind (bar, [doIt: {}] as Foo) //WORKS
    }
    public abstract AbstractFoo<T,M> bind (Bar bar, Foo<T,M> delegate)
}

Additional info

1. Replacing the anonymous inner class with a map-based interface implementation it works.
2. Using the jdk6 to compile and run the code it works.
3. Compiling the code from Eclipse (using its compiler) then it works.

This is the error stacktrace

java.lang.NullPointerException
at com.sun.beans.TypeResolver.resolve(TypeResolver.java:203)
at com.sun.beans.TypeResolver.resolve(TypeResolver.java:218)
at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:96)
at java.beans.FeatureDescriptor.getParameterTypes(FeatureDescriptor.java:387)
at java.beans.MethodDescriptor.setMethod(MethodDescriptor.java:114)
at java.beans.MethodDescriptor.<init>(MethodDescriptor.java:72)
at java.beans.MethodDescriptor.<init>(MethodDescriptor.java:56)
at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1149)
at java.beans.Introspector.getBeanInfo(Introspector.java:416)
at java.beans.Introspector.getBeanInfo(Introspector.java:163)
at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:3065)
at java.security.AccessController.doPrivileged(Native Method)
at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3063)
at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3046)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:176)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:192)
at acme.AbstractFoo$1.$getStaticMetaClass(AbstractFoo.groovy)
at acme.AbstractFoo$1.<init>(AbstractFoo.groovy)
at acme.AbstractFoo.bind(AbstractFoo.groovy:5)
at acme.AbstractFoo$bind.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
at acme.FooTest.doIt(FooTest.groovy:11)

The attached archive project.zip is both a gradle and an eclipse project demonstrating the issue. I've produced it from scratch in order to closely reflect my real world scenario while limiting it to a bunch of classes and interfaces. However if you want I can probably further reduce it.
BTW running FooTest.groovy from eclipse works fine, while from gradle (using jdk7) or from CLI it fails. As I said above also replacing the anonymous inner class with the map make the test work even with the jdk compiler.

This issue could be related to GROOVY-6088, however I preferred to file it separately.