[GROOVY-6088] Groovy is producing incorrect generic type signatures for getters that are created by closures with JDK7

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 1.8.6, 1.8.9
• Component/s: Compiler
• Labels: usertask
• Environment: JDK7 (Java SE 7u17)
• Assignee: Unassigned
• Reporter: Mikhail Vaschinsky
• Created: 08/Apr/13 09:37
• Updated: 17/Dec/14 13:25
• Resolved: 06/Nov/14 12:35

Description

The same problem that was http://jira.codehaus.org/browse/GROOVY-5034 still exists with JDK7.
The code

    private <T> List<T> getFilterablesForScreen(Collection<PriorityWrapper<T>> sourceSet, Class<? extends IUIScreen> screenClass) {
        sourceSet?.each { PriorityWrapper<T> wrapper ->
                def wrappedObj = wrapper.content
                ...
        }
        ...
    }

throws java.lang.NullPointerException at

sourceSet?.each { PriorityWrapper<T> wrapper ->

execution:

java.lang.NullPointerException
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:332)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:362)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:321)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:362)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:172)
	at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:93)
	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:1130)
	at java.beans.Introspector.getBeanInfo(Introspector.java:414)
	at java.beans.Introspector.getBeanInfo(Introspector.java:161)
	at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:2956)
	at java.security.AccessController.doPrivileged(Native Method)
	at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:2954)
	at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:2937)
	at groovy.lang.ExpandoMetaClass.initialize(ExpandoMetaClass.java:479)
	at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:166)
	at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:182)
	at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.getMetaClass(MetaClassRegistryImpl.java:227)
	at org.codehaus.groovy.runtime.InvokerHelper.getMetaClass(InvokerHelper.java:751)
	at groovy.lang.GroovyObjectSupport.<init>(GroovyObjectSupport.java:32)
	at groovy.lang.Closure.<init>(Closure.java:224)
	at com.devexperts.auto.common.ui.nav.BasicUINavigator$_getFilterablesForScreen_closure2.<init>(BasicUINavigator.groovy)

while

    private <T> List<T> getFilterablesForScreen(Collection<PriorityWrapper<T>> sourceSet, Class<? extends IUIScreen> screenClass) {
        for (PriorityWrapper<T> wrapper: sourceSet){
                def wrappedObj = wrapper.content
                ...
        }
        ...
    }

works properly.

The issue is reproduced only with JDK7 and is not with JDK6.