[GROOVY-9760] NPE when trait with type parameter is implemented as raw type

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5.14, 3.0.7, 4.0.0-alpha-2
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 26/Sep/20 02:05
• Updated: 07/Dec/20 22:09
• Resolved: 27/Sep/20 00:01

Description

Consider the following:

class C implements T {
  static main(args) {
    new C().one
  }
}
trait T<X> {
  X getOne() {}
}

No type argument is supplied to T when C implements it. Therefore, the method getOne() is written out with an unresolved type param in its signature.

Exception in thread "main" java.lang.NullPointerException
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:203)
	at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:81)
	at java.beans.FeatureDescriptor.getReturnType(FeatureDescriptor.java:370)
	at java.beans.Introspector.getTargetEventInfo(Introspector.java:1052)
	at java.beans.Introspector.getBeanInfo(Introspector.java:427)
	at java.beans.Introspector.getBeanInfo(Introspector.java:173)
	at groovy.lang.MetaClassImpl.lambda$addProperties$4(MetaClassImpl.java:3416)
	at java.security.AccessController.doPrivileged(Native Method)
	at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3416)
	at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3397)
	at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:273)
	at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:315)
	at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.getMetaClass(MetaClassRegistryImpl.java:258)
	at org.codehaus.groovy.runtime.InvokerHelper.getMetaClass(InvokerHelper.java:987)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallConstructorSite(CallSiteArray.java:82)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:59)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:263)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:268)