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Posted to notifications@groovy.apache.org by "Paul King (Jira)" <ji...@apache.org> on 2020/09/26 03:53:00 UTC
[jira] [Commented] (GROOVY-9760) NPE when trait with type parameter
is implemented as raw type
[ https://issues.apache.org/jira/browse/GROOVY-9760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202509#comment-17202509 ]
Paul King commented on GROOVY-9760:
-----------------------------------
A little strange. I went through Groovy versions back to 3.0.1 and 2.5.4 (and master) and all exhibit the NPE unless it is JDK version related?
> NPE when trait with type parameter is implemented as raw type
> -------------------------------------------------------------
>
> Key: GROOVY-9760
> URL: https://issues.apache.org/jira/browse/GROOVY-9760
> Project: Groovy
> Issue Type: Bug
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
>
> Consider the following:
> {code:groovy}
> class C implements T {
> static main(args) {
> new C().one
> }
> }
> trait T<X> {
> X getOne() {}
> }
> {code}
> 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.
> {noformat}
> 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)
> {noformat}
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