java.lang.IllegalArgumentException: Unknown type class org.netbeans.modules.javacore.jmiimpl.javamodel.ArrayCloneMethod
	at org.netbeans.modules.javacore.internalapi.JavaModelUtil.unwrapElement(JavaModelUtil.java:387)
	at org.netbeans.modules.javacore.internalapi.JavaModelUtil.getOverriddenMethods(JavaModelUtil.java:396)
	at org.netbeans.modules.editor.java.NbJMICompletionJavaDoc$JMIParsingThread.setFeature(NbJMICompletionJavaDoc.java:534)
	at org.netbeans.modules.editor.java.NbJMICompletionJavaDoc$JMIParsingThread.run(NbJMICompletionJavaDoc.java:835)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$DocQuery$DocItem$MyJavaDoc.setItem(JavaCompletionProvider.java:274)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$DocQuery$DocItem$MyJavaDoc.access$100(JavaCompletionProvider.java:267)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$DocQuery$DocItem.<init>(JavaCompletionProvider.java:232)
	at org.netbeans.modules.editor.java.JavaCompletionProvider$DocQuery.query(JavaCompletionProvider.java:199)
	at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:189)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:493)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:926)