java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:126)
   at com.sun.tools.javac.util.Assert.check(Assert.java:45)
   at com.sun.tools.javac.comp.MemberEnter$5.enterAnnotation(MemberEnter.java:1024)
   at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:131)
   at com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:123)
   at com.sun.tools.javac.comp.Enter.complete(Enter.java:747)
   at com.sun.tools.javac.main.JavaCompiler.complete(JavaCompiler.java:1036)
   at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:998)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.enterTrees(JavacProcessingEnvironment.java:1028)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.<init>(JavacProcessingEnvironment.java:927)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.next(JavacProcessingEnvironment.java:945)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1122)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1206)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1093)
   at com.sun.tools.javac.main.JavaCompiler.complete(JavaCompiler.java:801)
   at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2545)
   at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2440)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:553)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1020)
   at com.sun.tools.javac.jvm.ClassReader.completeEnclosing(ClassReader.java:2477)
   at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2434)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:553)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1020)
   at com.sun.tools.javac.model.JavacElements.binaryNameToClassSymbol(JavacElements.java:134)
   at com.sun.tools.javac.model.JavacElements.getTypeElementByBinaryName(JavacElements.java:119)
   at org.netbeans.api.java.source.ElementHandle.getTypeElementByBinaryName(ElementHandle.java:622)
   at org.netbeans.api.java.source.ElementHandle.resolveImpl(ElementHandle.java:160)
   at org.netbeans.api.java.source.ElementHandle.resolve(ElementHandle.java:136)
   at org.netbeans.modules.editor.java.LazyJavaCompletionItem$1.run(LazyJavaCompletionItem.java:108)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:593)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:203)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.editor.java.LazyJavaCompletionItem.accept(LazyJavaCompletionItem.java:103)
   at org.netbeans.modules.editor.completion.CompletionImpl$1.accept(CompletionImpl.java:142)
   at org.netbeans.modules.editor.completion.CompletionImpl.requestShowCompletionPane(CompletionImpl.java:960)
   at org.netbeans.modules.editor.completion.CompletionImpl.finishNotify(CompletionImpl.java:1457)
   at org.netbeans.modules.editor.completion.CompletionResultSetImpl.finish(CompletionResultSetImpl.java:274)
   at org.netbeans.spi.editor.completion.CompletionResultSet.finish(CompletionResultSet.java:245)
   at org.netbeans.modules.j2ee.persistence.editor.completion.JPACodeCompletionProvider$JPACodeCompletionQuery.query(JPACodeCompletionProvider.java:162)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.AssertionError