java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DeferredDiagnosticHandler@89d812f Thread dump: TimerQueue sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) java.util.concurrent.DelayQueue.take(DelayQueue.java:223) javax.swing.TimerQueue.run(TimerQueue.java:174) java.lang.Thread.run(Thread.java:745) AWT-EventQueue-0 sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) java.awt.EventQueue.getNextEvent(EventQueue.java:554) java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:170) java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) java.awt.EventDispatchThread.pumpEventsForHierarchy(Ev at com.sun.tools.javac.util.Assert.error(Assert.java:162) at com.sun.tools.javac.util.Assert.check(Assert.java:87) at com.sun.tools.javac.util.Log.popDiagnosticHandler(Log.java:526) at com.sun.tools.javac.api.JavacTrees.attributeDocReference(JavacTrees.java:562) at com.sun.tools.javac.api.JavacTrees.ensureDocReferenceAttributed(JavacTrees.java:461) at org.netbeans.api.java.source.TreeUtilities.getReferenceClass(TreeUtilities.java:1685) at org.netbeans.modules.java.editor.base.javadoc.JavadocImports.referenceEmbeddedSourceNodes(JavadocImports.java:604) at org.netbeans.modules.java.editor.base.javadoc.JavadocImports.access$100(JavadocImports.java:87) at org.netbeans.modules.java.editor.base.javadoc.JavadocImports$1.visitReference(JavadocImports.java:139) at org.netbeans.modules.java.editor.base.javadoc.JavadocImports$1.visitReference(JavadocImports.java:122) at com.sun.tools.javac.tree.DCTree$DCReference.accept(DCTree.java:606) at com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:71) at com.sun.source.util.DocTreeScanner.visitLink(DocTreeScanner.java:297) at com.sun.tools.javac.tree.DCTree$DCLink.accept(DCTree.java:503) at com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:71) at com.sun.source.util.DocTreeScanner.scanAndReduce(DocTreeScanner.java:84) at com.sun.source.util.DocTreeScanner.scan(DocTreeScanner.java:99) at com.sun.source.util.DocTreeScanner.visitDocComment(DocTreeScanner.java:184) at com.sun.tools.javac.tree.DCTree$DCDocComment.accept(DCTree.java:135) at com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:50) at org.netbeans.modules.java.editor.base.javadoc.JavadocImports.computeReferencedElements(JavadocImports.java:145) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.handleJavadoc(UnusedImports.java:151) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitVariable(UnusedImports.java:179) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitVariable(UnusedImports.java:130) at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:960) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113) at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:187) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitClass(UnusedImports.java:165) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitClass(UnusedImports.java:130) at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:798) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113) at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:187) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitClass(UnusedImports.java:165) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitClass(UnusedImports.java:130) at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:798) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitCompilationUnit(UnusedImports.java:191) at org.netbeans.modules.java.editor.base.imports.UnusedImports$DetectorVisitor.visitCompilationUnit(UnusedImports.java:130) at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:579) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.editor.base.imports.UnusedImports.process(UnusedImports.java:108) at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase.process(SemanticHighlighterBase.java:300) at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:76) at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase.run(SemanticHighlighterBase.java:157) at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584) at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304) at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725) at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)