Found one Java-level deadlock:
=============================
"Java Source Worker Thread":
  waiting to lock monitor 0x08671be8 (object 0x82c20938, a org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl),
  which is held by "AWT-EventQueue-1"
"AWT-EventQueue-1":
  waiting to lock monitor 0x08671e40 (object 0x82baf410, a org.netbeans.modules.java.editor.semantic.OccurrencesMarkProvider),
  which is held by "Java Source Worker Thread"

Java stack information for the threads listed above:
===================================================
"Java Source Worker Thread":
	at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.propertyChange(AnnotationViewDataImpl.java:483)
	- waiting to lock <0x82c20938> (a org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
	at org.netbeans.modules.editor.errorstripe.privatespi.MarkProvider.firePropertyChange(MarkProvider.java:79)
	at org.netbeans.modules.java.editor.semantic.OccurrencesMarkProvider.setOccurrences(OccurrencesMarkProvider.java:101)
	- locked <0x82baf410> (a org.netbeans.modules.java.editor.semantic.OccurrencesMarkProvider)
	at org.netbeans.modules.java.editor.semantic.MarkOccurencesHighlighter.run(MarkOccurencesHighlighter.java:107)
	at org.netbeans.modules.java.editor.semantic.MarkOccurencesHighlighter.run(MarkOccurencesHighlighter.java:56)
	at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1136)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)
"AWT-EventQueue-1":
	at org.netbeans.modules.java.editor.semantic.OccurrencesMarkProvider.getMarks(OccurrencesMarkProvider.java:65)
	- waiting to lock <0x82baf410> (a org.netbeans.modules.java.editor.semantic.OccurrencesMarkProvider)
	at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.createMergedMarks(AnnotationViewDataImpl.java:223)
	at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.getMergedMarks(AnnotationViewDataImpl.java:231)
	- locked <0x82c20938> (a org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl)
	at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.getMarkMap(AnnotationViewDataImpl.java:409)
	- locked <0x82c20938> (a org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl)
	at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.findNextUsedLine(AnnotationViewDataImpl.java:336)
	at org.netbeans.modules.editor.errorstripe.AnnotationView.paintComponent(AnnotationView.java:268)
	at javax.swing.JComponent.paint(JComponent.java:1022)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	- locked <0x7b5f1f40> (a java.awt.Component$AWTTreeLock)
	at javax.swing.JComponent.paint(JComponent.java:1031)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	- locked <0x7b5f1f40> (a java.awt.Component$AWTTreeLock)
	at javax.swing.JComponent.paint(JComponent.java:1031)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	- locked <0x7b5f1f40> (a java.awt.Component$AWTTreeLock)
	at javax.swing.JComponent.paint(JComponent.java:1031)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	- locked <0x7b5f1f40> (a java.awt.Component$AWTTreeLock)
	at javax.swing.JComponent.paint(JComponent.java:1031)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5104)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1132)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5052)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4862)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:727)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:683)
	at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:663)
	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

Found 1 deadlock.