java.lang.AssertionError
   at org.netbeans.modules.xml.xdm.diff.MergeDiff.applyAttrTokenChange(MergeDiff.java:323)
   at org.netbeans.modules.xml.xdm.diff.MergeDiff.applyChange(MergeDiff.java:307)
   at org.netbeans.modules.xml.xdm.diff.MergeDiff.applyChanges(MergeDiff.java:281)
   at org.netbeans.modules.xml.xdm.diff.MergeDiff.merge(MergeDiff.java:102)
   at org.netbeans.modules.xml.xdm.XDMModel.mergeDiff(XDMModel.java:265)
   at org.netbeans.modules.xml.xdm.XDMModel.finishSync(XDMModel.java:231)
   at org.netbeans.modules.xml.xdm.XDMModel.sync(XDMModel.java:161)
   at org.netbeans.modules.xml.xdm.xam.XDMAccess.sync(XDMAccess.java:158)
   at org.netbeans.modules.xml.xam.AbstractModel.sync(AbstractModel.java:283)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.checkModelValid(StatusProvider.java:228)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.refreshLinkAnnotations(StatusProvider.java:333)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.access$700(StatusProvider.java:132)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl$5.run(StatusProvider.java:289)
   at org.openide.util.RequestProcessor$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$Processor.run(RequestProcessor.java:2058)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.getUpToDate(StatusProvider.java:286)
   at org.netbeans.modules.editor.errorstripe.AnnotationViewDataImpl.computeTotalStatusType(AnnotationViewDataImpl.java:504)
   at org.netbeans.modules.editor.errorstripe.AnnotationView.drawGlobalStatus(AnnotationView.java:273)
   at org.netbeans.modules.editor.errorstripe.AnnotationView.paintComponent(AnnotationView.java:408)
   at javax.swing.JComponent.paint(JComponent.java:1056)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JLayer.paint(JLayer.java:433)
   at javax.swing.plaf.LayerUI.paint(LayerUI.java:79)
   at org.netbeans.core.multiview.SplitLayerUI.paint(SplitLayerUI.java:157)
   at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
   at javax.swing.JComponent.paintComponent(JComponent.java:780)
   at javax.swing.JLayer.paint(JLayer.java:428)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
   at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1579)
   at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1502)
   at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
   at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
   at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
   at javax.swing.JLayer.paintImmediately(JLayer.java:415)
   at javax.swing.plaf.LayerUI.paintImmediately(LayerUI.java:717)
   at javax.swing.JLayer.paintImmediately(JLayer.java:410)
   at javax.swing.JComponent.paintImmediately(JComponent.java:4950)
   at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
   at javax.swing.RepaintManager$4.run(RepaintManager.java:814)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)
   at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)
   at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)