java.lang.AssertionError
   at org.netbeans.spi.java.project.support.ui.BrokenReferencesSupport$ProjectDecorator.<init>(BrokenReferencesSupport.java:328)
   at org.netbeans.spi.java.project.support.ui.BrokenReferencesSupport$ProjectDecorator.create(BrokenReferencesSupport.java:356)
   at org.netbeans.spi.java.project.support.ui.BrokenReferencesSupport.isBroken(BrokenReferencesSupport.java:114)
   at org.netbeans.modules.j2ee.common.project.ui.AbstractLogicalViewProvider.hasBrokenLinks(AbstractLogicalViewProvider.java:444)
   at org.netbeans.modules.j2ee.common.project.ui.AbstractLogicalViewProvider$5.run(AbstractLogicalViewProvider.java:399)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1493)
   at org.netbeans.modules.j2ee.common.project.ui.AbstractLogicalViewProvider.testBroken(AbstractLogicalViewProvider.java:439)
   at org.netbeans.modules.j2ee.common.project.ui.AbstractLogicalViewProvider$1.propertyChange(AbstractLogicalViewProvider.java:202)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at org.netbeans.spi.project.support.ant.SequentialPropertyEvaluator.stateChanged(SequentialPropertyEvaluator.java:208)
   at org.openide.util.WeakListenerImpl$Change.stateChanged(WeakListenerImpl.java:329)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.netbeans.spi.project.support.ant.ProjectProperties$PP$2.run(ProjectProperties.java:348)
   at org.netbeans.spi.project.support.ant.ProjectProperties$PP$2.run(ProjectProperties.java:346)
   at org.openide.util.Mutex.readAccess(Mutex.java:290)
   at org.netbeans.spi.project.support.ant.ProjectProperties$PP$3.run(ProjectProperties.java:362)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)