java.lang.Throwable
   at org.netbeans.modules.xml.xam.ModelSource.<init>(ModelSource.java:71)
   at org.netbeans.modules.maven.model.Utilities.createModelSource(Utilities.java:213)
   at org.netbeans.modules.maven.model.Utilities.createModelSource(Utilities.java:181)
   at org.netbeans.modules.maven.repository.ui.ArtifactMultiViewFactory$2.run(ArtifactMultiViewFactory.java:268)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)