java.lang.NullPointerException
   at org.openide.util.lookup.InstanceContent$SimpleItem.<init>(InstanceContent.java:198)
   at org.openide.util.lookup.SimpleLookup.<init>(SimpleLookup.java:72)
   at org.openide.util.lookup.Lookups.fixed(Lookups.java:111)
   at org.netbeans.modules.maven.model.Utilities$1.getLookup(Utilities.java:235)
   at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLookup.java:80)
   at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.java:155)
   at org.netbeans.modules.xml.xam.AbstractModelFactory.getEffectiveAccessProvider(AbstractModelFactory.java:119)
   at org.netbeans.modules.xml.xam.AbstractModelFactory.getKey(AbstractModelFactory.java:111)
   at org.netbeans.modules.xml.xam.AbstractModelFactory.getModel(AbstractModelFactory.java:132)
   at org.netbeans.modules.maven.model.pom.POMModelFactory.getModel(POMModelFactory.java:78)
   at org.netbeans.modules.maven.repository.ui.ArtifactMultiViewFactory$1.run(ArtifactMultiViewFactory.java:178)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)