java.lang.NullPointerException
   at org.netbeans.modules.j2ee.persistence.provider.ProviderUtil.getVersion(ProviderUtil.java:624)
   at org.netbeans.modules.j2ee.persistence.editor.completion.PUCompletor$PersistencePropertyValueCompletor.doCompletion(PUCompletor.java:399)
   at org.netbeans.modules.j2ee.persistence.editor.completion.PUCompletionManager.completeAttributeValues(PUCompletionManager.java:117)
   at org.netbeans.modules.j2ee.persistence.editor.completion.PUCompletionProvider$PUCompletionQuery.getCompletionItems(PUCompletionProvider.java:155)
   at org.netbeans.modules.j2ee.persistence.editor.completion.PUCompletionProvider$PUCompletionQuery.query(PUCompletionProvider.java:134)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.NullPointerException