java.lang.NullPointerException
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator.addImplementsClause(JpaControllerGenerator.java:220)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator.generateJpaController(JpaControllerGenerator.java:168)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerIterator.generateJpaControllers(JpaControllerIterator.java:286)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerIterator$1.run(JpaControllerIterator.java:133)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1411)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1991)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:428)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerIterator$2.run(JpaControllerIterator.java:175)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)