java.lang.NullPointerException
   at org.netbeans.api.project.ProjectUtils.getSources(ProjectUtils.java:102)
   at org.netbeans.modules.j2ee.persistence.dd.PersistenceUtils.getJPAVersion(PersistenceUtils.java:177)
   at org.netbeans.modules.j2ee.ejbcore.ejb.wizard.jpa.dao.EjbFacadeWizardIterator$1.run(EjbFacadeWizardIterator.java:298)
   at org.netbeans.modules.j2ee.ejbcore.ejb.wizard.jpa.dao.EjbFacadeWizardIterator$1.run(EjbFacadeWizardIterator.java:253)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:661)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:151)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:135)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:190)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:103)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:677)
   at org.netbeans.modules.j2ee.ejbcore.ejb.wizard.jpa.dao.EjbFacadeWizardIterator.generate(EjbFacadeWizardIterator.java:253)
   at org.netbeans.modules.j2ee.ejbcore.ejb.wizard.jpa.dao.EjbFacadeWizardIterator.generate(EjbFacadeWizardIterator.java:219)
   at org.netbeans.modules.j2ee.ejbcore.ejb.wizard.jpa.dao.EjbFacadeWizardIterator.generateSessionBeans(EjbFacadeWizardIterator.java:739)
   at org.netbeans.modules.web.jsf.wizards.PersistenceClientIterator$1$1.run(PersistenceClientIterator.java:200)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:122)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:539)
   at org.netbeans.modules.web.jsf.wizards.PersistenceClientIterator$1.run(PersistenceClientIterator.java:190)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:641)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1123)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.NullPointerException