java.lang.NullPointerException
   at org.netbeans.modules.j2ee.persistence.provider.ProviderUtil.getVersion(ProviderUtil.java:585)
   at org.netbeans.modules.j2ee.persistence.unit.PersistenceCfgProperties.getKeys(PersistenceCfgProperties.java:228)
   at org.netbeans.modules.j2ee.persistence.unit.Util.getAllPropNames(Util.java:68)
   at org.netbeans.modules.j2ee.persistence.unit.Util.getPropsNamesExceptGeneral(Util.java:72)
   at org.netbeans.modules.j2ee.persistence.unit.PropertiesTableModel.getPropsData(PropertiesTableModel.java:145)
   at org.netbeans.modules.j2ee.persistence.unit.PropertiesTableModel.<init>(PropertiesTableModel.java:67)
   at org.netbeans.modules.j2ee.persistence.unit.PropertiesPanel.<init>(PropertiesPanel.java:59)
   at org.netbeans.modules.j2ee.persistence.unit.PersistenceUnitPanelFactory.createInnerPanel(PersistenceUnitPanelFactory.java:97)
   at org.netbeans.modules.xml.multiview.ui.SectionPanel.createInnerpanel(SectionPanel.java:232)
   at org.netbeans.modules.xml.multiview.ui.SectionPanel.openInnerPanel(SectionPanel.java:214)
   at org.netbeans.modules.xml.multiview.ui.SectionPanel.foldButtonActionPerformed(SectionPanel.java:416)
   at org.netbeans.modules.xml.multiview.ui.SectionPanel.access$200(SectionPanel.java:70)
   at org.netbeans.modules.xml.multiview.ui.SectionPanel$4.actionPerformed(SectionPanel.java:333)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.Component.processMouseEvent(Component.java:6505)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6270)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4492)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2719)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:682)
   at java.awt.EventQueue$3.run(EventQueue.java:680)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:696)
   at java.awt.EventQueue$4.run(EventQueue.java:694)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)