java.lang.reflect.UndeclaredThrowableException
	at $Proxy7.resultChanged(Unknown Source)
	at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLookup.java:89)
	at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.java:130)
	at org.netbeans.modules.openide.windows.GlobalActionContextImpl.propertyChange(GlobalActionContextImpl.java:96)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
	at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:257)
	at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:42)
[catch] at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:140)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:424)
	... 17 more
Caused by: java.lang.NullPointerException
	at org.netbeans.modules.j2ee.ejbcore.Utils.getJavaClassFromNode(Utils.java:458)
	at org.netbeans.modules.j2ee.ejbcore.ui.logicalview.entres.UseDatabaseAction.enable(UseDatabaseAction.java:125)
	at org.openide.util.actions.NodeAction$DelegateAction.resultChanged(NodeAction.java:589)
	... 21 more