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java.lang.NullPointerException at oracle.jbo.dt.modeler.diagram.dropHandler.BC4JXMLDropHandler.processObjects(BC4JXMLDropHandler.java:82) at oracle.bm.addinUtil.IDEAppContext$4.performAction(Unknown Source) at oracle.bm.diagrammer.LockMonitor.performLockedAction(Unknown Source) at oracle.bm.diagrammer.BaseDiagram.performDiagramLockedAction(Unknown Source) at oracle.bm.addinUtil.IDEAppContext.dropNavigatorNodeLater(Unknown Source) at oracle.bm.addinUtil.IDEAppContext$5.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)