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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at javax.swing.plaf.basic.BasicTreeUI.getDropLineRect()
    2. Java RT
      Component.dispatchEvent
      1. javax.swing.plaf.basic.BasicTreeUI.getDropLineRect(Unknown Source)
      2. javax.swing.plaf.basic.BasicTreeUI.access$1600(Unknown Source)
      3. javax.swing.plaf.basic.BasicTreeUI$Handler.repaintDropLocation(Unknown Source)
      4. javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(Unknown Source)
      5. java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
      6. java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
      7. java.awt.Component.firePropertyChange(Unknown Source)
      8. javax.swing.JTree.setDropLocation(Unknown Source)
      9. javax.swing.TransferHandler$DropHandler.setComponentDropLocation(Unknown Source)
      10. javax.swing.TransferHandler$DropHandler.cleanup(Unknown Source)
      11. javax.swing.TransferHandler$DropHandler.drop(Unknown Source)
      12. java.awt.dnd.DropTarget.drop(Unknown Source)
      13. javax.swing.TransferHandler$SwingDropTarget.drop(Unknown Source)
      14. sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(Unknown Source)
      15. sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(Unknown Source)
      16. sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Unknown Source)
      17. sun.awt.dnd.SunDropTargetEvent.dispatch(Unknown Source)
      18. java.awt.Component.dispatchEventImpl(Unknown Source)
      19. java.awt.Container.dispatchEventImpl(Unknown Source)
      20. java.awt.Component.dispatchEvent(Unknown Source)
      21. java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      22. java.awt.LightweightDispatcher.processDropTargetEvent(Unknown Source)
      23. java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
      24. java.awt.Container.dispatchEventImpl(Unknown Source)
      25. java.awt.Window.dispatchEventImpl(Unknown Source)
      26. java.awt.Component.dispatchEvent(Unknown Source)
      26 frames