java.lang.NullPointerException

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    • java.lang.NullPointerException at javax.swing.plaf.basic.BasicListUI$ListDropTargetListener.updateInsertionLocation(BasicListUI.java:2241) at javax.swing.plaf.basic.BasicDropTargetListener.dragOver(BasicDropTargetListener.java:230) at javax.swing.TransferHandler$SwingDropTarget.dragOver(TransferHandler.java:567) at sun.awt.dnd.SunDropTargetContextPeer.processMotionMessage(SunDropTargetContextPeer.java:484) at sun.awt.dnd.SunDropTargetContextPeer.access$600(SunDropTargetContextPeer.java:52) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchMotionEvent(SunDropTargetContextPeer.java:781) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:738) at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:29) at java.awt.Component.dispatchEventImpl(Component.java:3456) at java.awt.Container.dispatchEventImpl(Container.java:1623) at java.awt.Component.dispatchEvent(Component.java:3439) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450) at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:3236) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3090) at java.awt.Container.dispatchEventImpl(Container.java:1609) at java.awt.Window.dispatchEventImpl(Window.java:1585) at java.awt.Component.dispatchEvent(Component.java:3439) at java.awt.EventQueue.dispatchEvent(EventQueue.java:450) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136) at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

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