java.lang.NullPointerException

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    • java.lang.NullPointerException at javax.swing.TransferHandler$DropHandler.handleDrag(TransferHandler.java:1381) at javax.swing.TransferHandler$DropHandler.dragOver(TransferHandler.java:1420) at java.awt.dnd.DropTarget.dragOver(DropTarget.java:361) at javax.swing.TransferHandler$SwingDropTarget.dragOver(TransferHandler.java:1169) at sun.awt.dnd.SunDropTargetContextPeer.processMotionMessage(SunDropTargetContextPeer.java:439) at sun.awt.X11.XDropTargetContextPeer.processMotionMessage(XDropTargetContextPeer.java:159) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchMotionEvent(SunDropTargetContextPeer.java:784) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:730) at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30) at java.awt.Component.dispatchEventImpl(Component.java:4267) at java.awt.Container.dispatchEventImpl(Container.java:2116) at java.awt.Component.dispatchEvent(Component.java:4240) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322) at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4057) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3911) at java.awt.Container.dispatchEventImpl(Container.java:2102) at java.awt.Window.dispatchEventImpl(Window.java:2429) at java.awt.Component.dispatchEvent(Component.java:4240) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) 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)
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