java.lang.NullPointerException

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    • java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.getDropLineRect(Unknown Source) at javax.swing.plaf.basic.BasicTreeUI.access$1600(Unknown Source) at javax.swing.plaf.basic.BasicTreeUI$Handler.repaintDropLocation(Unknown Source) at javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(Unknown Source) at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source) at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source) at java.awt.Component.firePropertyChange(Unknown Source) at javax.swing.JTree.setDropLocation(Unknown Source) at javax.swing.TransferHandler$DropHandler.setComponentDropLocation(Unknown Source) at javax.swing.TransferHandler$DropHandler.cleanup(Unknown Source) at javax.swing.TransferHandler$DropHandler.drop(Unknown Source) at java.awt.dnd.DropTarget.drop(Unknown Source) at javax.swing.TransferHandler$SwingDropTarget.drop(Unknown Source) at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(Unknown Source) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(Unknown Source) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Unknown Source) at sun.awt.dnd.SunDropTargetEvent.dispatch(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processDropTargetEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source)
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