How to handle (drag and drop) and Action Event in a JList?
I am having many JList,
On click of an element in JList I am loading a image in JSP.
But If I try to drag and drop one image from one bucket to another bucket Iam not getting any problem,
But I when I drag all the images from the target List to some other List and make the target List empty.
Now If I try to move the image from source list to the target list Iam getting this error,
Exception in thread "AWT-EventQueue-6" java.lang.NullPointerException
at pdfViewer.NewFileSegregater$24.valueChanged(NewFileSegregater.java:1944)
at javax.swing.JList.fireSelectionValueChanged(Unknown Source)
at javax.swing.JList$ListSelectionHandler.valueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.insertIndexInterval(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.intervalAdded(Unknown Source)
at javax.swing.AbstractListModel.fireIntervalAdded(Unknown Source)
at javax.swing.DefaultListModel.addElement(Unknown Source)
at pdfViewer.NewFileSegregater.actionPerformed(NewFileSegregater.java:2918)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener$Actions.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.KeyboardManager.fireBinding(Unknown Source)
at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)
at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(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.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Please help me how to solve this problem..
Er, sure. In the class pdfViewer.NewFileSegregater on line
1944 (!), in the valueChanged() method, something is pointing to
null.
That method is being called from
pdfViewer.NewFileSegregater.actionPerformed() on line
2918 (!!).
Of course, none of us know what's going on in those code
segements but you. And for the record, that's not how to spell
Segregator.
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