java.lang.NullPointerException: This exception has no message.

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via Coderanch by Isaac Hewitt, 1 year ago
This exception has no message.
java.lang.NullPointerException:
at film_titles.poster_manager.DocumentTree.treeWillExpand(Unknown Source)
at javax.swing.JTree.fireTreeWillExpand(JTree.java:2723)
at de.schlichtherle.io.swing.JFileTree.setExpandedDescendants(JFileTree.java:394)
at de.schlichtherle.io.swing.JFileTree.refresh(JFileTree.java:381)
at film_titles.poster_manager.DocumentTree$3.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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