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via Oracle Community by 807592, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicInternalFrameUI$InternalFramePropertyChangeListener.propertyChange(Unknown Source)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)	at javax.swing.JComponent.firePropertyChange(Unknown Source)	at javax.swing.JInternalFrame.dispose(Unknown Source)