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This exception has no message.
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java.lang.NullPointerException at javax.swing.DefaultDesktopManager.maximizeFrame( at javax.swing.plaf.basic.BasicInternalFrameUI.maximizeFrame( at javax.swing.plaf.basic.BasicInternalFrameUI$InternalFramePropertyChangeListener.propertyChange( at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange( at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange( at javax.swing.JComponent.firePropertyChange( at javax.swing.JInternalFrame.setMaximum( at mdiTest.initComponents( at mdiTest.<init>( at mdiTest.main(