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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.(	at mdiTest.main(