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java.lang.NullPointerException: 	at javax.swing.DefaultDesktopManager.maximizeFrame(DefaultDesktopManager.java:90)	at javax.swing.plaf.basic.BasicInternalFrameUI.maximizeFrame(BasicInternalFrameUI.java:629)	at javax.swing.plaf.basic.BasicInternalFrameUI$InternalFramePropertyChangeListener.propertyChange(BasicInternalFrameUI.java:437)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:264)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:232)	at javax.swing.JComponent.firePropertyChange(JComponent.java:3814)	at javax.swing.JInternalFrame.setMaximum(JInternalFrame.java:964)	at mdiTest.initComponents(mdiTest.java:59)	at mdiTest.(mdiTest.java:21)	at mdiTest.main(mdiTest.java:136)