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

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This exception has no message.
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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 undefined.mdiTest.initComponents(mdiTest.java:59)
at undefined.mdiTest.(mdiTest.java:21)
at undefined.mdiTest.main(mdiTest.java:136)

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