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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.<init>(mdiTest.java:21) at mdiTest.main(mdiTest.java:136)