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java.lang.NullPointerException: disposed component at sun.awt.windows.Win32SurfaceData.initOps(Native Method) at sun.awt.windows.Win32SurfaceData.<init>(Win32SurfaceData.java:450) at sun.awt.windows.Win32SurfaceData.createData(Win32SurfaceData.java:326) at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:510) at sun.awt.windows.WLabelPeer.<init>(WLabelPeer.java:42) at sun.awt.windows.WToolkit.createLabel(WToolkit.java:311) at java.awt.Label.addNotify(Label.java:171) at java.awt.Container.addNotify(Container.java:2049) at java.awt.Panel.addNotify(Panel.java:71) at java.awt.Container.addNotify(Container.java:2049) at java.awt.Panel.addNotify(Panel.java:71) at java.awt.Container.addNotify(Container.java:2049) at java.awt.Window.addNotify(Window.java:418) at java.awt.Frame.addNotify(Frame.java:482) at java.awt.Window.show(Window.java:459) at GridExample.main(GridExample.java:38)