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via Oracle Community by 807593, 1 year ago
java.lang.NullPointerException: 	at Exercise4.Exercise4a.Door.paint(Door.java:23)	at Exercise4.Exercise4a.Exercise4a.init(Exercise4a.java:11)	at sun.applet.AppletPanel.run(AppletPanel.java:341)	at java.lang.Thread.run(Thread.java:536)