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via Oracle Community by 807546, 1 year ago
This exception has no message.
java.lang.NullPointerException at TestError3.access$000( at TestError3$MyButton.updateUI( at javax.swing.AbstractButton.init( at javax.swing.JButton.<init>( at javax.swing.JButton.<init>( at TestError3$MyButton.<init>( at TestError3.<init>( at TestError3.main(