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via Oracle Community by 807546, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at undefined.TestError2.access$000(	at undefined.TestError2$1.updateUI(	at javax.swing.AbstractButton.init(	at javax.swing.JButton.(	at javax.swing.JButton.(	at undefined.TestError2$1.(	at undefined.TestError2.main(