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via Oracle Community by 807546, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at TestError3.access$000(TestError3.java:4)	at TestError3$MyButton.updateUI(TestError3.java:12)	at javax.swing.AbstractButton.init(AbstractButton.java:1930)	at javax.swing.JButton.(JButton.java:109)	at javax.swing.JButton.(JButton.java:64)	at TestError3$MyButton.(TestError3.java:9)	at TestError3.(TestError3.java:7)	at TestError3.main(TestError3.java:16)