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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.<init>(JButton.java:109) at javax.swing.JButton.<init>(JButton.java:64) at TestError3$MyButton.<init>(TestError3.java:9) at TestError3.<init>(TestError3.java:7) at TestError3.main(TestError3.java:16)