java.lang.NullPointerException: This exception has no message.

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via Oracle Community by 807577, 1 year ago
This exception has no message.
java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicInternalFrameUI$1.actionPerformed(BasicInternalFrameUI.java:153)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1502)

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