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

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via robocode by hanty
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This exception has no message.
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via jabref by bobo78
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This exception has no message.
via robocode by shinexus
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via Oracle Community by 843805, 1 year ago
This exception has no message.
via Oracle Community by 439115, 6 months ago
java.lang.NullPointerException:
at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)
at javax.swing.UIDefaults.getUI(UIDefaults.java:741)
at javax.swing.UIManager.getUI(UIManager.java:1012)
at javax.swing.JOptionPane.updateUI(JOptionPane.java:1859)
at javax.swing.JOptionPane.(JOptionPane.java:1822)
at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:841)
at javax.swing.JOptionPane.showConfirmDialog(JOptionPane.java:779)
at robocode.AutoExtract.main(Unknown Source)

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