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This exception has no message.
java.lang.NullPointerException: 	at sun.font.FontDesignMetrics$MetricsKey.init(FontDesignMetrics.java:217)	at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:286)	at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1113)	at javax.swing.JComponent.getFontMetrics(JComponent.java:1626)	at sun.swing.MenuItemLayoutHelper.reset(MenuItemLayoutHelper.java:125)	at javax.swing.plaf.synth.SynthMenuItemLayoutHelper.(SynthMenuItemLayoutHelper.java:119)	at javax.swing.plaf.synth.SynthGraphicsUtils.paint(SynthGraphicsUtils.java:501)	at javax.swing.plaf.synth.SynthMenuItemUI.paint(SynthMenuItemUI.java:281)	at javax.swing.plaf.synth.SynthMenuItemUI.update(SynthMenuItemUI.java:245)	at javax.swing.JComponent.paintComponent(JComponent.java:780)	at javax.swing.JComponent.paint(JComponent.java:1056)	at javax.swing.JComponent.paintChildren(JComponent.java:889)	at javax.swing.JComponent.paint(JComponent.java:1065)	at javax.swing.JComponent.paintChildren(JComponent.java:889)	at javax.swing.JComponent.paint(JComponent.java:1065)	at javax.swing.JComponent.paintChildren(JComponent.java:889)	at javax.swing.JComponent.paint(JComponent.java:1065)	at javax.swing.JLayeredPane.paint(JLayeredPane.java:586)	at javax.swing.JComponent.paintChildren(JComponent.java:889)	at javax.swing.JComponent.paint(JComponent.java:1065)	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1579)	at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1502)	at javax.swing.RepaintManager.paint(RepaintManager.java:1272)	at javax.swing.JComponent._paintImmediately(JComponent.java:5158)	at javax.swing.JComponent.paintImmediately(JComponent.java:4969)	at javax.swing.RepaintManager$4.run(RepaintManager.java:831)	at javax.swing.RepaintManager$4.run(RepaintManager.java:814)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)	at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)