우분투에서 Jconsole 실행시 NullPointerException 날때 해결법.

Exception in thread "AWT-EventQueue-0" 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.JPanel.updateUI(JPanel.java:109)
        at javax.swing.JPanel.<init>(JPanel.java:69)
        at javax.swing.JPanel.<init>(JPanel.java:92)
        at javax.swing.JPanel.<init>(JPanel.java:100)
        at javax.swing.JRootPane.createGlassPane(JRootPane.java:527)
        at javax.swing.JRootPane.<init>(JRootPane.java:347)
        at javax.swing.JFrame.createRootPane(JFrame.java:260)
        at javax.swing.JFrame.frameInit(JFrame.java:241)
        at javax.swing.JFrame.<init>(JFrame.java:208)
        at sun.tools.jconsole.JConsole.<init>(JConsole.java:97)
        at sun.tools.jconsole.JConsole$6.run(JConsole.java:770)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
해

==> console 에서 export LANG=C
를 수행수 jconsole 를 실행한다.