java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:134)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:141)
        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
        at sun.awt.motif.MToolkit.<clinit>(MToolkit.java:81)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:141)
        at java.awt.Toolkit$2.run(Toolkit.java:748)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:739)
        at java.awt.Toolkit.getEventQueue(Toolkit.java:1519)
        at java.awt.EventQueue.invokeLater(EventQueue.java:792)
        at javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1170)
        at javax.swing.Timer.post(Timer.java:538)
        at javax.swing.TimerQueue.postExpiredTimers(TimerQueue.java:193)
        at -D(TimerQueue.java:229)
        at java.lang.Thread.run(Thread.java:534)