I want to use EventQueue to queue events. It is advertised
as a generalized queue that operates on a specific thread.
When I use it on a machine without an X display using the
following code:

public class a
{
    public static void main(String[] args)
        {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run()
                { System.out.println("here"); }
        });
    }
}

I get:

Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':1.0' as the value of the DISPLAY variable.
        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:126)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:130)
        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
        at sun.awt.motif.MToolkit.<clinit>(MToolkit.java:70)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:130)
        at java.awt.Toolkit$2.run(Toolkit.java:712)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:703)
        at java.awt.Toolkit.getEventQueue(Toolkit.java:1479)
        at java.awt.EventQueue.invokeLater(EventQueue.java:757)
        at a.main(a.java:5)