Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.

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I get the following Exception before start installation of Oracle 10g R2 on Redhat Enterprise Linux 5 :
Exception in thread "main" 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.access$000(X11GraphicsEnvironment.java:53)
at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:142)
at java.security.AccessController.doPrivileged(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
at sun.awt.motif.MToolkit.<clinit>(MToolkit.java:93)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at java.awt.Toolkit$2.run(Toolkit.java:821)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)
at javax.swing.UIManager.initialize(UIManager.java:1262)
at javax.swing.UIManager.maybeInitialize(UIManager.java:1245)
at javax.swing.UIManager.getDefaults(UIManager.java:556)
at com.tibco.administrator.wizard.WizardDialog.setUIFont(WizardDialog.java:208)
at com.tibco.administrator.du.DomainUtility.a(DomainUtility.java:593)
at com.tibco.administrator.du.DomainUtility.main(DomainUtility.java:427)
 
 
So I just Issue the following command:
export DISPLAY=:0
and problem resolved