Cannot Launch SUM Java Unable to Load

Dear Guru's,

I'm going to upgrade Java SP on my SOLMAN 7.1, i have run the ./STARTUP from OS level and SL Controller have been started.

but when I access the SUM via web and launch it, i got this error from Java :

JNLPException[category: Download Error : Exception: java.net.UnknownHostException: xxxxx : LaunchDesc: null ]

  at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)

  at com.sun.javaws.cache.DownloadProtocol.isLaunchFileUpdateAvailable(Unknown Source)

  at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)

  at com.sun.javaws.Launcher.downloadResources(Unknown Source)

  at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)

  at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)

  at com.sun.javaws.Launcher.run(Unknown Source)

  at java.lang.Thread.run(Unknown Source)

I'm Using JRE 1.4.2_16.

i have tried to Run DSUGui from OS level using <sid>adm and still got this error :

<hostname>:smhadm 53> ./DSUGui

java.lang.reflect.InvocationTargetException

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

        at java.lang.reflect.Method.invoke(Method.java:597)

        at SDTGui.showSUMSplashScreen(SDTGui.java:446)

        at SDTGui.configureSUM(SDTGui.java:261)

        at SDTGui.parseArgs(SDTGui.java:171)

        at SDTGui.<init>(SDTGui.java:48)

        at SDTGui.main(SDTGui.java:73)

Caused by: java.awt.HeadlessException:

No X11 DISPLAY variable was set, but this program performed an operation which requires it.

        at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:161)

        at java.awt.Window.<init>(Window.java:432)

        at java.awt.Frame.<init>(Frame.java:403)

        at java.awt.Frame.<init>(Frame.java:368)

        at javax.swing.SwingUtilities$SharedOwnerFrame.<init>(SwingUtilities.java:1734)

        at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1811)

        at javax.swing.JDialog.<init>(JDialog.java:253)

        at javax.swing.JDialog.<init>(JDialog.java:187)

        at javax.swing.JDialog.<init>(JDialog.java:135)

        at com.sap.sdt.gui.core.swing.util.SplashScreen.create(SplashScreen.java:136)

        at com.sap.sdt.gui.core.swing.util.SplashScreen.show(SplashScreen.java:62)

        at com.sap.sdt.gui.core.admin.SDTGuiAdmin.showSUMSplashScreen(SDTGuiAdmin.java:115)

        ... 9 more

Exception in thread "main" java.lang.NullPointerException: while trying to invoke the method java.lang.Object.toString() of a null object loaded from local variable 'result'

        at SDTGui.printErrorMessage(SDTGui.java:332)

        at SDTGui.showSUMSplashScreen(SDTGui.java:476)

        at SDTGui.configureSUM(SDTGui.java:261)

        at SDTGui.parseArgs(SDTGui.java:171)

        at SDTGui.<init>(SDTGui.java:48)

        at SDTGui.main(SDTGui.java:73)

my java version is :

java version "1.4.2_32"

Java(TM) 2 Runtime Environment, Standard Edition (build 4.1.016)

SAP Java Server VM (build 4.1.016 19.1-b02, Jan  2 2012 21:54:35 - 41_REL - optU - linux amd64 - 6 - bas2:164914 (mixed mode))

please help to solve this problem..

Best Regards,

Marvin