RCP und Webstart

[SirWayne]

Hat jemand schon Erfahrung darin ob man eien rcp andwendung mit webstart aufrufen kann
ich bekomm immer folgende fehlermeldung

java.lang.NullPointerException
	at java.util.Hashtable.put(Unknown Source)
	at org.eclipse.core.launcher.WebStartMain.basicRun(WebStartMain.java:61)
	at org.eclipse.core.launcher.Main.run(Main.java:973)
	at org.eclipse.core.launcher.WebStartMain.main(WebStartMain.java:40)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.sun.javaws.Launcher.executeApplication(Unknown Source)
	at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
	at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
	at com.sun.javaws.Launcher.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

das hier hab ich auch schon versucht
http://forum.java.sun.com/thread.jspa?threadID=5140289&tstart=615
bringt auch nichts