Can't debug Webstart Program

Hi, I want to debug a program but it is complicated by the fact that it is webstart. But AFAIK the jar files of interest are executed locally. Whenever I try to start debugging in eclipse it gives me this error.

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at ChipSeqToolSet.main(ChipSeqToolSet.java:145)

which corresponds to this bit of code

Code:

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        public static void main(String args[]) {
                String cgiURL = args[0];
                String mode = args[1];               
                Configurator.initialize();
                Configurator.setCGIURL(cgiURL);
                Configurator.setMode(mode);

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Any idea what the problem is and the best way to proceed

Have you googled or looked at the java api doc for ArrayIndexOutOfBoundsException?