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JWSDP(JAX-RPC) - modeler error

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Joined: 2007-08-20

I am very new to Java web services .. just trying with some sample programs.
I am trying to generate server ties from the service end point config.xml.. below is the code snippet which i have used.
public interface StockQuoteProvider extends java.rmi.Remote {
public float getLastTradePrice(String tickerSymbol)
throws java.rmi.RemoteException;
public String getStockQuote(String tickerSymbol)
throws java.rmi.RemoteException;


and I am using the command at prompt

/> wscompile -cp . -gen:server config.xml

Here i got stuck., its giving me the error message :
error : modeler error : java.lang.NullPointerException

Please help me.. Thanks in Advance.