Stop and re-start JCo Idoc Server

Hi

I created a JCO IDoc server (using the JCoIDocServer class) , so far it works fine for me to send and receive IDocs to R/3. The only issue is when I try to start and stop the JCO Idoc server at runtime. When I call the Stop method(). It seems like the service is stopped but if i call a Start method after that( even on a completely new class instance) I'm getting a nullpointer exception. I have seen documents on JCOServer says that use suspend method for stop the server, but this is not available for the JCoIDocServer class. How can I stop a server which is running, programaticalluy and restart it again ? (I dont mind if I have to reinstantiate the whole server class) . I use JCO and IDoc libaray version 3.0 . Please help

Thanks