I obtained the certificate file using java keystore tool and then i added the following lines in my code for logging into the web service

System.setProperty("javax.net.ssl.trustStore","path for the keystore");

org.apache.axis.client.Stub clientStub = (org.apache.axis.client.Stub) WEB_SERVICE;
org.apache.axis.client.Call call = clientStub._getCall();
org.apache.axis.MessageContext msgContext = call.getMessageContext();
sessionID = (String) msgContext.getProperty(org.apache.axis.transport.http.HTTPConstants.HEADER_COOKIE);

and then i printed out the API version details.Then i call the method for getting VM details(name,runtime.powerState).But the objectContent[] returned is null.But i am able to get the VM details if i execute this method(method for getting VM details) alone in a seperate program(as given in sample programs).Any idea?

How to use the obtained session for further communication?

Thanks.