String msgString = stringWriter.toString();
StringReader reader = new StringReader(msgString);
DeserializationContext dser = new DeserializationContextImpl(
new InputSource(reader), msgContext, org.apache.axis.Message.REQUEST);
dser.parse();
SOAPEnvelope env = dser.getEnvelope();
RPCElement rpcElem = (RPCElement)env.getFirstBody();
RPCParam output = rpcElem.getParam("testParam");
assertNotNull("No <testParam> param", output);
String result = (String)output.getValue();