call.setOperationName(new QName(NAMESPACE_URI, "echoInt"));
call.addParameter("int_1", Constants.TYPE_LITERAL_INT, ParameterMode.IN);
call.addParameter("int_2", Constants.TYPE_LITERAL_INT, ParameterMode.OUT);
call.setTargetEndpointAddress(TARGET_ENDPOINT_ADDRESS);
IntHolder holder = new IntHolder();
Integer in = new Integer(1);
Object retObj = call.invoke(new Object[]{in, holder});
assertNull(retObj);
Integer out = (Integer)call.getOutputParams().get("int_2");