You  need to register your  Type Mapping before e.c.:
        Class cls = null;
        Service service = new Service();
        Call  call = (Call) service.createCall();
        QName qName;
        //for java bean
        Class beansf = BeanSerializerFactory.class;;
       Class  beandf = BeanDeserializerFactory.class;
       //for simple type
         Class simplesf = SimpleSerializerFactory.class;
         Class  simpledf = SimpleDeserializerFactory.class;
         // for java bean
          qName = new javax.xml.namespace.QName(
                   "http://www.w3.org/2001/XMLSchema",
                   "anyType");
           call.registerTypeMapping(cls, qName, beansf, beandf);

       //for simple type , you can register int type as java String or
something other
java simple  type

          qName = new javax.xml.namespace.QName(
                   "http://www.w3.org/2001/XMLSchema",
                   "int");
           call.registerTypeMapping(String.class, qName, simplesf,
                                    simpledf);

        //after that you need to poit your expected return type before
call.invoke
       call.setReturnType(new javax.xml.namespace.QName("someURL  ",
               "MyReturnType"));
        // and ivoke  call
        MyReturnType ret = (MyReturnType) call.invoke(new Object[]
{instanceMySendObject });
You can define you return type yourself
Best Vahan