Summary

Today, you have seen how Web Service protocols and application styles provide a future route for many application integration projects. Web Services provide a framework for the integration of internal or external applications using HTTP and XML. You have seen that Web Service protocols provide a better solution when exposing functionality for integration than existing RPC or Web mechanisms, and you have explored the Web Service functionality offered in J2EE.

You deployed a servlet-based JAX-RPC Web Service and then called this Web Service through a proxy generated from its WSDL. You deployed an EJB-based JAX-RPC Web Service and used the WSDL generated from it to create a Web Service client. You examined how state and lifecycle are handled for Web Service implementations, and you looked at issues around complex type mapping when marshaling between Java objects and XML data types.