For the most part, JAX-RPC does a very good job of hiding the details of messages that are exchanged between a web service and its client during a remote procedure call. However, most of the more advanced JAX-RPC features require an understanding of SOAP, the XML-based protocol on which JAX-RPC in particular, and web services in general, are based. This paper paves the way for a more in-depth examination of JAX-RPC by introducing SOAP, together with SAAJ, which is a Java API for creating, sending, and receiving SOAP messages.
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