Java API for XML-Based RPC (JAX-RPC)
The Java API for XML-based RPC (JAX-RPC) enables Java technology developers to develop SOAP based interoperable and portable web services. JAX-RPC provides the core API for developing and deploying web services on the Java platform.
Developers use the standard JAX-RPC programming model to develop SOAP based web service clients and endpoints. A web service endpoint is described using a Web Services Description Language (WSDL) document. JAX-RPC enables JAX-RPC clients to invoke web services developed across heterogeneous platforms. In a similar manner, JAX-RPC web service endpoints can be invoked by heterogeneous clients. JAX-RPC requires SOAP and WSDL standards for this cross-platform interoperability. JAX-RPC is about web services interoperability across heterogeneous platforms and languages. This makes JAX-RPC a key technology for web services based integration.
Please see http://java.sun.com/xml/jaxrpc/index.html for more information.