Today's most popular Web services APIs - JAX-RPC and JAXM - support two very different programming models for invocation of Web services, one synchronous, one asynchronous. If users need both models in a single application, they are forced to use two sets of very different APIs. This article, the first of a two-part series, describes an architecture and programming model - the Web Services Invocation Framework (WSIF) - that provides a single set of APIs that supports both models.
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