Integrating existing functionality into BPEL processes can be achieved by using the popular WSIF (Web Services Invocation Framework). WSIF uses WSDL as a normalized description of disparate software, shielding developers from differences in Web service implementations and access methods. WSIF leverages WSDL's capability to offer multiple bindings for a given Web service. A BPEL orchestration server deploying BPEL processes can use WSIF to enable transparent access to a variety of existing applications, given they are described using WSDL and that WSIF providers are available to support the specific protocols to access these resources.
For example, a BPEL process can access SAP BAPIs through a WSIF provider that supports JCA, where the latter includes a SAP adapter. In this example, the combination of BPEL and JCA, enables companies to integrate their existing resources into business processes utilizing 100% standards-based solution.
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