The SPIs enables an EIS vendor to provide a standard resource
adapter for its EIS. The resource adapter plugs into an application server, thus
providing connectivity between the EIS, the application server, and the
enterprise application.
If an application server vendor has extended its system to support the JCA, it is
assured of seamless connectivity to multiple EISs. So following JCA, an EIS vendor
needs to provide just one standard resource adapter, which has the capability to
plug-in to any application server that supports the JCA. He can now be assured that
his EIS will plug into the J2EE continuum.
Java Business Integration
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JCA-based adapters are usually used to integrate compliant ESBs with EIS. This
means, by using JCA, an EIS vendor can be assured that his EIS can integrate with
compliant ESBs. JCA provides the most efficient way of resource pooling, thread
pooling, and transaction handling on JMS and other resource adapters. We have
already seen the similarities between a message bus and a service bus. Along those
lines, we can understand how important is the MOM technology such as JMS.
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