CCI

CCI provides the ability to write more complex Java interfaces to manipulate an EIS. It's the job of CCI to define an EIS-neutral client API that allows the J2EE components to communicate with many EIS resources at the same time through a single layer of abstraction. In essence, CCI is a remote function call interface for executing information extraction and perhaps method invocation in the EIS.

As we move to more service-oriented type frameworks, CCI will become more important. What's more, the fact that CCI is EIS independent makes it even more powerful because, like the JDBC for databases, you merely program to a single interface, and the differences with the native APIs are accounted for in the JCA resource adapter. The use of CCI is the fundamental advantage of JCA.