The JCA specification defines a standard for enabling connectivity and
interaction between application server and EIS. Resource adapters and
application servers implement the contract defined in the JCA specification.
Resource adapters run in the context of the application server and enable J2EE
application components to interact with the EIS using a common client interface.
JCA compliant application servers can support any JCA compliant resource
adapter and vice-versa. Figure2-6 illustrates an application component
connected to an EIS through the resource adapter.
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