JCA Concepts
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Internal
Resource Adapter
A resource adapter is a component that implements JCA API and architecture. It is similar to a datasource, however, it provides connectivity to and from an Enterprise Information System (EIS) such as a database, messaging system, transaction processing system, etc. From an Application Server's perspective, a resource adapter is a deployable component, packaged in a Resource Adapter Archive (RAR), whose file can be deployed within the AS.