18.8. Summary
The J2EE Connector Specification defines the interaction between a resource adapter, its clients, and an application server. If a resource adapter is built according to this Specification, then it should be platform-independent and vendor-neutral. That is, the resource adapter itself should be portable between application servers.
Under this specification, the interface presented by the resource adapter to its clients (the EJBs) may be vendor-specific or follow the provisions of the CCI (common client interface). There are advantages and disadvantages to both approaches. In either case, the Specification allows for the external resource to have transactional semantics and to be integrated with the EJB container’s transaction manager. ...
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