Re: JCA and javax.sql

J2EE Connector Architecture (or simply Connectors) primarily defines the
pluggability contracts (SPI) for a J2EE Container. The Connector specification
also defines an optional CCI that can be used by applications.

The CCI is just one kind of API that a resource adapter can expose to the
application. It is possible for a resource adapter to use non-CCI APIs to the
application as well.

For example, with Connector 1.5, it is now possible to plug-in a JMS provider
into a J2EE Container using a resource adapter. The application would use JMS
specific APIs to send and receive messages.

Another example is JDBC. It is possible to implement a JDBC resource adapter
(based on Connector contracts), and plug it into a J2EE Container. Such a
resource adapter would expose JDBC API to the applications.

Thus, Connectors serve as the pluggability point for integrating external
systems / resources into a J2EE Container. Such a Connector can expose any API
to the applications, in spite of CCI.

Ram Jeyaraman
Specification Lead,
J2EE Connector Architecture 1.5

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