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# Sessions and CMP

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Although TopLink is an integral part of a J2EE application, in most cases the client does not interact with TopLink directly. Instead, TopLink features are invoked indirectly by way of EJB container callbacks.

In a CMP TopLink project, you do not explicitly create, configure, or acquire a session. The TopLink runtime creates, configures, acquires and uses a session itself internally. For more information, see "Creating Session Metadata". Similarly, in a CMP TopLink project, how metadata is deployed depends on the EJB container and application server you use (see "Deploying Metadata").