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# TopLink Run-Time Environment

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The TopLink Foundation Library provides the TopLink run-time component. Access the run-time component either directly through the TopLink API or indirectly through a J2EE container when using entity beans with container-managed persistence. The run-time environment is not a separate or external process–it is embedded within the application. Application calls invoke TopLink to provide persistence behavior. This function allows for transactional and thread-safe access to shared database connections and cached objects.

In addition to J2EE environments, TopLink fully supports non-J2EE environments as well. See "Selecting an Architecture With TopLink" for more information.