About Externally Managed Transactional Data Sources

EclipseLink transactional data sources are externally managed if the connection pool is managed by a transaction service (such as an application server controlled transaction or a JTA transaction). A JTA managed data source or connection pool is commonly used in Java EE applications and normally required in EJB applications. Use an externally-managed connection pool as follows:

• Configure the session to use an ExternalTransactionController to integrate EclipseLink's unit of work with the external transaction service.

• Use the external-transaction-control option to specify the connection's login and inform EclipseLink that the connection is maintained by the external controller.

• You may need to configure the EclipseLink read connection pool or sequence connection pool to use a non-JTA connection pool in order to avoid transactional overhead.