Understanding EclipseLink, 2.4
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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: