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# Plain Old Java Objects (POJO)

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If you choose to build your service layer with non-EJB Java objects with a J2EE application server, you should use external connection pools (see "External Connection Pools"). If you use a non-J2EE Web server, you should use internal connection pools (see "Internal Connection Pools"). In either case, you may consider using JTA integration (see "JTA Controlled Transactions").