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SAP NetWeaver Application Server for Java

Basics of the Java Persistence API – Understanding the Entity Manager

Applications that use the new Java Persistence API (JPA) interact with the entity manager – the central interface of JPA – to store data in and retrieve data from a relational database. This article explains the purpose and usage of the different methods in the entity manager interface and elucidates the most fundamental ideas behind it. Special attention is paid to potential programming pitfalls intrinsic to the entity manager API as well as to the specific behavior of SAP JPA 1.0, the JPA implementation delivered with SAP NetWeaver Application Server, Java EE 5 Edition.

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