O'Reilly : Java Database Best Practices by By

Author:By
Language: eng
Format: epub
ISBN: 0-596-00522-9
Publisher: O'Reilly
Published: 2011-10-04T19:40:09.236732+00:00

7.3 EJB BMP with JDO

From a JDO perspective, persisting EJBs as part of a bean-managed persistence model has little difference from persisting other kinds of objects. The most common difference is that you tend to be in a managed environment when working with EJBs; similarly, you tend to be in a nonmanaged environment when building other kinds of applications. You can, of course, build web applications in a managed environment and EJB applications that use bean-managed transactions.

One key differentiator between working with JDO in a managed J2EE container versus a nonmanaged environment—besides the obvious impact of transaction management—is the way you reference the PersistenceManagerFactory class. In a non-J2EE container or a nonmanaged environment, you pass a set of properties to the JDOHelper class. The JDOHelper class then hands you the appropriate PersistenceManagerFactory.

When working in a J2EE container, you can rely on JNDI to provide you with a PersistenceManagerFactory without worrying about properties:

Context ctx = new InitialContext( ); PersistenceManagerFactory factory; factory = (PersistenceManagerFactory)ctx.lookup("jdo/pmf");

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