[jboss-user] [EJB 3.0] - Re: @PersistenceUnit on private javax.persistence.EntityMana

[ALRubinger]

Well, JBoss automatically ships with the Hypersonic database to give you features requiring persistence out of the box...like JMS.

But even if you use the Hypersonic DB, you still need to:

* Create a database (namespace, not database server) for your application (See references for your DB impl).
* Create your DB schema to match that which JPA/EJB3 Entities expect.  See hbm2ddl configuration for Hibernate, can be done from persistence.xml; this will handle this step for you via autogen to save you this step and keep everything in line during development.
* Create a datasource to define the connection pool to your DB.  If you use Hypersonic built-in, this is already done.  Otherwise you must make your own *-ds.xml file and place in "deploy".  http://wiki.jboss.org/wiki/Wiki.jsp?page=DSdotXML
* Create a persistence.xml to define your persistence unit (this will point to your datasource); yes this is where implementation-specific config may be done (ie. Hibernate in JBoss's case)


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