2 Replies Latest reply on Dec 5, 2007 7:19 AM by wu haixing

    When we need an entity-manager-factory?

    wu haixing Newbie

      There are two different SMPC code snippet from the two seam examples:

      <persistence:managed-persistence-context name="entityManager"
       auto-create="true"
       persistence-unit-jndi-name="java:/dvdEntityManagerFactory" />



      <persistence:entity-manager-factory installed="@seamStartsPersistenceUnit@"
       name="wikiEntityManagerFactory"
       persistence-unit-name="wiki"/>
      <persistence:managed-persistence-context name="entityManager"
       auto-create="true"
       entity-manager-factory="#{wikiEntityManagerFactory}"
       persistence-unit-jndi-name="java:/entityManagerFactories/wiki">
       </persistence:managed-persistence-context>

      The second define an entity-manager-factory and use it in the managed-persistence-context.I want to know when the entity-manager-factory is needed.
      I searched in the reference,found it in the three place:
      spring
      oc4j
      special components
      but I cann't figure out it's really usage.