[jboss-user] [JBoss Seam] - Seam-managed persistence context

"matt.drees" wrote : | I think nested conversations need to be discussed more. I have the same opinion. "jacob.orshalick" wrote : Maybe an expert on the effects of nested conversations on a Seam managed persistence context could shed some light on this? I'm anything but an expert regarding the effects of nested conversations on a Seam-managed persistence context. So far my understanding (could be wrong) is that a Seam-managed persistence context corresponds to an instance of the org.jboss.seam.persistence.ManagedPersistenceContext component. This is a conversation-scoped component, hence it can be injected into other components using the @In annotation. Unlike "normal" conversation-scoped components, ManagedPersistenceContext is annotated with @BypassInterceptors and @Install(false) however. To define a managed persistence context with the name "entityManager", the typical idiom is that the framework user puts a component definition in config-file components.xml | // components.xml | | <persistence:managed-persistence-context | name="entityManager" | persistence-unit-jndi-name="java:/contactlistEntityManagerFactory"/> | How does a Seam-managed persistence context get instantiated? It gets instantiated like any ordinary Seam component. For example, the Seam CRUD framework classes EntityHome and EntityQuery both extend org.jboss.seam.framework.PersistenceController which creates a Seam-managed persistence context effectively via a call of Component.getInstance(name); Now what happens if a nested conversation is in progress and there is an injection such as the following or another call of Component.getInstance("entityManager")? | @In EntityManager entityManager; //a Seam-managed persistence context | I'd say the usual rules for injections apply, that means Seam tries a hierarchical context search. A nested conversation has read-only access to the context of the outer conversation. Therefore, if a Seam-managed persistence context was instantiated already in the parent conversation, the hierarchical search finds it and the nested conversation thus shares the same persistence context with the parent conversation. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085740#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...