TransientObjectException: save the transient instance before flushing

Question

I'm currently working on a project and I've encountered this error:

org.hibernate.TransientObjectException: object references an unsaved transient instance – save the transient instance before flushing

What happened: 1.) I have a session scope variable that I set after login, let's say SessionScopeVariableA.

2.) Then I have a page where I'm adding an entity, let's say EntityA.

3.) EntityA has a lazy field sessionScopeVariableA, so when I invoke the add method I have to set this variable.

entityA.setSessionScopeVariableA(sessionScopeVariableA); em.persist(entityA);

4.) Note that SessionScopeVariableA is wrap in a session scope producer while the action is conversation scope.

5.) Whatever I do, I always end up with the transient error specified above.

Any idea?

Yes, the app is a multi-tenant 1 so during login, the user who signin needs to select what tenant he has to work and that will be save in the session scope. — czetsuya
– czetsuya, Commented Apr 17, 2013 at 2:18

czetsuya · Accepted Answer · 2013-04-17 02:28:45Z

What solved this problem was managing the connection resource with CDI using solder. This is how we did this:

//qualifier for the tenant

@Retention(RetentionPolicy.RUNTIME) @Target({ ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.TYPE }) public @interface CurrentTenant { } //producer for the current tenant @Produces @Named("currentTenant") @CurrentTenant public Provider getCurrentTenant() { //.. }

//in a separate util class, define how you want to manage the connection resource (cdi)

@ExtensionManaged @ConversationScoped @Produces @PersistenceUnit(unitName="myEM") @MyEMJpa private EntityManagerFactory em;

//interface for the connection resource

@Qualifier @Retention(RetentionPolicy.RUNTIME) @Target({ ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.TYPE }) public @interface MyEMJpa { }

//inject entity manager in your service

@Inject @MyEMJpa protected EntityManager em;

//How to inject the current tenant

@Inject @CurrentTenant private Provider currentTenant;

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