[jboss-user] [JBoss Seam] - Re: Nested conversations and transaction management

FabBoco do-not-reply at jboss.com
Tue May 1 17:07:50 EDT 2007


Now I am really confused.

First of all let me update the sample code.


  | @Stateful
  | @Name("A")
  | @Scope(ScopeType.CONVERSATION)
  | public class ABean implements Serializable, A
  | {
  |    @In
  |    private EntityManager				em;
  | 
  |    @In(create = true)
  |    @Out(required = false)
  |    A a;                                      // A entity bean
  | 
  |    @End(beforeRedirect=true)
  |    @Rollback
  |    public String cancel()
  |    {
  |       return "/AList.xhtml";
  |    }
  | 
  |    
  |    @Begin(nested=true)
  |    @TransactionAttribute(TransactionAttributeType.REQUIRED)
  |    public String initCreate()
  |    {
  |       ....
  | 
  |      a = new A();
  | 
  |       return "/A.xhtml";
  |    }
  | 
  |    @End(beforeRedirect=true)
  |    @TransactionAttribute(TransactionAttributeType.REQUIRED)
  |    public String processCreate()
  |    {
  |       ....
  | 
  |       a = em.merge(a);
  | 
  |       return "/ListA.xhtml";
  |    }
  | }
  | 


I have traced what happens at database level and I discovered that the database transaction is started at the merge statement and committed after that the method is ended. I presumed at the end of the conversation.

SURPRISE - SURPRISE !!!

I removed  @End(beforeRedirect=true) from the processCreate() method.
The database transaction is STILL started at the merge statement and STILL committed after that the method is ended.

What is going on ? I thought that using a long-running conversation I was able to manage more http requests before actually write to the database and I thought that the database transaction was committed only at the end of the method annotated with @End. 

Probably I am wrong !

Please, can anyone explain to me which is the relationship between conversation and transaction ? Is this stuff documented somewhere ? 

Thanks

Regards

Fab.


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