Seam transaction manager : use of ejb-transaction?

[fcousin]

Hello,

I have trouble understanding the reference documentation My Link. Especially these words : If you are working in a Java EE 5 environment, you should install the EJB synchronization component in components.xml: <transaction:ejb-transaction />

[fcousin]

If I am working in an EJB environment, do I always have to install the synchronization component? If not, when do I have to do it? Why? Does the default configuration not work?

I also read the corresponding chapter in Seam in Action, but I still fail to understand this.

What did I miss?

Thans for your help.

Florence.

[fcousin]

Sorry, the link to the documentation is bad : it's here .

[steffi.stephanie.stroka.salzburgresearch.at]

You do not need to implement a synchronization component (actually when you have seam managed transactions). As I understood, you have the possibility to give further instructions  for transaction handling with a synchronization implementation, when

<transaction:ejb-transaction>

is installed, but commit and rollback actions to the database are still managed by Seam.

In the case of our application, we have ejb-transactions enabled and we use it to apply revision management. We get a javax.transaction.UserTransaction by doing a jndi lookup on java:comp/UserTransaction, we store transaction data like updates in another bean which we map to the current transaction and we register a synchronization

((UserTransaction) Component.getInstance("org.jboss.seam.transaction.transaction", 
ScopeType.EVENT) ).registerSynchronization(sync)

which implements beforeCompletion and afterCompletion methods.