- extended persistence context with JavaBeans ? 2007-08-13 - By sirandreus
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Hi,
How can I enable an extended persistence context using JavaBeans ? (without EJB
).
I could not manage not get it work. Please read on in order to understand the
problem.
Im using Seam with the following configuration:
- Seam 2.0 Beta1
- JBoss AS 4.2.1
- JavaBeans (without EJB)
- created Project using seam-gen as a war (not ear)
In the Seam book "Simplicity and Power beyond JEE" the author says that the
persistence context of all Seam POJOs is extended.
In order to make sure, that this is true, I??ve ported the Clickable Lists
example (from the official Tutorial := http://docs.jboss.org/seam/latest-2 (See http://est-2.ora-code.com).0
/reference/en/html/tutorial.html#messages) into the JavaBeans Model. The only
differences are:
1) no @(protected) Annotation at the MessageManagerBean class
2) added @(protected) at MessageManagerBean class (as a class level
annotation, so that every method is made trasactional)
3) instad of @(protected), I use @(protected)
The problem is, that the PersistenceContext is not extended as expected. For
example, after calling the "select" method, a database update does "not" happen
.
| public void select() {
| message.setRead(true);
| }
|
However if I replace the implementation with the following code, everything is
fine (update happens):
| @(protected)
| public void select() {
| Message mergedMessage = entityManager.merge(message);
| mergedMessage.setRead(true);
|
| //message.setRead(true);
| }
|
The only logical explanation is that the PersistenceContext is not extended.
Because if it was, the original select implementation should synchronize the
state of the object with the database (and thus making an update).
thanks for your help,
Andreas
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