Hello,
I've a problem concerning merge entity bean (EJB3).
I use a session bean stateless with transactions that is able to create, update
and remove an entity bean.
I've created a java client application that uses my session bean.
| @TransactionAttribute(value=TransactionAttributeType.REQUIRES_NEW)
| public void save(Object obj){
| em.merge(obj);
| }
|
| @TransactionAttribute(TransactionAttributeType.REQUIRED)
| public void removeAccessControl(Object obj) throws SecurityException{
| AccessControl access=null;
| access=em.find(AccessControl.class,accessControlid);
|
| //Remove dependecies
| em.remove(access);
| }
|
I run two instances of my client to simulate two users actions. The first one
tries to remove the the entity #1 and the second client tries to rename same
data row(#1).The Remove action is run just before the update.
The remove action deletes my bean in my database. But I was expecting that my
update will fail (I use me.merge(obj)). NO! The row is added with a new ID: #2.
All entity object passed in parameters in my methods are detached.
Is that behavior normal? Is it possible, in my case, to make the entity manager
automatically crache when I try to merge an entity which has been deleted by
another thread without making a database check in my code ?
I tried the following code in my session bean :
| public void test(){
| em.remove(entity);
| /*....*/
| em.merge(entity);
| }
|
Here an exception is thrown that informs me that entity manager cannot merge a
deleted entity. I would like to have the same behavior between 2 different
transactions and 2 different threads...
Thank fo all help answers.
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