On Aug 8, 2006, at 5:27 PM, Dain Sundstrom wrote:
If this is for 1.1, you need to demarcate the transactions using
the TransactionContextManager. I suggest you take a look at the
OnlineUserTransaction for a good example.
IMNSHO container managed jta aint gonna work for 1.1 since it NEEDS
the new jta interface to be able to flush the cache before the tx
commits.
App managed JPA ought to be ok, just stay away from jta.
As dblevins said, the jpa implementation will be managing the tx
locally on the jdbc connection by turning off autocommit and ending
the tx with conn.commit(). This should all work fine (even with a
localtx or xa pool) so long as you don't have any jta activity in
sight. As soon as you start an jta tx the jdbc resource adapter
ought to start complaining vociferously.
thanks
david jencks
-dain
On Aug 8, 2006, at 4:28 PM, Aaron Mulder wrote:
OK, so for this JPA plugin, the goal is to support application-
managed
JPA for web apps.
It looks like a JPA EntityManager has a call to getTransaction
returning an EntityTransaction which you can used to begin and commit
transactions in the non-JTA case (which, for now, let's assume this
would be).
So I'm thinking the code would look like this:
EntityManager mgr = ...
EntityTransaction tx = mgr.getTransaction();
tx.begin();
// save some JPA changes
tx.commit();
There was a comment that we shouldn't used Geronimo DB pools with
JPA,
which I don't follow. What is the suggested way to hook the JPA
provider up to the database? It looks like you provide a
PersistenceUnitInto with methods getJtaDataSource and
getNonJtaDataSource... I don't know which one of these a Geronimo DB
pool would be. Does it depend on whether the pool claims to support
none, local, or XA transactions?
Also, I guess I need to figure out whether we could be in the JTA
case
-- I'm not sure if supplying a JTA DataSource is enough. Maybe then
the code would look like this:
UserTransaction tx = ...
tx.begin();
// save some JPA changes
tx.commit();
I'll keep reading the JPA spec, but in the mean time, if anyone has a
full understanding of this, some insight would be great.
Thanks,
Aaron
