Craig,
There is no other documentation except the Javadoc. Spec will soon be
kept at http://java.sun.com/products/jta , waiting for the license text.
regards
sankar
Craig L Russell wrote:
Hi Sankara,
Hi Ram,
Is there any documentation other than the Javadoc? I dont' recall
there being anything else, but the Javadoc is pretty complete.
Most of the discussion in the JCP Expert Group ended up with our
making clarifications to the Javadoc.
Regards,
Craig
On Feb 4, 2007, at 5:40 PM, David Jencks wrote:
Thanks for pointing this out. Fixed, see
https://issues.apache.org/jira/browse/GERONIMO-2795.
When first reading the javadoc I was being a bit too picky and
decided that "register a synchronization" meant you could only
register one despite not being able to see how this would work if you
had more than one jpa provider used in a tx. I see this is the same
wording that tx.registerSynchronization uses so presumably the intent
ought to be clear :-)
BTW I continue to be unable to find any jta 1.1 documentation other
than the javadoc. Has anyone else found an actual spec? I've been
looking at http://java.sun.com/products/jta/
thanks
david jencks
On Feb 4, 2007, at 12:11 PM, Craig L Russell wrote:
Hi Andrus,
On Feb 4, 2007, at 8:37 AM, Andrus Adamchik wrote:
Hi Dain,
Just got some time to write a JPA/OpenEJB integration test
following your example. Everything works except for one thing. Here
is my sample code:
GeronimoTransactionManagerJTA11 tm = new
GeronimoTransactionManagerJTA11();
System.setProperty(
Context.INITIAL_CONTEXT_FACTORY,
LocalInitialContextFactory.class.getName());
new
InitialContext().bind("java:comp/TransactionSynchronizationRegistry",
tm);
EntityManagerFactory factory = ... // init code for Cayenne JTA EMF
JtaEntityManagerRegistry registry = new JtaEntityManagerRegistry(tm);
tm.begin();
EntityManager entityManager = new JtaEntityManager(
registry,
factory,
new Properties(),
false);
SimpleEntity e = new SimpleEntity();
e.setProperty1("XXX");
entityManager.persist(e);
tm.commit(); // Nothing is saved to the DB here
Now the problem...
According to the JPA spec, ch. 5.9.2, "When
EntityManagerFactory.createEntityManager is invoked, the provider
must create and return a new entity manager. If a JTA transaction
is active, the provider must register for synchronization
notifications against the JTA transaction."
So that's what Cayenne EMF does [1], [2] via
TransactionSynchronizationRegistry.registerInterposedSynchronization(..).
At a later time OpenEJB JtaEntityManager calls the same method on
the registry to register a its own close operation, kicking out
Cayenne EM callback. The end result is that the EntityManager is
not flushed in "beforeCompletion" and nothing is saved to DB.
I suspect Geronimo TransactionImpl is to blame here. It only allows
a single interposed synchronization. Is it a requirement of the JTA
spec?
The intent of the registerInterposedSynchronization method is to
allow any number of callbacks to be registered for synchronization.
It's a bug if only one is allowed. There is no requirement for any
particular ordering among the callbacks but multiple callbacks are
required to be supported.
Craig
(if it is, I couldn't find any mention of it). If everyone agrees
with my assessment of the situation, I can submit a patch.
Thoughts?
Andrus
[1]
https://svn.apache.org/repos/asf/cayenne/main/trunk/framework/cayenne-jpa-unpublished/src/main/java/org/apache/cayenne/jpa/JtaEntityManagerFactory.java
[2]
https://svn.apache.org/repos/asf/cayenne/main/trunk/framework/cayenne-jpa-unpublished/src/main/java/org/apache/cayenne/jpa/JtaEntityManager.java
On Jan 11, 2007, at 10:34 PM, Dain Sundstrom wrote:
I just committed the JtaEntityManager and JtaEntityManagerRegistry
to the openejb-persistence module. You can create a
JtaEntityManager with the following code:
JtaEntityManagerRegistry registry = new
JtaEntityManagerRegistry(transactionSynchronizationRegistry);
EntityManager entityManager = new JtaEntityManager(registry,
entityManagerFactory,
properties,
extended);
That's it. The under the covers of the JtaEntityManager a new
EntityManager instance is created using the EMF for each transaction.
A single instance of the JtaEntityManagerRegistry should be shared
by all JtaEntityManagers. TransactionSynchronization registry is a
new interface in JTA 1.1. The Geronimo JTA 1.1 transaction manager
implements this interface directly, but if you are not using that
transaction manager just wrap your transaction manager with the
openejb SimpleTransactionSynchronizationRegistry.
If you want to test extended entity managers (only used by
stateful session beans), you will need to simulate stateful
session bean construction, entrance, exit and starting of user
transactions by call in the appropriate method on the
JtaEntityManagerRegistry.
If you run into problems, don't hesitate to ask.
-dain
Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!
Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!
--
"The best insurance for tomorrow is the effective use of today.”
-- Why Smart People Do Dumb Things by Dr. Mortimer Feinberg and John
