On 01/11/2010 19:05, tizo wrote:
On Mon, Nov 1, 2010 at 4:21 PM, Mark Proctor <[email protected]
<mailto:[email protected]>> wrote:
On 01/11/2010 15:31, tizo wrote:
On Wed, Oct 27, 2010 at 5:21 PM, tizo <[email protected]
<mailto:[email protected]>> wrote:
Hi there,
I have seen in chapter 6 of the documentation, that Drools
Flow can be configured to use JPA and transactions to persist
the running states. However, I am in a EJB where I obtain
entity managers with a @PersistenceContext annotation, and
the transactions are managed by the container, whereas in the
example an EntityManagerFactory and a TransactionManager are
used.
Could I configure Flow in a direct way to be used by my EJB?
Thanks very much,
tizo
Ok, looking at the code, I guess that Drools flow is not ready to
work with standards EJBs. The reasons are the following:
* The JPA annotations are not standard JPA annotations, but
hibernate ones. For example "CollectionOfElements" in
ProcessInstanceInfo class.
That was the one element we couldn't find a replacement for in
JPA1, JPA2 fixes this, but we haven't updated to JPA2 yet. I don't
believe we use any other hibernate specific annotations.
* Transactions are managed by Drools, as opposed to some EJBs
where transactions are managed by the container.
You can use both JTA transactions and local entity transactions.
So transactions can be drools maintained or container/external
maintained.
As for that, I will probably modify the codes, so Flow could be
used in our EJBs. I would like to know if someone could guide me
on what should I modify.
I will post the modifications in case they are of interest to
someone.
Thanks very much,
tizo
Mark,
Thanks for your response. Could you tell me how can I use Drools with
my container managed transactions, or where can I read how to do
that?. I think that the example given in the documentation (Drools
Flow, 6.1.4 - Transactions) does not apply to this case, and I can't
figure out how to do it.
Shows configuring a JTA transaction here:
http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/javadocs/stable/drools-api/org/drools/persistence/jpa/JPAKnowledgeService.html
Mark
Thanks again,
tizo
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