2:09 p.m.
Fabio Wang [http://community.jboss.org/people/fabiowg] created the discussion
"Re: Drools, Spring integration and JTA in container"
To view the discussion, visit: http://community.jboss.org/message/598937#598937
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Hi there,
After some time struggling to make this "Spring + JTA + Drools" integration, I
could make it work, but I'm still unsure if it's the right way. As everyone
pointed out, the SingleSessionComand#initTransactionManager ignores the case where a
org.springframework.transaction.jta.JtaTransactionManager is used. So I had to manually
create an Environment like this:
Environment environment = EnvironmentFactory.newEnvironment();
environment.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
DroolsSpringTransactionManager jtaTransactionManager = new
DroolsSpringTransactionManager(ptm);
this.environment.set(EnvironmentName.TRANSACTION_MANAGER, jtaTransactionManager);
DroolsSpringJpaManager pcm = new DroolsSpringJpaManager(environment);
environment.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, pcm);
And, after that, I create my ksession (unfortunately, without the <drools:ksession/>
shortcut):
ksession = JPAKnowledgeService.newStatefulKnowledgeSession(this.kbase, null,
environment);
Hope this helps.
Fábio
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2:55 a.m.
Alex Manly [http://community.jboss.org/people/alexmanly] created the discussion
"Re: Drools, Spring integration and JTA in container"
To view the discussion, visit: http://community.jboss.org/message/599113#599113
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Hi Fabio
Thanks for taking the time to respond.
Can you please tell me what the object type is for your attribute: "ptm".
I assume it is this object type:
org.springframework.transaction.jta.JtaTransactionManager
Also, I am using Drools version 5.1 and the Class EnvironmentName does not have a static
field named:
EnvironmentName.PERSISTENCE_CONTEXT_MANAGER
What should I use instead of that field?
Kind regards
Alex
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6:33 a.m.
Fabio Wang [http://community.jboss.org/people/fabiowg] created the discussion
"Re: Drools, Spring integration and JTA in container"
To view the discussion, visit: http://community.jboss.org/message/599191#599191
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Hi,
I've just noticed that the code of initTransactionManager you sent was a bit different
from the one I was analyzing. I'm using Drools version 5.2.0.M1.
In fact, there doesn't seem to be a way to pass a PersistenceContextManager through
the environment in version 5.1.x. So I think the easiest way to make it work would be to
subclass the SingleSessionCommandService, override the initTransactionManager, where you
would lookup the transactionManager in the environment using any key you like), and then
manually instantiate a CommandBasedStatefulKnowledgeSession.
I just came up with this idea, so I don't know if it works at all.
(By the way, ptm is supposed to be the spring PlatformTransactionManager, so yes, it could
be a JtaTransactionManager).
What a mess, huh?
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7:34 a.m.
Alex Manly [http://community.jboss.org/people/alexmanly] created the discussion
"Re: Drools, Spring integration and JTA in container"
To view the discussion, visit: http://community.jboss.org/message/599210#599210
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Hi,
I have managed to get the spring context to load by overriding the
SingleSessionCommandService as you mentioned. Here is my code:
public void initTransactionManager(Environment env) {
Object tm = env.get( EnvironmentName.TRANSACTION_MANAGER );
if ( tm != null && tm.getClass().getName().equals(
"org.springframework.transaction.jta.JtaTransactionManager" ) ) {
logger.debug( "Instantiating Spring JtaTransactionManager" );
this.txm = new
JtaTransactionManager(((org.springframework.transaction.jta.JtaTransactionManager)tm).getUserTransaction(),
env.get(
EnvironmentName.TRANSACTION_SYNCHRONIZATION_REGISTRY ),
((org.springframework.transaction.jta.JtaTransactionManager)tm).getTransactionManager() );
this.jpm = new DefaultJpaManager(this.env);
} else {
// continue as normal
}
I agree.....very messy. Thanks for your help.
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8:07 p.m.
rodri tes23 [http://community.jboss.org/people/rodri] created the discussion
"Re: Drools, Spring integration and JTA in container"
To view the discussion, visit: http://community.jboss.org/message/599397#599397
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Hi Alex Manly:
Could you please share the final configuration files?
Also when you say 'overriding the SingleSessionCommandService', is it better to
modify 'org.drools.persistence.session.SingleSessionCommandService' class and
repackage the drools-persistence-jpa.jar file instead.
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rodri tes23