[rules-users] [droolsflow] JPAVariablePersister Crashing SQL Server RPC?

[Bill Tarr]

Hi Mauricio,

I don't actually have a stack trace. Every time I've run the test, it has completed without errors exactly once.  

There is nothing in the stack indicating anything bad happened, but immediately after SQL Server is unresponsive to any clients.

As to Hibernate Mappings, you are ahead of me already.  

I am currently testing with annotated JPA entities (for Claims and Role) which mirror my real Hibernate mapped entities.

I've haven't found anything absolute on this, but think you CAN'T use Hibernate mappings within JPA.

That means we will need a new Variable Persister, but presumably one similar to the JPA Persister.

I'll be testing more today, as I'll can and let you know if my DBA can get any more info to see if SQL Server is telling us anything useful.

Thanks!  And great work on the variable persister, the timing was perfect for us!

Bill




________________________________
From: Mauricio Salatino <salaboy at gmail.com>
To: Rules Users List <rules-users at lists.jboss.org>
Sent: Fri, October 16, 2009 4:41:46 AM
Subject: Re: [rules-users] [droolsflow] JPAVariablePersister Crashing SQL Server RPC?

HI Bill,
Can you paste here the full stack trace?
I don't test it in SQL Server, but if the problem persist I'm interested in solve it.
Some thoughts:
1) does JPA take the Hibernate Mappings as JPA entities without adding them at the persistence.xml file?, I think yes, but I'm not sure
2) if not, probably we need to create a new persister for hibernate mapped entities.



On Thu, Oct 15, 2009 at 9:26 PM, Bill Tarr <javatestcase at yahoo.com> wrote:

Has anyone successfully used JPAVariablePersister on Sql Server?  The quick hits are we are running MSSQL 2008, and after introducing JPAVariablePersister (which is described very well in http://blog.athico.com/2009/09/drools-flow-variable-persistence.html) every time I run my test case, the DB becomes non-responsive, returning from any JDBC pings:
>
>    java.sql.SQLException: I/O Error: DB server closed connection.
>
>You can't even connect through MSSQL Management Studios, looks like RPC service has gone down.  Haven't been able to do much troubleshooting yet (slow going when you need to get a DBA to reboot your sever every time.)
>
>I've already tested out the JPAKnowledgeService with some success.  Setting up my session with the following code,  I can see the SessionInfo, ProcessInstanceInfo, ProcessInstanceInfo_eventTypes tables storing data, looks pretty solid, and I can grab the processes again.
>
>    EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa");
>    env = KnowledgeBaseFactory.newEnvironment();
>    env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
>    session = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);
>
>    Map<String, Object> parameterMap = new HashMap<String, Object>();
>    parameterMap.put("claim", claim);
>    processInstance = session.startProcess(CLAIMS_DEMO, parameterMap);
>
>I want to store my variable separately though, as we already have them as Hibernate DTOs.  So I added the following code, as well as adding JPAVariablePersister to my persistence.xml.
>
>    VariablePersistenceStrategyFactory.getVariablePersistenceStrategy()
>            .setPersister("javax.persistence.Entity",
>                    "org.drools.persistence.processinstance.persisters.JPAVariablePersister");
>
>The code appears to run through.  This time, I can see data in  the SessionInfo, ProcessInstanceInfo, ProcessInstanceInfo_eventTypes tables, as well as additional data in VariableInstanceInfo, and my two entities (Claim, which has a List of Role.)  The data looks pretty good, and my process logs hit the expected nodes.
> 
>Anyway, I'll post more as I learn it.  Let me know if anyone else is running into this.
> 
>Thanks!
> 
>Bill
>
>
>
>
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- Salatino "Salaboy" Mauricio -



      
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