[rules-users] Drools 6 Spring JTA Persistence

[Martin Minka]

Alex,
I am sorry, I don't have solution for your problem, but maybe I will work
soon on same issue.
Are you using Drools 6.0.0.CR2 ? If yes, where you able to overcome this
problem
http://drools.46999.n3.nabble.com/rules-users-classloader-problem-in-Drools-6-0-0-CR1-and-CR2-working-in-Beta5-td4025726.html?

Do you mind to share your plugin code with community ?

Best regards,
Martin



2013/9/3 Alexander Herwix <alex at herwix.com>

> Hey guys,
>
> I'm working on a Grails plugin for Drools/Jbpm 6 and I have trouble to get
> persistence working in a user friendly way. It would be awesome if someone
> with a better understanding of drools and especially drools spring
> integration could help me to figure this out :)
>
> I have considered multiple approaches:
>
> - Use a spring LocalContainerEntityManagerFactoryBean with a local
> JpaTransactionManager to configure a KieEnvironment via Spring.
>
> I basically got this working, but this doesn't provide real integration
> with Grails, as there are 2 seperate local TransactionManagers involved -
> limiting the ability to integrate drools in the grails app.
>
> - Use JTA-Transactions.
>
> As I want the plugin to be as user friendly as possible I would like to
> keep using the default tomcat container for development. There is the
> Atomikos Plugin for Grails which configures Grails to work with JTA. This
> works pretty nicely and should suffice for the development environment.
>
> My problem is integrating the Atomikos backed JTATransactionManager with
> the drools 6 spring environment configuration as I have not much experience
> with JTA. I have looked at the Tests for Kie-Spring and looked at as much
> documentation as I could find, but I can't seem to figure this out.
>
> This is what I use to configure the environment via spring (in Grails
> groovy syntax)
>
> jbpmGlobals(MapGlobalResolver)
>
>     dacceptor(ClassObjectMarshallingStrategyAcceptor,['*.*'])
>
>     kie.kstore(id:'kiestore')
>
>     kie.environment(id: 'jbpmEnv'){
>         kie.'entity-manager-factory'(ref:'entityManagerFactory')
>
>         kie.globals(ref:'jbpmGlobals')
>
>         kie.'object-marshalling-strategies'(){
>             kie.'jpa-placeholder-resolver-strategy'()
>
> kie.'serializable-placeholder-resolver-strategy'('strategy-acceptor-ref':"dacceptor")
>         }
>     }
> //Tried to wrap my JtaTransactionManager with KieSpringTransactionManager
> jbpmTransactionManager(KieSpringTransactionManager,
> ref('transactionManager'))
>
>
> the environment value for transactionManager cannot be set here, because
> the parser expects a JpaTransactionManager. I tried to add the
> transactionManager manually to the environment and found the
> KieSpringTransactionManager, which looked like it could help me somehow,
> but in the end, there is always the default implementation of the
> JtaTransactionManager used which can't find the transactionManager that I
> configured.
>
> Error:
> NamingException occurred when processing request: [GET] /bpm/test/testJbpm
> Cannot create resource instance. Stacktrace follows:
> javax.naming.NamingException: Cannot create resource instance
> at
> org.apache.naming.factory.TransactionFactory.getObjectInstance(TransactionFactory.java:116)
> at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:843)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:154)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:831)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:168)
> at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158)
> at javax.naming.InitialContext.lookup(InitialContext.java:411)
> at
> org.drools.persistence.jta.JtaTransactionManager.findUserTransaction(JtaTransactionManager.java:122)
> at
> org.drools.persistence.jta.JtaTransactionManager.<init>(JtaTransactionManager.java:69)
> at
> org.drools.persistence.SingleSessionCommandService.initTransactionManager(SingleSessionCommandService.java:325)
> at
> org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:114)
> at
> org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:129)
> at
> org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:67)
> at
> org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:36)
> at bpm.TestController.testJbpm(TestController.groovy:119)
> at
> grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:200)
> at
> grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:722)
>
>
> I would be glad about any input.
>
> Cheers, Alex
>
>
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