[rules-users] Drools 6 Spring JTA Persistence

Wed Sep 4 15:19:42 EDT 2013

If you don't mind, I am also interested to share opinions and work.

Martin

2013/9/4 Alexander Herwix <alex at herwix.com>

> Hey Markus,
>
> that sounds really interesting! I would love to know your opinion on how
> to integrate grails and drools in the best way. If we have similar ideas
> and goals for the plugin that would be really good way to proceed. Maybe we
> can set up a talk in irc or the like? I'm currently working on this full
> time so just hit me up on my mail address to set something up.
>
> Cheers, Alex
>
> Am 04.09.2013 um 19:44 schrieb Markus Schneider <
> markus.schneider73 at gmail.com>:
>
> Hi Alex,
>
> I'm developing a Grails Drools Plugin, too. At the moment I'm working on
> an ECA (Event Correlation & Analysis) solution so my current focus is on
> expert & fusion. But jBPM is also an important module that I'll need in the
> future.
> Maybe we can come togehter and create one feature rich grails plugin.
> Let me know if you're interested.
>
> Cheers
>
> -markus
>
>
>
>
>
> 2013/9/4 Alexander Herwix <alex at herwix.com>
>
>> Hey Martin,
>>
>> haven't looked at your code yet, but I have Drools 6 CR1 and 2 running in
>> grails though without local HT and JTA persistence. It was pretty straight
>> forward, just included the dependencies and pruned duplicate entries (check
>> the dependency report).
>>
>> If I get the plugin working I would be glad to share a demo project.
>> However, I think that a fully fledged release of the plugin to grails
>> central would take some more time.
>>
>> Cheers, Alex
>>
>> Am 03.09.2013 um 21:23 schrieb Martin Minka <martin.minka at gmail.com>:
>>
>> 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
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
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