[rules-users] Persistence with Drools 5.1.0.M2

[Rory Farrell]

Hi Mauricio,

Thanks for the reply.  I made some progress with the orm.xml you 
provided.  The orm.xml in the 5.1.0.M2 distribution has the named query as:

select
     processInstanceInfo.processInstanceId
from
     ProcessInstanceInfo processInstanceInfo
where
     :type in (processInstanceInfo.eventTypes.name)

I noticed that in the drools-persistence-jpa/src/test/resources/META-INF 
directory there is an orm.xml which matches the one you provided.

After replacing the orm.xml, the ruleflow process is started 
successfully.  It works correctly until it comes to a human task work 
item.  When the work item handler attempts to complete the work item it 
fails with the following exception:

java.lang.NullPointerException
	at 
org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:85)

Line 85 is:

workItemInfo = em.find(WorkItemInfo.class, id);

The JPAWorkItemManager tries to retrieve the EntityManager from the 
environment:

EntityManager em = (EntityManager) 
this.workingMemory.getEnvironment().get( EnvironmentName.ENTITY_MANAGER );

and the EntityManager is not in the environment.

The EntityManagerFactory is in the environment and I see where the 
SingleSessionCommandService class uses the factory to instantiate an 
EntityManager, but it never gets put in the environment for the 
JPAWorkItemManager to retrieve it.

If you say that the persistence works for you in 5.1.0, then I guess I 
will try using the latest snapshot.

Regards,
Rory


On 7/16/2010 6:23 PM, Mauricio Salatino wrote:
> I was looking that in the trunk but I don't see nothing strange about
> persistence there..
> I can host a project that has the persistence configuration work if you
> want.
>
> but my maven deps are:
> <dependency>
> <groupId>org.drools</groupId>
> <artifactId>drools-persistence-jpa</artifactId>
> <version>5.1.0.SNAPSHOT</version>
>
>
> </dependency>
>
> <dependency>
> <groupId>org.drools</groupId>
> <artifactId>drools-workitems</artifactId>
> <version>5.1.0.SNAPSHOT</version>
> </dependency>
>
> and in my META-INF directory I have the following orm.xml file:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
>                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>
> xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd"
>                 version="1.0">
> <named-query name="ProcessInstancesWaitingForEvent">
> <query>
> select
>      processInstanceInfo.processInstanceId
> from
>      ProcessInstanceInfo processInstanceInfo
> where
>      :type in elements(processInstanceInfo.eventTypes)
> </query>
> </named-query>
> <!--named-query name="VariableInstancesInfoByProcessId">
> <query>
> select
>      v
> from
>      VariableInstanceInfo v
> where
> v.processInstanceInfo.id <http://v.processInstanceInfo.id> = :processId
> </query>
> </named-query-->
> </entity-mappings>
>
>