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Thanks Maciej.

Unfortunately I don't know that much about JPA (not to say nothing except for the idea of it^^) and so on, what's behind your link looks pretty good. But it still doesn't work.

What I've done is to copy the JBPMMorm-JPA2.xml from the jbpm-persistence-jpa.jar (here) in jbpm-gwt-console-server.war#/WEB-INF/classes/META-INF and changed the persistence.xml as follows (version numbers, mapping file and TransactionManagerLookup)

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<persistence version="2.0"

             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence

                                 http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd

                                 http://java.sun.com/xml/ns/persistence/orm

                                 http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"

             xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xmlns="http://java.sun.com/xml/ns/persistence">

 

 

  <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">

    <provider>org.hibernate.ejb.HibernatePersistence</provider>

    <jta-data-source>java:jboss/datasources/jbpmDS</jta-data-source>      

    <mapping-file>META-INF/JBPMorm-JPA2.xml</mapping-file>

 

 

    <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>

    <class>org.drools.persistence.info.SessionInfo</class>

    <class>org.drools.persistence.info.WorkItemInfo</class>

 

 

    <class>org.jbpm.process.audit.ProcessInstanceLog</class>

    <class>org.jbpm.process.audit.NodeInstanceLog</class>

    <class>org.jbpm.process.audit.VariableInstanceLog</class>

 

 

    <properties>

      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>

      <property name="hibernate.max_fetch_depth" value="3"/>

      <!-- hbm2ddl.auto MUST BE update! The console will otherwise overwrite the schema with each new thread -->

      <property name="hibernate.hbm2ddl.auto" value="update" />

      <property name="hibernate.show_sql" value="false" />

 

 

      <!-- for AS7 -->

      <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.BitronixJtaPlatform" />

<!--      <property name="hibernate.transaction.manager_lookup_class" value="org.jbpm.integration.console.JBPMTransactionManager" /> -->

    </properties>       

  </persistence-unit>

   

</persistence>

I've although tried both lines of the TransactionManagerLookup and to tried with commenting the line <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class> out. But it still doesn't work. Is there anything more I just don't see?