9.28. Configuring JPA

To enable persistence several classes must be added to your persistence.xml, as in the example below: 
<persistence-unit name="org.drools.persistence.jpa" transaction-type="JTA">
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
   <jta-data-source>jdbc/BitronixJTADataSource</jta-data-source>       
   <class>org.drools.persistence.session.SessionInfo</class>
   <class>org.drools.persistence.processinstance.ProcessInstanceInfo</class>
   <class>org.drools.persistence.processinstance.ProcessInstanceEventInfo</class>
   <class>org.drools.persistence.processinstance.WorkItemInfo</class>
   <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>            
         <property name="hibernate.max_fetch_depth" value="3"/>
         <property name="hibernate.hbm2ddl.auto" value="update" />
         <property name="hibernate.show_sql" value="true" />
         <property name="hibernate.transaction.manager_lookup_class"
                      value="org.hibernate.transaction.BTMTransactionManagerLookup" />
   </properties>
</persistence-unit>
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