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Here is my persistence.xml content.

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

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

                    <jta-data-source>jdbc/processInstanceDS</jta-data-source>

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

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

                    <class>org.jbpm.task.Attachment</class>

        <class>org.jbpm.task.Content</class>

        <class>org.jbpm.task.BooleanExpression</class>

        <class>org.jbpm.task.Comment</class>

        <class>org.jbpm.task.Deadline</class>

        <class>org.jbpm.task.Comment</class>

        <class>org.jbpm.task.Deadline</class>

        <class>org.jbpm.task.Delegation</class>

        <class>org.jbpm.task.Escalation</class>

        <class>org.jbpm.task.Group</class>

        <class>org.jbpm.task.I18NText</class>

        <class>org.jbpm.task.Notification</class>

        <class>org.jbpm.task.EmailNotification</class>

        <class>org.jbpm.task.EmailNotificationHeader</class>

        <class>org.jbpm.task.PeopleAssignments</class>

        <class>org.jbpm.task.Reassignment</class>

        <class>org.jbpm.task.Status</class>

        <class>org.jbpm.task.Task</class>

        <class>org.jbpm.task.TaskData</class>

        <class>org.jbpm.task.SubTasksStrategy</class>

        <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>

        <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>

        <class>org.jbpm.task.User</class>

                    <properties>

                              <property name="hibernate.dialect" value="${hibernate.dialect}" />

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

                              <property name="hibernate.hbm2ddl.auto" value="${hibernate.hbm2ddl.auto}" />

                              <property name="hibernate.show_sql" value="${hibernate.show_sql}" />

                              <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" />

                    </properties>

          </persistence-unit>

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