private static SessionFactory buildSessionFactory() {
      try {
         // Create the SessionFactory from hibernate.cfg.xml
         Configuration c = new Configuration();
         c.configure("wwwhibernate.cfg.xml");
         c.addAnnotatedClass(tab1.class);
         c.addAnnotatedClass(tab2.class);
   
         
         return c.buildSessionFactory();
      } catch (Throwable ex) {
         // Make sure you log the exception, as it might be swallowed
         System.err.println("Initial SessionFactory creation failed." + ex);
         throw new ExceptionInInitializerError(ex);
      }
   }

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_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>jdbc/testDS1</jta-data-source>
      <mapping-file>META-INF/orm.xml</mapping-file>
        <class>org.drools.persistence.info.SessionInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</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.Task</class>
      <class>org.jbpm.task.Comment</class>
      <class>org.jbpm.task.Attachment</class>
      <class>org.jbpm.task.I18NText</class>
      <class>org.jbpm.task.SubTasksStrategy</class>
      <class>org.jbpm.task.Deadline</class>
      <class>org.jbpm.task.Escalation</class>
      <class>org.jbpm.task.Reassignment</class>
      <class>org.jbpm.task.Notification</class>
      <class>org.jbpm.task.BooleanExpression</class>
      <class>org.jbpm.task.User</class>
      <class>org.jbpm.task.PeopleAssignments</class>
        <properties>
           

            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
            <property name="hibernate.connection.autocommit" value="false"/>
            <property name="hibernate.max_fetch_depth" value="3"/>

            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup"/>
           
           
        </properties>
     
     
    </persistence-unit>
    <persistence-unit name="org.jbpm.task">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
       
        <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>

        <class>org.drools.persistence.info.SessionInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>
        <class>org.drools.persistence.info.WorkItemInfo</class>
       

        <properties>
             <!-- sample MySQL configuration  -->
             
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jbpm5db" />
            <property name="hibernate.connection.username" value="test1"/>
            <property name="hibernate.connection.password" value="test1"/>
         

           
            <property name="hibernate.connection.autocommit" value="false" />
            <property name="hibernate.max_fetch_depth" value="3"/>
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true" />
        </properties>
    </persistence-unit>
   
<!--     <persistence-unit name="hibernatetest" transaction-type="RESOURCE_LOCAL"> -->
<!--         <provider>org.hibernate.ejb.HibernatePersistence</provider> -->


<!--         <properties> -->
           
<!--              H2 dialect -->
             
<!--             <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/> -->
             
<!--          <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/HibernateTest"/> -->
<!--          <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/> -->
<!--          <property name="hibernate.connection.password" value="test1"/> -->
<!--          <property name="hibernate.connection.username" value="test1"/> -->


<!--             <property name="hibernate.connection.autocommit" value="false"/> -->
<!--             <property name="hibernate.max_fetch_depth" value="3"/> -->
<!--             <property name="hibernate.hbm2ddl.auto" value="create" /> -->
<!--             <property name="hibernate.show_sql" value="true" /> -->
<!--             <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup"/> -->
<!--         </properties> -->
     
     
<!--     </persistence-unit>    -->
   



   
</persistence>