How to use Atomikos Transaction Essentials with Hibernate >= 4.3

I switched from Hibernate 4.2 to Hibernate 4.3 and my project is not working any more. I'm getting an

HibernateException: Unable to locate current JTA transaction

when I do

Session s = sessionFactory.getCurrentSession();

I've realized that org.hibernate.transaction.TransactionManagerLookup does not exist any more. It was deleted in Hibernate 4.3. How should I change my current configuration?

<hibernate-configuration>
<session-factory>
    <property name="connection.datasource">testDS</property>

    <property name="current_session_context_class">jta</property>
    <property name="transaction.manager_lookup_class">com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup</property>
    <property name="transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property>
    <property name="connection.release_mode">auto</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <property name="hibernate.hbm2ddl.auto">create-drop</property>
    <property name="hibernate.show_sql">true</property>
    <mapping class="test.entities.Person" />
    <mapping class="test.entities.CreditCard" />
    <mapping class="test.entities.ExampleRevEntity" />
</session-factory>