@Entity
@Indexed
@NamedQueries({
   @NamedQuery(name = "user.getUsers", query = "select u from User u")
})
@Table(name = "user")
public class User {

   private static final transient Logger LOG = LoggerFactory.getLogger(User.class);

   
   @Id
   @GeneratedValue(generator = "uuid")
   @GenericGenerator(name = "uuid", strategy = "uuid2")
     public String id;

   @Column(name = "first_name", nullable = false)
   @Field(analyze = Analyze.NO)
   private String firstName;

   @Field(analyze = Analyze.NO)
   @Column(name = "last_name", nullable = false)
   private String lastName;

   public User() {
   }
   
   public int compareTo(User o) {
      return 0;
   }
   

   public String getId() {
          return id;
     }

     public void setId(String id) {
        this.id = id;
     }
   
   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String lastName) {
      this.lastName = lastName;
   }

@Named
public class UserDao {
   
   protected EntityManagerFactory emf = Persistence.createEntityManagerFactory("mongo-hibernate");

   protected EntityManager entityManager = emf.createEntityManager();
   
   public List<User> getUsers() {
      TypedQuery<User> namedQuery = entityManager.createNamedQuery("user.getUsers", User.class);
      
          return namedQuery.getResultList();
     }   


}

<property name="hibernate.transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory​"/>

<property name="hibernate.transaction.factory_class" value="org.hibernate.ogm.transaction.impl.JTATransactionManagerTransactionFactory"/>

@Transactional(readOnly = false, propagation = Propagation.REQUIRED)

Session session = entityManager.unwrap(Session.class);         
Transaction tx = session.getTransaction(); 
tx.begin();
.....