<persistence-unit name="HibernatePU">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.archive.autodetection"   value="class, hbm"/>
            <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>
            <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:XE"/>
            <property name="hibernate.connection.username" value="zoran"/>
            <property name="hibernate.connection.password" value="zoran"/>
            <!-- <property name="hibernate.show_sql" value="false"/> -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
        </properties>
</persistence-unit>

private EntityManagerFactory EntityManagerFactoryM = Persistence.createEntityManagerFactory("HibernatePU");

private EntityManager EntityManagerMesto;

EntityManagerMesto = EntityManagerFactoryM.createEntityManager();


    private void Transaction()
    {
        Mesto mestoTB = EntityManagerMesto.find(Mesto.class,1);
     
        EntityTransaction transactionM = EntityManagerMesto.getTransaction();
     
        transactionM.begin();     
           
        EntityManagerMesto.lock(mestoTB, LockModeType.WRITE);
     
        System.out.println("testEJB: " + mestoTB.getNaziv());
        }
       

       Private void ExitForm()
       {
          transactionM.rollback();
        }