Examples of javax.persistence.EntityManager.lock()

javax.persistence.EntityManager.lock()
Set the lock mode for an entity object contained in the persistence context. @param entity @param lockMode @throws IllegalStateException if this EntityManager has been closed @throws PersistenceException if an unsupported lock callis made @throws IllegalArgumentException if the instance is notan entity or is a detached entity @throws TransactionRequiredException if there is notransaction

    em.persist( lock );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( UnversionedLock.class, lock.getId() );
    em.lock( lock, LockModeType.READ );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( UnversionedLock.class, lock.getId() );
    em.remove( lock );

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        final Object entity2 = em2.find(entityClass, oid);
        final long timeout = 1000;
        try {
            Map<String,Object> hint = new HashMap<String, Object>();
            hint.put("javax.persistence.lock.timeout", timeout);
            em2.lock(entity2, LockModeType.PESSIMISTIC_WRITE, hint);
            fail("Expected " + PessimisticLockException.class.getName());
        } catch (Throwable t) {
           assertError(t, PessimisticLockException.class);
        }
        assertTrue(em2.getTransaction().isActive());

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  public void lock(Object entity, LockModeType lockMode)
  {
    EntityManager em = getCurrent();
    
    if (em != null) {
      em.lock(entity, lockMode);
      return;
    }
    
    em = createEntityManager();

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    }
    
    em = createEntityManager();
    
    try {
      em.lock(entity, lockMode);
    } finally {
      freeEntityManager(em);
    }
  }

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                   Map<String, Object> properties)
  {
    EntityManager em = getCurrent();
    
    if (em != null) {
      em.lock(entity, lockMode, properties);
      return;
    }
    
    em = createEntityManager();

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    }
    
    em = createEntityManager();
    
    try {
      em.lock(entity, lockMode, properties);
    } finally {
      freeEntityManager(em);
    }
  }

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    em.persist( lock );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    em.lock( lock, LockModeType.READ );
    lock.setName( "surname" );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.find( Lock.class, lock.getId() );

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    }
    catch (TransactionRequiredException e) {
      //success
    }
    try {
      em.lock( book, LockModeType.READ );
      fail( "lock has to be inside a Tx" );
    }
    catch (TransactionRequiredException e) {
      //success
    }

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    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    Integer version = lock.getVersion();
    em.lock( lock, LockModeType.WRITE );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( Lock.class, lock.getId() );
    try {

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    em.persist( lock );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( UnversionedLock.class, lock.getId() );
    em.lock( lock, LockModeType.READ );
    em.getTransaction().commit();


    em.getTransaction().begin();
    lock = em.getReference( UnversionedLock.class, lock.getId() );
    em.remove( lock );

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