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

    }
    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.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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    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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                    }
                    employee = employees.get(id);
                    log.trace("Employee=" + employee);
                    Map<String, Object> lockProps = buildPropsMap(args, 3);
                    if (lockProps != null) {
                        em.lock(employee, lockMode, lockProps);
                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:

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                    log.trace("Employee=" + employee);
                    Map<String, Object> lockProps = buildPropsMap(args, 3);
                    if (lockProps != null) {
                        em.lock(employee, lockMode, lockProps);
                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:
                    em.lock(args[1], (LockModeType) args[2]);
                    break;

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                    } else {
                        em.lock(employee, lockMode);
                    }
                    break;
                case LockObject:
                    em.lock(args[1], (LockModeType) args[2]);
                    break;
                case UpdateEmployee:
                    id = 1;
                    if (args.length > 1) {
                        id = (Integer) args[1];

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                case Trace:
                    log.trace(args[1]);
                    break;


                case Test:
                    em.lock("xxx", LockModeType.WRITE);
                    break;
                default:
                }
            } catch (Exception ex) {
                // only remember the first exception caught

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  public static Item load(String siteId, Long itemId, LockModeType lockModeType) throws SecurityException, Exception {
      EntityManager em = JpaConnection.getInstance().getCurrentEntityManager();
      Item item = (Item) em.find(Item.class, itemId);
      if (lockModeType != null) {
        em.lock(item, lockModeType);
      }
      if (item != null) {
      if (!item.getSiteId().equals(siteId)) {
        throw new SecurityException();
      }

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      int shipQty = shipDetail.getItemShipQty();
      
      Item item = shipDetail.getOrderItemDetail().getItem();
      if (item != null) {
        item = (Item) em.find(Item.class, item.getItemId());
        em.lock(item, LockModeType.WRITE);
      
        InventoryEngine engine = new InventoryEngine(item);
        engine.adjustQty(shipQty * -1);
        engine.adjustBookedQty(shipQty * -1);
      }

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