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

                    }
                    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 void lock(Object o, LockModeType lockModeType) {
        EntityManager entityManager = getEntityManager(false);
        if (entityManager != null) {
             entityManager.lock(o, lockModeType);
        } else {
            entityManager = createEntityManager();
            try {
                 entityManager.lock(o, lockModeType);
            } finally {

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        if (entityManager != null) {
             entityManager.lock(o, lockModeType);
        } else {
            entityManager = createEntityManager();
            try {
                 entityManager.lock(o, lockModeType);
            } finally {
                entityManager.close();
            }
        }
    }

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        em.getTransaction().begin();
        OptimisticLockInstance oli = (OptimisticLockInstance) em.createQuery(
            "SELECT o FROM OptimisticLockInstance o WHERE o.str = 'foo'")
            .getSingleResult();
        assertNotNull(oli);
        em.lock(oli, LockModeType.READ);


        EntityManager em2 = emf.createEntityManager();
        em2.getTransaction().begin();
        em2.createQuery("UPDATE OptimisticLockInstance o SET o.str = 'foo', "
            + "o.intField = o.intField + 1"

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        EntityManager em = emf.createEntityManager();
        
        em.getTransaction().begin();
        LockEmployeeNonVersion emp = em.find(LockEmployeeNonVersion.class, 1);
        assertNotNull(emp);
        em.lock(emp, lockMode);
        String lastLastName = emp.getLastName();
        em.getTransaction().commit();
        
        em.clear();

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        emp = em.find(LockEmployeeNonVersion.class, 1);
        assertNotNull(emp);
        assertEquals(lastLastName, emp.getLastName());
        
        emp = em.find(LockEmployeeNonVersion.class, 2);
        em.lock(emp, lockMode);
        emp.setLastName(lockMode.toString());
        em.getTransaction().commit();
        
        emp = em.find(LockEmployeeNonVersion.class, 2);
        assertNotNull(emp);

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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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