 103 | JPA 2 supports both optimistic locking and pessimistic locking. Locking is essential to avoid ... to pessimistic locking it is easier to use and more efficient. In the rare cases in which update collision must be revealed earlier (before transaction commit) pessimistic locking can be used. When using |
95 | Enum Constant javax.persistence.LockModeType PESSIMISTIC_FORCE_INCREMENT Pessimistic write lock, with version update. Since: JPA 2.0 |
95 | Enum Constant javax.persistence.LockModeType PESSIMISTIC_READ Pessimistic read lock. Since: JPA 2.0 |
95 | Enum Constant javax.persistence.LockModeType PESSIMISTIC_WRITE Pessimistic write lock. Since: JPA 2.0 |
42 | . JPA 2 adds support for pessimistic locking. The setLockMode method sets a lock mode ... execution sets a pessimistic WRITE lock on all the result objects:
List results =
query.setLockMode(LockModeType.PESSIMISTIC_WRITE)
.getResultList(); Notice that when a query |
34 | ) - and my test case is failing here. The issue is that once the pessimistic lock is in place ... the meantime, I'll use an optimistic lock and fail on stale updates. Support of pessimistic lock timeout ... for com.x.y.z.ProductCodeTracking:1
I have to stress, that the pessimistically locked entity |
33 | It appears that EntityTransaction.commit() does not release a pessimistic lock -> test code ... ();
Account a1 = em1.find(Account.class, 0, LockModeType.PESSIMISTIC_WRITE);
a1.credit(10);
em1.getTransaction().commit();
System.out.println(em1.getLockMode(a1)); // -> PESSIMISTIC_WRITE |
31 | I've attached a simple test which creates an object then kicks off several threads which each try to update the object. I'm using a pessimistic lock with timeout as follows:
MapPESSIMISTIC_WRITE, properties |
29 | ). Implicit pessimistic locking (JDO). Explicit pessimistic locking (JPA 2). Always Object Level locking. Lock modes: READ/WRITE, OPTIMISTIC/PESSIMISTIC. Database Tools and Utilities ObjectDB provides |
29 | ). Implicit pessimistic locking (JDO). Explicit pessimistic locking (JPA 2). Always Object Level locking. Lock modes: READ/WRITE, OPTIMISTIC/PESSIMISTIC. Database Tools and Utilities ObjectDB provides |