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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

adds support for pessimistic locking . The setLockMode method sets a lock mode that has to be applied ... a pessimistic WRITE lock on all the result objects:   List results = query. setLockMode ( LockModeType . PESSIMISTIC _WRITE ) . getResultList (); Notice that when a query is executed

index) - and my test case is failing here. The issue is that once the pessimistic lock is in place ... on stale updates. Willks William Support of  pessimistic lock timeout setting ( javax.persistence ... .ProductCodeTracking:1 I have to stress, that the pessimistically locked entity has a transaction

It appears that EntityTransaction.commit() does not release a pessimistic lock - test code ... .getTransaction().begin(); Account a1 = em1.find(Account.class, 0, LockModeType. PESSIMISTIC _WRITE); a1.credit(10); em1.getTransaction().commit(); System.out.println(em1.getLockMode(a1)); // - PESSIMISTIC

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _FORCE_INCREMENT Pessimistic write lock, with version update. Since: JPA 2.0

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _WRITE Pessimistic write lock. Since: JPA 2.0

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _READ Pessimistic read lock. Since: JPA 2.0

Pessimistic lock

and the lock mode type is pessimistic and the entity has a version attribute, the persistence ... , the OptimisticLockException will be thrown. If the lock mode type is pessimistic and the entity ... PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException

pessimistic locks. Optimistic locks are specified using LockModeType.OPTIMISTIC and LockModeType ... call, it must throw the PersistenceException . The lock modes LockModeType. PESSIMISTIC _READ , LockModeType. PESSIMISTIC _WRITE , and LockModeType. PESSIMISTIC _FORCE_INCREMENT are used to immediately obtain long

- since someone can change the object just after the refresh . In that case - use pessimistic locks. support ... - since someone can change the object just after the refresh. In that case - use pessimistic locks ... , so that doesn't help me. Pessimistic locks might not help either, given #3 above, ie: it seems like

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: Map properties = new ... .class, 1, LockModeType. PESSIMISTIC _WRITE, properties); One thread manages to do its update

to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled ... has not been joined to the transaction PessimisticLockException - if pessimistic locking fails

PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled back PersistenceException - if the query ... to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled

pessimistic locking only? I've tried various xml configurations, and also various transaction ... , that setting is for optimistic locking. My question was about pessimistic locking (specifically, pessimistic write locking). Your documentation seems unclear about that.   dmoshal David Moshal

and with specified properties. If a pessimistic lock mode type is specified and the entity contains a version ... is pessimistic and the entity instance is found but cannot be locked: the PessimisticLockException ... transaction EntityNotFoundException - if the entity does not exist in the database when pessimistic

the persistence context with the specified lock mode type. If a pessimistic lock mode type is specified ... will be thrown. If the lock mode type is pessimistic and the entity instance is found but cannot be locked ... transaction EntityNotFoundException - if the entity does not exist in the database when pessimistic

is pessimistic and the entity has a version attribute, the persistence provider must perform optimistic ... will be thrown. If the lock mode type is pessimistic and the entity instance is found but cannot be locked ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking

there. If the entity is found within the persistence context and the lock mode type is pessimistic and the entity ... mode type is pessimistic and the entity instance is found but cannot be locked ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic

; support Support A possible solution (which is currently not implemented) is to use pessimistic locking ... want to use Pessimistic Lock as a way of enforcing a cluster wide singleton of services, a pessimistic ... adds automatic release of pessimistic locks on client-server disconnection. The locks

is pessimistic and the entity instance is found but cannot be locked: the PessimisticLockException will be thrown ... EntityNotFoundException - if the entity no longer exists in the database PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

. If the lock mode type is pessimistic and the entity instance is found but cannot be locked ... EntityNotFoundException - if the entity no longer exists in the database PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

.getSelectedValue(),       LockModeType. PESSIMISTIC _WRITE); . . } //doEdit ... , LockModeType. PESSIMISTIC _WRITE);         System.out.println ... ;      em.lock(p, LockModeType. PESSIMISTIC _WRITE);     

. Also have the Explorer open Questions: a) what is it about? b) is there a setting for pessimistic mode? In my app ... guess I should read doco more. I ran into the same error from a pessimistically locked entity (global ... on pessimistically tracked entity.   Modified conf file, and got the test case working perfectly.  

JPA Enum PessimisticLockScope java.lang.Object ∟  java.lang.Enum ∟  javax.persistence.PessimisticLockScope Defines the values of the javax.persistence.lock.scope property for pessimistic ... for pessimistic locking. The persistence provider must lock the database row(s) that correspond

the persistence context has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

- if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking

been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement

- if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking

the persistence context has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement

. ObjectValue ID:=100, TYPE:=Person, REVISION:=0, isPersisted:=true, LockMode:= PESSIMISTIC _WRITE ... . ObjectValue ID:=100, TYPE:=Person, REVISION:=2, isPersisted:=true, LockMode:= PESSIMISTIC _WRITE

Is it possible to change a LockTimeout for  pessimistic  lock? glaz Alexandr Kurucin Currently ObjectDB throws a LockTimeoutException immediately when a pessimistic lock cannot be granted. Future versions will support timeout setting. You may fill a feature request to increase the priority of this feature.   support Support

JPA Enum Constant in javax.persistence.PessimisticLockScope NORMAL This value defines the default behavior for pessimistic locking. The persistence provider must lock the database row(s) that correspond to the non-collection-valued persistent state of that instance. If a joined inheritance

when EntityManager.lock is used with pessimistic locking is used and the entity no longer exists in the database

JPA Exception LockTimeoutException java.lang.Object ∟  java.lang.Throwable ∟  java.lang.Exception ∟  java.lang.RuntimeException ∟  javax.persistence.PersistenceException ∟  javax.persistence.LockTimeoutException Thrown by the persistence provider when an pessimistic

when an pessimistic locking conflict occurs. This exception may be thrown as part of an API call, a flush or at commit

pessimistic exceptions, but it is more efficient to remain with optimistic locking (which is the default

? Yes, if it has not been locked with pessimistic WRITE. , and will it see the old attribute? Yes

pessimistic locking (datastore transaction) is used. The default in ObjectDB is false , indicating

Added support of JPA UPDATE and DELETE queries ( issue #12 ). Added support of pessimistic lock timeout ( javax.persistence.lock.timeout ). Added implementation of the getParameters method. Added exception on pessimistic locking retrieval with no active transaction. Improved support of entity

Added JPA XML validation schema files to Maven/JEE objectdb.jar. Added automatic release of pessimistic locks on client-server connection failure. Fixed an OptimisticLockException bug on commit after flushing a removed modified entity object. Fixed a  NullPointerExeption on new index building

O'Hare It seems as a separate issue. Maybe related to pessimistic locking. Can you provide a test

instead of Long ) and then updated. Fixed retrieval with pessimistic lock to bypass cache and to force refresh.

UnsupportedOperationException  error message. Fixed a pessimistic lock timeout bug ( issue #520 ). Fixed

and LockMode set to PESSIMISTIC _WRITE. This results in the exceptions below. Could you advise on the errors

Added support for using ObjectDB with JBoss AS 6.0 / 6.1 . Fixed several bugs in handling eager fetch. Fixed a pessimistic locking bug . Fixed a bug in using primary key fields in queries. Fixed a bug in queries on deleted objects before commit / flush.

however, married to JDO, although I think it's good. Its lack of true (before commit) pessimistic locking

Fixed a bug in using AS in SELECT NEW (breaks some Spring Data JPA queries). Fixed a bug in tracking changes to new collections after flush ( issue #2640 ). Fixed a StackOverflowError on no access permission to objectdb.conf ( issue #2643 ). Fixed a bug in managing pessimistic locks after using