About optimistic
Locking in JPA
Explains how to use optimistic locking and pessimistic locking in JPA. JPA 2 supports both optimistic locking and pessimistic locking . Locking is essential to avoid ... i.e. each database object is locked separately. Optimistic locking is applied on transaction commit. Any database object that ... by another transaction. When using ObjectDB, optimistic locking is enabled by default and fully automatic. Optimistic ...
Advanced JPA Topics
Describes advanced JPA topics - detached entity objects, lock management and entity lifecycle events. This section discusses advanced JPA topics: Detached Entity Objects Locking in JPA JPA Lifecycle Events Shared (L2) Entity Cache JPA Metamodel API ...
Optimistic Locking
We are having problems with optimistic locking. I made a simple test case to try to induce an optimistic lock.... We are having problems with optimistic locking. I made a simple test case to try to induce an optimistic lock. I have two users logged on to our system. They both read ...
Optimistic lock failed
Hi, I frequently see exceptions during development such as com.objectdb.o._RollbackException: Failed to commit transaction: Optimistic lock failed for object com.example.MyEntity#3 (object has version 1 instead of 3) Could you please explain what this means, and what I can do about it. Thanks you, Carl ... Failed to commit transaction: Optimistic lock failed for object com.example.MyEntity#3 (object has version 1 ... If you must avoid optimistic lock exceptions you can use pessimistic exceptions, but it is more efficient to remain with optimistic locking (which is the default) and just handle these exceptions. ...
Optimistic locking failure
Optimistic locking failure: I am using a Semaphore to force this execution of concurrents transactions T1 and T2 that cause parallel updates to A/B but it does not throw an OptimisticLockException and roll back. ... 2012-04-30 16:02 Optimistic locking failure: I am using a Semaphore to force this ... again. To support this, starting build 2.3.7_24 OPTIMISTIC (READ) is implemented as OPTIMISTIC_FORCE_INCREMENT (WRITE) ...
OptimisticLockException
Ran into this error for the first time (after many years of using odb): Caused by: com.objectdb.o._OptimisticLockException: Optimistic lock failed for object model.UserSession#28 (object has version 2 instead of 3) Also the first time I'm using odb in C/S mode rather than embedded. Also have the Explorer open Questions: a) what is it about? ... Caused by: com.objectdb.o._OptimisticLockException: Optimistic lock failed for object model.UserSession#28 (object has version 2 ... 2011-04-28 13:19 Optimistic locking is enabled by ObjectDB automatically even if no version ...
LockModeType.OPTIMISTIC_FORCE_INCREMENT
Optimistic lock, with version update.(Enum Constant of javax.persistence.LockModeType)
javax.persistence.LockModeType
Lock modes can be specified by means of passing a LockModeType argument to one of the javax.persistence.EntityManager methods that take locks (lock, find, or refresh) or to the Query.setLockMode() or TypedQuery.setLockMode() method.(Enum of JPA)
