About pessimistic

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JPA Doc
5

javax.persistence.PessimisticLockException

Interfaces: Serializable Thrown by the persistence provider when an pessimistic locking conflict occurs
JPA Doc
5

PessimisticLockScope.NORMAL

Enum Constant 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 strategy
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3

Pessimestic Locking doesn't release when application unexpectedly terminates.

) is to use pessimistic locking with expiration time. For example, if you know that transactions ... is broken. Hi Since I want to use Pessimistic Lock as a way of enforcing a cluster wide singleton of services, a pessimistic lock will potentially last forever or until the particular service goes
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3

"Attempt to lock a non entity object" error

(),       LockModeType.PESSIMISTIC_WRITE); . . } //doEdit ... );         em.lock(p, LockModeType.PESSIMISTIC_WRITE);         System.out.println("After find ... ();         // next line throws IllegalArgumentException         em.lock(p, LockModeType.PESSIMISTIC
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3

OptimisticLockException

. Also have the Explorer open Questions: a) what is it about? b) is there a setting for pessimistic mode? In my app, I ... a pessimistically locked entity (global tracking id generator, specific to internal requirement) - and got ... Optimistic lock error on pessimistically tracked entity.   Modified conf file, and got the test case
Result
2

ObjectDB version 2.2.4

Version 2.2.4 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
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2

Database Inconsistency or corruption

. ObjectValue ID:=100, TYPE:=Person, REVISION:=0, isPersisted:=true, LockMode:=PESSIMISTIC_WRITE ... :=100, TYPE:=Person, REVISION:=2, isPersisted:=true, LockMode:=PESSIMISTIC_WRITE]] ... Attribute  ID
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2

How to do multithreading with embedded ObjectDB

/ JPA locking, by setting a pessimistic locking timeout, e.g. by: MapPESSIMISTIC_WRITE);         point.setX(point.getX() + 1);   johnvu
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2

javax.persistence.LockTimeoutException

Is it possible to change a LockTimeout for pessimistic lock? 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.   glaz
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1

ObjectDB version 2.2.1

Version 2.2.1 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.