Internal Website Search

JPA 2 supports both optimistic locking and pessimistic locking . Locking is essential to avoid ... is locked separately. Optimistic locking is applied on transaction commit. Any database object ... by another transaction. When using ObjectDB, optimistic locking is enabled by default and fully

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 and display the same ... . User 2 does not get an optimistic lock exception, so the database has user 2’s change

: Failed to commit transaction: Optimistic lock failed for object com.example.MyEntity#3 (object ... .objectdb.com/java/jpa/persistence/lock 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

Optimistic locking failure: I am using a Semaphore to force this execution of concurrents ... . Martinez You are right again. To support this, starting build 2.3.7_24  OPTIMISTIC (READ) is implemented as  OPTIMISTIC _FORCE_INCREMENT (WRITE) . This is allowed by JPA, and is required by

Hi, I seem to be getting a lot of these optimistic locking errors: Caused by: com.objectdb.o._OptimisticLockException: Optimistic lock failed for object Is there any way to force the database to use ... , that setting is for optimistic locking. My question was about pessimistic locking (specifically

JPA Enum Constant in javax.persistence.LockModeType OPTIMISTIC _FORCE_INCREMENT Optimistic lock, with version update. Since: JPA 2.0

JPA Enum Constant in javax.persistence.LockModeType OPTIMISTIC Optimistic lock. Since: JPA 2.0

.OptimisticLockException Optimistic lock failed for object entities.Record#'1405/838/2011/121 ... .java:381) ... Thank you! adibe Adi Be Optimistic locking is explained in this manual page . support Support

. The second example is an OSGi program which fails with an optimistic lock exception. Both examples ... ). Can you explain the optimistic lock exception? It seems that the first level cache contains yet a dirty entity

Hello, I have an entity E with an attribute which is a collection of entities (one to many relationship) with an optimistic locking strategy supported by a version field. Is it possible to prevent the increment of the version of entity E when entities are added to or removed from the collection

Hello When I get an optimistic lock on an object, refresh(), start trans and persist?  Will the changes made to the object before the violation be retained or must they be duplicated in the retry code?  Assuming it affects only one object.  tia. cpanon CP The exact situation

Optimistic Lock Exception With No Concurrency

attribute of the element specifies if optimistic locking is enabled. Optimistic locking is completely

is automatically increased by one. Version fields are used in conjunction with optimistic locking ... . Therefore, optimistic locking is supported by ObjectDB even when a version field is not defined

automatic optimistic locking to prevent concurrent changes to entity objects by multiple users. JPA 2

.setLockMode() or TypedQuery.setLockMode() method. Lock modes can be used to specify either optimistic or pessimistic locks. Optimistic locks are specified using LockModeType. OPTIMISTIC and LockModeType. OPTIMISTIC _FORCE_INCREMENT . The lock mode type values LockModeType.READ and LockModeType.WRITE are synonyms

provider must perform optimistic version checks when obtaining the database lock. If these checks fail ... other than NONE is specified OptimisticLockException - if the optimistic version check fails ... optimistic version checks when obtaining the database lock. If these checks fail

: properties.setProperty( "javax.jdo.option. Optimistic ", "false"); properties.setProperty( "javax.jdo.option ... by default, but ObjectDB also supports another type of transaction called optimistic transactions . When using optimistic transactions, objects are not locked. Therefore, two transactions may update

JDO Method in javax.jdo.Transaction void setOptimistic (   boolean  optimistic ) Optimistic transactions do not hold data store locks until commit time. If an implementation does not support this option, a JDOUnsupportedOptionException is thrown. Parameters: optimistic - the value of the Optimistic flag. Since: JDO 1.0

JPA Enum Constant in javax.persistence.LockModeType WRITE Synonymous with OPTIMISTIC _FORCE_INCREMENT . OPTIMISTIC _FORCE_IMCREMENT is to be preferred for new applications. Since: JPA 1.0

JPA Enum Constant in javax.persistence.LockModeType READ Synonymous with OPTIMISTIC . OPTIMISTIC is to be preferred for new applications. Since: JPA 1.0

JPA Annotation Version Target: METHOD, FIELD Implemented Interfaces: Annotation Specifies the version field or property of an entity class that serves as its optimistic lock value. The version is used to ensure integrity when performing the merge operation and for optimistic concurrency control

attribute, the persistence provider must also perform optimistic version checks when obtaining ... locking is performed OptimisticLockException - if the optimistic version check fails

and the entity contains a version attribute, the persistence provider must also perform optimistic version ... locking is performed OptimisticLockException - if the optimistic version check fails

is pessimistic and the entity has a version attribute, the persistence provider must perform optimistic ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking

has a version attribute, the persistence provider must perform optimistic version checks ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic

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

database file when the Explorer starts. Transaction type (datastore or optimistic ) on the open database

factory. This is needed for managed environments to get nontransactional connections for optimistic ... environments to get nontransactional connections for optimistic transactions. Return: the name of the data ... NontransactionalWrite setting. Since: JDO 1.0 boolean getOptimistic () Get the default Optimistic

with options and transaction demarcation. Transaction options include whether optimistic concurrency control ... () Begin a transaction. The type of transaction is determined by the setting of the Optimistic flag ... of the nontransactionalWrite property Since: JDO 1.0 boolean getOptimistic () Optimistic transactions do not hold

if flush were called, but it is not required to do so. If an optimistic transaction is active ... with the datastore and reports any exceptions. If an optimistic transaction is active, this method ... , the object returned will be enlisted in the current transaction. If called in an optimistic

JDO Method in javax.jdo.PersistenceManagerFactory boolean getOptimistic () Get the default Optimistic setting for all PersistenceManager instances obtained from this factory. Return: the default Optimistic setting. Since: JDO 1.0

JDO Method in javax.jdo.PersistenceManagerFactory void setOptimistic (   boolean flag ) Set the default Optimistic setting for all PersistenceManager instances obtained from this factory. Parameters: flag - the default Optimistic setting. Since: JDO 1.0

JDO Method in javax.jdo.Transaction boolean getOptimistic () Optimistic transactions do not hold data store locks until commit time. Return: the value of the Optimistic property. Since: JDO 1.0

.JDOOptimisticVerificationException This class represents optimistic verification failures. The nested exception array contains an exception for each instance that failed the optimistic verification. Since: JDO 1

.NontransactionalRead javax.jdo.option.NontransactionalWrite javax.jdo.option.RetainValues javax.jdo.option. Optimistic

JDO Method in javax.jdo.PersistenceManagerFactory String getConnectionFactory2Name () Get the name for the second data store connection factory. This is needed for managed environments to get nontransactional connections for optimistic transactions. Return: the name of the data store connection factory. Since: JDO 1.0

JDO Method in javax.jdo.PersistenceManagerFactory void setConnectionFactory2Name (   String connectionFactoryName ) Set the name for the second data store connection factory. This is needed for managed environments to get nontransactional connections for optimistic transactions

JDO Method in javax.jdo.PersistenceManagerFactory Object getConnectionFactory2 () Get the second data store connection factory. This is needed for managed environments to get nontransactional connections for optimistic transactions. Return: the data store connection factory. Since: JDO 1.0

JDO Method in javax.jdo.PersistenceManagerFactory void setConnectionFactory2 (   Object connectionFactory ) Set the second data store connection factory. This is needed for managed environments to get nontransactional connections for optimistic transactions. JDO implementations

JDO Method in javax.jdo.PersistenceManager JDOConnection getDataStoreConnection () If this method is called while a datastore transaction is active, the object returned will be enlisted in the current transaction. If called in an optimistic transaction or outside an active transaction, the object

to do so. If an optimistic transaction is active, this method obtains a datastore connection

. If an optimistic transaction is active, this method obtains a datastore connection, synchronizes the cache

optimistic transactions. Transient nontransactional instances return false . Parameters: pc - the calling

.PersistenceManagerFactoryClass" "javax.jdo.option. Optimistic ", "javax.jdo.option.RetainValues", "javax.jdo.option

JDO Method in javax.jdo.Transaction void begin () Begin a transaction. The type of transaction is determined by the setting of the Optimistic flag. Throws: JDOUserException - if transactions are managed by a container in the managed environment, or if the transaction is already active. See Also: setOptimistic getOptimistic Since: JDO 1.0

to optimize the query execution by ignoring changed values in the cache. For optimistic transactions

the cache. For optimistic transactions, this can dramatically improve query response times

are standard key names: "javax.jdo.PersistenceManagerFactoryClass" "javax.jdo.option. Optimistic

optimistic transactions, this method allows the application to make the state of the instance