About pessimistic

manual

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 update collisions ... the first choice for most applications, since compared to pessimistic locking it is easier to use and more efficient. In the rare ...

 
manual

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 ...

 
issue

InternalException during producer/consumer scenario

Hi, I'm trying to use objectdb in a producer/consumer scenario. Producer threads put message objects into a table while consumer threads remove the objects based on age, priority, etc. There are 2 main motivations for using objectdb for this purpose rather than a queue or similar data structure: 1) The consumer can select the "next" object based on a range of potentially complex criteria. 2) The number of objects produced can be potentially exceed available memory so can be held on disk within the objectdb file. ... on a query with MaxResults set to 1 and LockMode set to PESSIMISTIC_WRITE. This results in the exceptions below. Could you ...

 
forum_thread

Pessimistic Lock Timeouts setting

Hi,   I realise that JPA2 doesn't necessarily define a standard API way for Lock Timeouts. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" ... my test case is failing here. The issue is that once the pessimistic lock is in place on the record, a subsequent access (which is a ... Support of pessimistic lock timeout setting ( javax.persistence.lock.timeout ) was ...

 
issue

Pessimistic lock timeout - blocks indefinitely

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: ... which each try to update the object. I'm using a pessimistic lock with timeout as follows: Map<String,Object> ... ( MyEntity. class , 1 , LockModeType . PESSIMISTIC_WRITE , properties ) ; One thread manages to do ...

 
forum_thread

Pessimistic lock

Dear Sir or Madam, In the past we used the default Options in the JDO 1.0. See below for reference: javax.jdo.option.Optimistic=false javax.jdo.option.NontransactionalRead=true javax.jdo.option.NontransactionalWrite=false javax.jdo.option.RetainValues=true javax.jdo.option.RestoreValues=false Now we use the following options in DB2: #1 2016-08-25 05:40 Dear Sir or Madam, In the past we used the default Options in the JDO 1.0. See below for reference: ...

 
api-jpa

LockModeType.PESSIMISTIC_WRITE

Pessimistic write lock.(Enum Constant of javax.persistence.LockModeType)

 
api-jpa

javax.persistence.EntityManager

Interface used to interact with the persistence context.(Interface of JPA)

 
release

2.2.5

... queries ( issue #11 ). Added support of pessimistic lock timeout ( javax.persistence.lock.timeout ). ... Page... method. Added exception on pessimistic locking retrieval with no active transaction. ...

 
release

2.2.4

... queries ( issue #11 ). Added support of pessimistic lock timeout ( javax.persistence.lock.timeout ). ... Page... method. Added exception on pessimistic locking retrieval with no active transaction. ...