About clear

manual

Working with JPA Entity Objects

Explains the entity object lifecycle and the persistence context.... The persistence context can be cleared by using the clear clear() EntityManager's method Clear the persistence context, ...

 
api-jpa

clear()

Clear the persistence context, causing all managed entities to become detached.(Method of javax.persistence.EntityManager)

 
forum_thread

Working with a cleared cache

I'm working on trying to improve the performance of our database processing class and I'm attempting to keep the L1 cache within the PersistenceManager cleared in an effort to reduce its memory footprint. The code snippet below is part of a Callable task that is run repeatedly with a given list of commands. When I run the code as written I start getting the stack traces that are listed.  However, if I comment out the calls to makeTransactionalAll() and evictAll() everything works. #1 2011-08-18 15:42 I'm working on trying to improve the performance of our database processing class and I'm attempting to k ...

 
forum_thread

A lot of ENT and SIV instances which are not cleared by GC

Hello. I have a JSF application (Glassfish 4, Java 8, ObjectDB 2.6.0). In some time the heap is getting 95% full with java.lang.OutOfMemoryError: GC overhead limit exceeded.  The first screenshot from VisualVM shows used heap during a 1000 requests stress test. The second shows that after this test there are many com.objectdb.o.ENT and com.objectdb.o.SIV instances. Why isn't it cleaned? I use simple EJB managers containing EntityManagers. On bean's PreDestroy and in servlet's i make entityManager.clear(); ... PreDestroy and in servlet's i make entityManager.clear(); Screenshot_from_2015-02-21_203234.png ... associated with an helper ENT object.  entityManager.clear() should release strong references to ENT objects. Are you ...

 
manual

Storing JPA Entity Objects

Explains how to use JPA to store (persist) entity objects in the database.... requires special consideration. The combination of the clear and flush methods can be used to save memory in large ... Page... ( ) ; em. clear clear() EntityManager's method Clear the persistence context, ...

 
api-jdo

InstanceLifecycleEvent.CLEAR

(Static Field of javax.jdo.listener.InstanceLifecycleEvent)

 
issue

JQL-Update Queries fails with activated L2-Cache

When using JQL-Update Queries it is basically not working without calling entityManager.clear() after a transaction commit. When the clear() method isn't called the entityManager will never return a container the updated Entities. Scenario 1: Disabled L2 Cache, updating elements using UPDATE-Query and fetching Entities afterwards from database. Expected result: Getting changed Entities from database - Actual result: No changes are visble. ... is basically not working without calling entityManager.clear() after a transaction commit. When the clear() method isn't called the entityManager will never return a ... elements using UPDATE-Query, calling entityManger.clear() and fetching Entities afterwards from database. Expected ...

 
api-jpa

evictAll()

Clear the cache.(Method of javax.persistence.Cache)

 
api-jdo

javax.jdo.listener.ClearLifecycleListener

This interface is implemented by listeners to be notified of clear events.(Interface of JDO)

 
manual

Detached Entity Objects

Explains detached entity objects and how to work with detached objects in JPA, including merging them into an EntityManager.... Bulk Detach The following operations clear the entire EntityManager javax.persistence.EntityManager ... EntityManager . Invocation of the clear clear() EntityManager's method Clear the persistence ...