About detached

manual

Detached Entity Objects

Explains detached entity objects and how to work with detached objects in JPA, including merging them into an EntityManager. Detached entity objects are objects in a special state in which they are ... in the database. Compared to managed entity objects, detached objects are limited in functionality: Many JPA methods do not accept detached objects (e.g. lock lock(entity, lockMode) ...

 
forum_thread

NPE after an @embedded obj is updated for a detached entity

I have an entity that looks like this: class User { @embedded private Profile profile; ...}   After running something like this: User user = entityManager.createQuery("select......entityManager.detach(user);user.getProfile().setDescription("Something...   I get the following error: #1 2011-01-05 08:13 I have an entity that looks like this: class User { @ embedded private Profile ...

 
manual

Working with JPA Entity Objects

Explains the entity object lifecycle and the persistence context.... objects consists of four states: New, Managed, Removed and Detached. When an entity object is initially created its ... Deleting Entities section. The last state, Detached , represents entity objects that have been disconnected from the ...

 
issue

Navigation through lazy loading from Detached Objects

A main limitation of detached objects (as explained on the Detached Entities manual page) is: ... A main limitation of detached objects (as explained on the Detached Entities manual page) is: Retrieval by navigation ...

 
forum_thread

GWT RPC is throwing serialization exception when I have object db date value

Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 'objectdb.java.util.Date' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = Sat Jan 29 00:00:00 PST 2011    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:614)  ... classes again to use this). So you can use now detached entity objects . Maybe you may even use detached entity objects directly in GWT with no DTO.   ...

 
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 ...

 
api-jpa

detach(entity)

Remove the given entity from the persistence context, causing a managed entity to become detached.(Method of javax.persistence.EntityManager)

 
api-jpa

CascadeType.DETACH

Cascade detach operation(Enum Constant of javax.persistence.CascadeType)

 
forum_thread

Object DB vs EclipseLink/TopLink: Unloaded relationships in detached entities

This topic is for those considering migrating from EclipseLink JPA or TopLink to ObjectDB JPA. ... (and so lazy loading would initially work), they become detached once the EntityManager under control of the container, and then in ... of lazy loaded relationships outside a transaction, once detached, any you won't have needed any of the above required under ...

 
forum_thread

Merge on detached entities

Hello, it is possible to merge detached entities? There are some attached entities which load from the database. The transaction is finished and the entities become detached. In a new transaction the fields of the detached entities will be changed and a merge by em.merge(entity) will be saved the entities. Can this works correctly? How are the rules of the merge process? Do the changed fields of the detached entity overwrite the fields in the database? Also changed fields which are set to null? ... Hello, it is possible to merge detached entities? There are some attached entities which load from the ... The transaction is finished and the entities become detached. In a new transaction the fields of the detached entities will ...