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Detached entity objects are objects in a special state in which they are not managed by any EntityManager but still represent objects 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

: New, Managed, Removed and Detached . When an entity object is initially created its state is New ... deletion are provided in the Deleting Entities section. The last state, Detached , represents entity ... of an EntityManager become detached when the EntityManager is closed. Working with detached objects

(and so lazy loading would initially work), they become detached once the EntityManager under control ... are involved) to ensure the desired collections are resolved already before detachment , losing ... bean is released. 3. Use a FETCH JOIN as described here: Detach JPA objects with lazy initialized

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

Hi, I have a question about detaching objects after issuing query with JOIN FETCH. Let's say I ... classes became detached but without A classes and because EM is closed, B.aClasses is always null. I thought, that after join fetch and CascadeType. DETACH list of A classes should be accessible from B

: objectdb.temp.no- detach NOT USED This problems only seems to occur in my large web application ... out what is happening and why. I am using pre- detach loading after em.find(id), because just relying on JPA-annotations ... these during the pre- detach loading should (and usually does) load everything needed to compute

that become detached (e.g. when the EntityManager is closed). Transparent activation is not supported for detached objects. Therefore, only content that has already been fetched from the database is available in objects that are detached . JPA 2 introduces methods for checking if a specified entity object

JPA Method in javax.persistence.EntityManager void detach (   Object entity ) Remove the given entity from the persistence context, causing a managed entity to become detached ... to the database. Entities which previously referenced the detached entity will continue to reference

out that all fields of retrieved objects are on their default value till i first call a getter or detach ... the transaction and the em. With 2.3.5_04 I get an empty detached user object back. Only the id is correct. Shouldn't the detach and field population happen implicitly during em.close()? mosi0815 Ralph Moser

Hello, the exception "Attempt to remove a detached entity object" have no information about the detached entity. It is very hard, especially if the involved entities uses cascading, to find the removed call for the detached entity.   It would be very helpful if you can add a few information

JPA Enum Constant in javax.persistence.CascadeType DETACH Cascade detach operation Since: JPA 2.0

Hello, that's a strange error for me ... I have a detached object in my Java code and i just wanted to merge it ... Unfortunatly, i get this error : Failed to commit transaction: Attempt to remove a detached entity object (error 613)      at com.objectdb.jpa.EMImpl.commit

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

cannot be preserved for detached entity objects (explained in chapter 3 ) unless either the entity class

is not an instance of an entity class or if it is a detached entity. A TransactionRequiredException

A main limitation of detached objects (as explained on the Detached Entities manual page) is: Retrieval by navigation from detached objects is not supported, so only persistent fields that have been loaded before detachment should be used. As explained on the Object DB vs EclipseLink/TopLink

Hello, we've encountered an issue with ObjectDB. The attached code is a minimal example of the relevant work flow and fails at the assert in line 58: assertTrue(secondQueryResult.get(1).strValue != null); The entity is detached and data is not loaded lazily from the database. We've also found

the persistence context, causing all managed entities to become detached . Changes made to entities ... void detach (Object entity) Remove the given entity from the persistence context, causing a managed entity to become detached . Unflushed changes made to the entity if any (including removal

JDO Interface Detachable This interface is implemented by classes that can be detached from ... so they are preserved while outside the persistence environment. The detached state is stored as a field in each instance of Detachable . The field is serialized so as to maintain the state of the instance

JDO Method in javax.jdo.spi. Detachable void jdoReplaceDetachedState () This method calls the StateManager with the current detached state instance as a parameter and replaces the current detached state instance with the value provided by the StateManager. Since: JDO 2.0

JDO Method in javax.jdo.listener.DetachCallback void jdoPostDetach (   Object  detached ) This method is called during the execution of javax.jdo.PersistenceManager.detachCopy on the detached instance after the copy is made. Parameters: detached - The corresponding (attached) persistent instance. Since: JDO 2.0

JDO Annotation Attribute in javax.jdo.annotations.PersistenceCapable String detachable default "" Whether this class or interface is detachable . Since: JDO 2.1

JDO Static Field in javax.jdo.FetchPlan DETACH _LOAD_FIELDS For use with PersistenceManager.detachCopy and setDetachmentOptions . Specifies that fields that are not loaded but are in the current fetch plan should be loaded prior to detachment . Since: JDO 2.0

JDO Static Field in javax.jdo.FetchPlan DETACH _UNLOAD_FIELDS For use with PersistenceManager.detachCopy and setDetachmentOptions . Specifies that fields that are loaded but not in the current fetch plan should be unloaded prior to detachment . Since: JDO 2.0

JDO Static Field in javax.jdo.listener.InstanceLifecycleEvent DETACH Since: JDO 2.0

JDO Enum Constant in javax.jdo.ObjectState DETACHED _CLEAN Since: JDO 1.0

JDO Enum Constant in javax.jdo.ObjectState DETACHED _DIRTY Since: JDO 1.0

cascade=ALL is equivalent to cascade={PERSIST, MERGE, REMOVE, REFRESH, DETACH } . Since: JPA 1.0 Enum Constants ALL Cascade all operations Since: JPA 1.0 DETACH Cascade detach operation Since: JPA 2.0

of persistent instances See Also: deletePersistent (Object pc) Since: JDO 1.0 T detachCopy (T pc) Detach the specified instance from the PersistenceManager . The flags for detachment ( DETACH _LOAD_FIELDS and DETACH _UNLOAD_FIELDS) and the active fetch groups determine the scope of fetching for the graph

persistent and applies detached instance changes to the cache. It must be called in the context ... . During makePersistent of transient instances, the create life cycle listener is called. For detached instances, it locates or instantiates a persistent instance with the same JDO identity as the detached instance

JDO Method in javax.jdo.PersistenceManager T[] detachCopyAll (   T... pcs ) Detach the specified instances from the PersistenceManager . The flags for detachment ( DETACH _LOAD_FIELDS and DETACH _UNLOAD_FIELDS) and the active fetch groups determine the scope of fetching for the graph

() Get options used during detachment . Since: JDO 2.0 Class[] getDetachmentRootClasses () Get the root classes for DetachAllOnCommit. Return: The detachment root classes Since: JDO 2.0 Collection getDetachmentRoots () Get the roots for DetachAllOnCommit. Return: Collection of detachment roots. Since: JDO 2.0

is implemented by listeners to be notified of detach events. Since: JDO 2.0 Public Methods void ... .PersistenceManager.detachCopy after the detached copy is made. It is called after the method DetachCallback.jdoPreDetach is called on the detached instance. Parameters: event - the detach event

;pcs ) Detach the specified instances from the PersistenceManager . The flags for detachment ( DETACH _LOAD_FIELDS and DETACH _UNLOAD_FIELDS) and the active fetch groups determine the scope of fetching ... instances is as specified by the FetchPlan. Parameters: pcs - the instances to detach Return

JDO Method in javax.jdo.PersistenceManager T detachCopy (   T pc ) Detach the specified instance from the PersistenceManager . The flags for detachment ( DETACH _LOAD_FIELDS and DETACH ... the FetchPlan. Parameters: pc - the instance to detach Return: the detached instance See Also: detachCopyAll (Object[]) Since: JDO 2.0

set to true, during beforeCompletion all cached instances are prepared for detachment according ... the user's afterCompletion callback, all detachable persistent instances in the cache transition to detached ; non- detachable persistent instances transition to transient; and detachable instances

() Since: JDO 2.0 Boolean isDetached (Object pc) Tests whether the parameter instance is detached . Instances that are detached return Boolean.TRUE . Instances known by the implementation to be non- detached return Boolean.FALSE . Instances not recognized by the implementation return null . Parameters

JDO Method in javax.jdo.spi.StateManager Object[] replacingDetachedState (    Detachable  pc,    Object[] state ) The replacement value of the detached state in the calling instance. Parameters: pc - the calling Detachable instance state - the current value

postAttach ( InstanceLifecycleEvent  event) This method is called after a detached instance ... is the corresponding persistent instance in the cache; the target instance is the detached instance. This method ... ) This method is called before a detached instance is attached, via the javax.jdo.PersistenceManager

getDetachedInstance () Returns the detached instance involved in the event. Return: The detached instance involved in ... - callback except preAttach, or the detached instance for a postDetach or preAttach callback ... . Return: The detached instance for preDetach and postAttach, the persistent instance

Return: the new value for the field Since: JDO 1.0 Object[] replacingDetachedState ( Detachable  pc, Object[] state) The replacement value of the detached state in the calling instance. Parameters: pc - the calling Detachable instance state - the current value of the detached state

, transactional, dirty, new, deleted, or detached ; and to get its associated PersistenceManager ... ) Since: JDO 1.0 boolean jdoIsDetached () Tests whether this object has been detached . Instances that have been detached return true. Transient instances return false. Return: true if this instance

this factory. CopyOnAttach set to true specifies that during makePersistent, copies are made of detached parameter instances. With this flag set to false , detached parameter instances are attached directly and change their state from detached -clean to persistent-clean or from detached -dirty

that during makePersistent, copies are made of detached parameter instances. With this flag set to false , detached parameter instances are attached directly and change their state from detached -clean to persistent-clean or from detached -dirty to persistent-dirty. See Also: getCopyOnAttach () Since: JDO 2.1 void

are made of detached parameter instances. With this flag set to false , detached parameter instances are attached directly and change their state from detached -clean to persistent-clean or from detached -dirty to persistent-dirty. See Also: getCopyOnAttach () Since: JDO 2.1

whether the instance is persistent, transactional, dirty, new, deleted, or detached ... has been detached . Instances that have been detached return true. Transient instances return false. Parameters: pc - the instance Return: true if this instance is detached . See Also: PersistenceCapable

JDO Interface DetachCallback This interface is used to notify instances of detach events. Since: JDO 2.0 Public Methods void jdoPostDetach (Object  detached ) This method is called during the execution of javax.jdo.PersistenceManager.detachCopy on the detached instance after the copy

) Tests whether the parameter instance is detached . Instances that are detached return Boolean.TRUE . Instances known by the implementation to be non- detached return Boolean.FALSE . Instances not ... if the parameter instance is detached . See Also: PersistenceManager.detachCopy (Object pc) PersistenceCapable() Since: JDO 2.0

JDO Static Method in javax.jdo.JDOHelper boolean isDetached (   Object pc ) Tests whether the parameter instance has been detached . Instances that have been detached return true. Transient instances return false. Parameters: pc - the instance Return: true if this instance is detached . See Also: PersistenceCapable() Since: JDO 2.0

instances is as specified by the FetchPlan. Unlike detachCopy, the instances are not detached ; there is no detachment information in the instances. The instances to be made transient do not need to implement the javax.jdo.spi. Detachable interface. Parameters: pcs - the root instances to make transient