ObjectDB Database Search

Jakarta Persistence (JPA) Interface jakarta.persistence. EntityManager Super Interfaces: AutoCloseable Interface used to interact with the persistence context. An instance of EntityManager ... to the associated persistence unit. An application-managed EntityManager may be created

Hi, in the following code you can see an example with EntityManager .refresh(). The example ... -------------------- package example; import java.io.File; import javax.persistence. EntityManager ; import ... ;  public void refreshTest() {         EntityManager

EntityManager with the same unitName. TradesC method needs an User, which is taken from UserDataB ... .pingushare.entity.p1.User#2' belongs to another EntityManager at com.objectdb.o.MSG.d(MSG.java:61 ... this should be a problem if, in the same transaction, an entity is passed into more EntityManagers , but here are 2

wherein the EntityManagerFactory objects are being locked during EntityManager object creation.  Please refer ... with ObjectDB wherein the EntityManagerFactory objects are being locked during EntityManager object creation.  This is the normal behavior of ObjectDB. Creation operations of  EntityManager

' belongs to another EntityManager (error 613) 10:29:14,887 ERROR [stderr] (http--10.23.3.98-8081-5 ... to another EntityManager 10:29:15,072 ERROR [stderr] (http--10.23.3.98-8081-5) at com.objectdb.o ... 'pbdmodel.impl.OrgJedinicaImpl#8' belongs to another EntityManager 10:29:15,089 ERROR [stderr] (http--10.23

I am trying to track down some obscure errors with multi-threading.  This involved looking at the EntityManager Metamodel but this caused an ObjectDB exception.  So I reverted ... ;password=admin;drop" EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); MyEntity

In our production environment, entity manager creation, the line below, sometimes take upto few ten's of seconds to create. Is there any reason that is known which may be causing this ? Any suggestions on how this can be addressed ?   EntityManager entityManager = factory.createEntityManager

.persistence.PersistenceException: No Persistence provider for EntityManager named objectdb

Just started using objectdb (2.3.4). Calling EntityManager .merge for a new (non-managed) object gives EntityNotFoundException. I am perplexed by this. See attached test case. Thanks for your assistance. Full error output is: Exception in thread "main" [ObjectDB 2.3.4] javax.persistence

.Symbol#7' belongs to another EntityManager [Symbol:7] When I change the order in which the test runs (by

on which they were invoked. Flush mode (setFlushMode) Changes made to a database by using an EntityManager ... . However, these changes are not visible to users of other EntityManager instances. JPA implementations ... . The application can change the default mode at the EntityManager level, which applies to all queries in

Detached entities are objects in a special state where they are not managed by an EntityManager ... to the database unless you merge them back into an EntityManager , which makes them managed again. Detached objects are useful when an EntityManager is not available or for transferring objects between different

of EntityManager . A persistence unit defines the set of all classes that are related or grouped by ... -managed EntityManager may be created via a call to createEntityManager . However, this approach places ... EntityManager s. Alternatively, in the Jakarta EE environment, a container-managed EntityManager

when the EntityManager detects that an entity has been modified. @PostUpdate : Invoked after an entity ... with the database operation that triggers the event, callback methods must not call EntityManager or Query methods

The ability to retrieve managed entities is a key advantage of JPQL. For example, the following query returns Country objects, which then become managed by the EntityManager instance em : TypedQuery ... are not associated with an EntityManager , and changes to them during an active transaction are not

, and its initial state is New. An explicit call to persist associates the object with an owner EntityManager , em ... the EntityManager , or by commit . Referenced embedded objects The following code stores an Employee instance

. Retrieve it by result type from EntityManagerFactory.getNamedQueries , and use it to get a TypedQuery instance via EntityManager .createQuery .

by the persistence provider when an entity reference obtained by EntityManager .getReference is accessed but the entity does not exist. Thrown when EntityManager .refresh is called and the object no longer exists in the database. Thrown when EntityManager .lock is used with pessimistic locking is used

We have a big entity object tree in our project. If I use the entityManager .remove(childEntity) method to remove a child entity a entityManager .refresh(parentEntity) is necessary in order to have an updated parent/child object tree in memory. But entityManager .refresh is too slow for our project

. See Also: AttributeNode Subgraph NamedEntityGraph EntityManager .createEntityGraph(Class) EntityManager .createEntityGraph(String) EntityManager .getEntityGraph(String) EntityManagerFactory.addNamedEntityGraph(String, EntityGraph) EntityManager .find(EntityGraph, Object, FindOption...) Since: Jakarta

.persistence.Entity; import javax.persistence. EntityManager ; import javax.persistence.EntityManagerFactory ... void setId(long id) {    this.id = id;   } } private EntityManager ... ; EntityManager entityManager = emf.createEntityManager();   entityManager .setFlushMode(FlushModeType.AUTO

. A reference to a named entity graph may be obtained by calling EntityManager .getEntityGraph , and may be passed to EntityManager .find . Since: Jakarta Persistence (JPA) 2.1 Annotation Elements String name (Optional) The name used to identify the entity graph in calls to EntityManager .getEntityGraph

Jakarta Persistence (JPA) Interface jakarta.persistence.FindOption An option influencing the behavior of EntityManager .find . Built-in options control locking , cache interaction , and timeouts ... Timeout EntityManager .find(Class, Object, FindOption...) EntityManager .find(EntityGraph, Object, FindOption...) Since: Jakarta Persistence (JPA) 3.2

_ EntityManager = m_EntityMgrFactory.createEntityManager(); m_ EntityManager .setFlushMode( FlushModeType.COMMIT ); if ( m_ EntityManager .isOpen() ) { m_ EntityManager .getTransaction().begin(); for ( Pa3DataKey dataKey : aDataKeys ) { m_ EntityManager .persist( dataKey ); } m_ EntityManager .getTransaction().commit

Enumerates flush modes recognized by the EntityManager . When queries are executed ... transaction, the persistence provider must not flush to the database. See Also: EntityManager

Jakarta Persistence (JPA) Interface jakarta.persistence.LockOption An option influencing the behavior of EntityManager .lock . Built-in options control scope , and timeouts . This interface ... . See Also: LockModeType PessimisticLockScope Timeout EntityManager .lock(Object, LockModeType, LockOption...) Since: Jakarta Persistence (JPA) 3.2

the persistence provider when EntityManager .persist is called and the entity already exists ... . See Also: EntityManager .persist(Object) Since: Jakarta Persistence (JPA) 1.0 Public Constructors

with the EntityManager's life cycle but cannot figure out what. I am using Guice injection and Guice persist and should get one EntityManager per request. Also, please note that in the web app I actually ... ;  } } public void test() {     // em is the EntityManager     em

(all of them)? Does it happen when the EntityManager is open or closed? Note that if you are working with detached objects (e.g. after closing the EntityManager ) then anything that has not ... yet resolved before the elements are returned and the EntityManager is closed? Kevin Kevin Pfaff So you say

(db_name) 3. After runnings some automatic tests for ca. 1 h all EntityManagers are closed ... the Database but more the 236 Copies of those entitities in the memory (after closing all EntityManagers ... an EntityManager  in the connection pool of a live E ntityManagerFactory , where that EntityManager

entityManagerFactory;         private EntityManager entityManager ... ;  entityManager = entityManagerFactory.createEntityManager();        ... ;    entityManager .getTransaction().begin();        

Jakarta Persistence. An EntityManager may be a JTA entity manager, where transaction management

as an argument to: one of the methods of EntityManager which obtains locks ( lock() , find() , or

EntityManager .runWithConnection(ConnectionConsumer) Since: Jakarta Persistence (JPA) 3.2 Public Instance

EntityManager .callWithConnection(ConnectionFunction) Since: Jakarta Persistence (JPA) 3.2 Public

Jakarta Persistence (JPA) Interface jakarta.persistence.EntityTransaction Interface used to control transactions on resource-local entity managers. The EntityManager .getTransaction method returns the EntityTransaction interface. Since: Jakarta Persistence (JPA) 1.0 The Database Connection using

)getServletContext().getAttribute("emf"); EntityManager em = emf.createEntityManager(); try { // Handle ... is retrieved from the application scope attribute, and then an EntityManager (representing a database

Hello, I have a problem with the EntityManager .merge() function. I set a property value ... ErgoDaoJpa implements IErgoDao { @PersistenceContext private EntityManager entityManager ; public void ... ; throws EntryAlreadyExistException, DaoException { entityManager .persist(ergoClass); } public void

; static EntityManager departmentDB = emf.createEntityManager(); public  static EntityManager employeeDB = emf.createEntityManager(); public  static EntityManager paygradeDB = emf.createEntityManager(); public  static EntityManager programDB = emf.createEntityManager(); public  static

EntityManager ) by two concurrent threads. ObjectDB synchronizes use of EntityManager by different threads ... implementation. Maybe a socket from a closed EntityManager is still used after the EntityManager is closed after its resources are allocated and used by a new EntityManager . You may try the following

.persistence. EntityManager ; import javax.persistence.EntityManagerFactory; import javax.persistence ... entityManagerFactory; private EntityManager entityManager ; protected Map sharedState = new HashMap (); private ... = Persistence.createEntityManagerFactory((String) options.get("url")); entityManager

class Singleton implements Serializable { public static Singleton getInstance( EntityManager em ... int version; @Basic protected java.lang.Integer lastInstance; public void generateItems( EntityManager ... (this, startCnt); em.persist(item); lastInstance = startCnt; } } public Item findItem( EntityManager em, int

? When should I use the close method of EntityManagerFactory and  EntityManager ? As long as ... the close method of EntityManagerFactory and  EntityManager ? You can close the  EntityManagerFactory when the web application is closed (see this example ). Usually  EntityManager

to the current transaction by means of the EntityManager .joinTransaction method. Default

and transactions), to inject a JPA  EntityManager , to manage transactions and to look for JSP pages in

, controllers and transactions), to inject a JPA EntityManager , to manage transactions and to look

. EntityManager ; import javax.persistence.EntityManagerFactory; import javax.persistence.FetchType; import ... ; EntityManager entityManager = emf.createEntityManager();   ParentEntity parentEntity = new ParentEntity();   entityManager .getTransaction().begin();   entityManager .persist(parentEntity

.persistence. EntityManager ; import javax.persistence.EntityManagerFactory; import javax.persistence ... () { emf = Persistence.createEntityManagerFactory("ReproducePU"); }   public EntityManager ... findMomentEntity(Long id) { EntityManager em = getEntityManager(); try { return em.find(MomentEntity.class, id

; } } /** Workflow **/ Account account = new Account(); entityManager .persist(account); entityManager .flush(); Project project = new Project(); project.setAccount(account); entityManager .persist(project); entityManager .flush(); account = entityManager .find(account); assertNonNull(account.getProjects

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 ... cautiously because bypassing the EntityManager may break its synchronization with the database. For example