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Merge with Parent/Child entities not possible

javax.persistence.Entity; import javax.persistence.EntityManager; import javax.persistence ... id) {    this.id = id;   } } private EntityManager createEntityManager(String dbFileName ... ("objectdb:" + dbFileName);   EntityManager entityManager = emf.createEntityManager

Updating Entities

"); public static EntityManager employeeDB = emf.createEntityManager(); public static EntityManager ... EntityManagers were not communicating their changes to each other. Which is where my question comes in ... . That said - those updates take place within their respective EntityManager i.e. EmployeeOverview deals

Internal exception when updating date filed (TemporalType.DATE)

entityManagerFactory;         private EntityManager entityManager;         public DataManager(String ... (connectionString);             entityManager = entityManagerFactory.createEntityManager ... ) {             System.out.println("Set new birthday:" + newBirthday.toString());             try {                 entityManager

Performance in large transactions

.) Pseudocode for the fast and the slow solution FAST: for (i = 0; i <100; i ++) { EntityManager entityManager = getEntityManagerFactory().createEntityManager(); entityManager.setFlushMode(FlushModeType.AUTO); EntityTransaction transaction = entityManager.getTransaction

@OneToMany(fetch = FetchType.LAZY) list is always null

") private EntityManager entityManager; @EJB private Manager manager; private ... = entityManager.createQuery("SELECT p FROM Parent p"); parents = query.getResultList ... (unitName = "my-pu") private EntityManager entityManager; public void persist(Object o

Memory Leaks after COMMIT operation (checked on versions 2.6.5 & 2.6.6.b01)

_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


EntityManager em; ... customers = em.createNamedQuery("findAllCustomersWithName ... with the EntityManager methods that create query objects. (Required) The name used to refer to the query with the EntityManager methods that create query objects. Since: JPA 1.0 String query (Required) The query


Method javax.persistence.EntityManagerFactory EntityManager createEntityManager() Create a new application-managed EntityManager. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance. Returns: entity manager instance


Method javax.persistence.EntityManagerFactory EntityManager createEntityManager( Map map ) Create a new application-managed EntityManager with the specified Map of properties. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true


: Serializable Thrown by the persistence provider when EntityManager.persist(Object) is called ... See Also: javax.persistence.EntityManager.persist(Object) EntityExistsException() Constructs a new

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Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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