About EntityManager

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Forum
1

Type xxx is not found (error 301)

JPA application by obtaining PersistenceManager from your EntityManager:     em.unwrap ... ), so, what would the object be? oddly, I don't have an unwrap() method on my EntityManager?? also, I don't have a query (String, Class) method on my EntityManager > 3) use jdo from jpa - is there a performance penalty
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1

Unexpected behaviour upon update. Bug?

=             Persistence.createEntityManagerFactory("ODB.odb"); EntityManager em = emf.createEntityManager ... the EntityManager as a managed entity object and it is returned with the update from the query. Changes in one EntityManager instance are invisible in other EntityManager instances until commit, but visible
Issue
1

Feature suggestion: auto-detection of entities via persistence.xml extension

I am encountering problems (complexities) with EntityManager registration of entities ... system: hibernate.archive.autodetection https://docs.jboss.org/hibernate/entitymanager/3.6/reference/en ... to the EntityManager whether one performs compile-time enhancement or runtime enhancement ? That is, does
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1

Update more than 10000 entities by an update query fails

"); EntityManager emOne = emf.createEntityManager(); emOne.getTransaction().begin ... ); } emOne.getTransaction().commit(); emOne.close(); EntityManager ... (); emTwo.close(); EntityManager emThree = emf.createEntityManager(); emThree
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1

Database is erased after deploying a new web application version

from Tomcat's manager? When should I use the close method of EntityManagerFactory and EntityManager ... of EntityManagerFactory and EntityManager? You can close the EntityManagerFactory when the web application is closed (see this example). Usually EntityManager instances are created and closed
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1

"Attempt to lock a non entity object" error

once per EntityManager. I've downloaded the new build and tried the code above that uses a JDO Transaction ... .Entity; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory ... \\workspace\\TestProject\\Storage.odb");         EntityManager em = emf.createEntityManager
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Criteria query error: Unexpected query token

= entityManager.getCriteriaBuilder(); CriteriaQuery c = qb.createQuery(aClass); c.from(aClass); return entityManager.createQuery(c).getResultList(); }   Entities ... ) {      CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();      CriteriaQuery q
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1

Does ObjectDB support lazy loading?

. However, when the Parent object is read from EntityManager, all the properties except ID of the Child objects are null. The EntityManager is not yet closed when the getters are called. After I change the annotation ... = Persistence.createEntityManagerFactory(path); EntityManager em = emf.createEntityManager
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1

Entity factory

, you can obtain the EntityManager in a JPA listener method by using JDO:     EntityManager em = // find the EntityManager that manages this             (EntityManager)JDOHelper
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1

Entity has be persistended,but query not fetched?

.odb");         EntityManager em = emf.createEntityManager();         em.getTransaction().begin ... {} } Maybe you are using a different EntityManager for the query? Updates can only be visible before commit in the EntityManager that was used to apply the updates. Thanks! I are using a different EntityManager for the query. maozf