About EntityManager

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NoSuchFieldError: __odbTracker on NetBeans 7.3 + JBoss 7.1.1

); entityManager.persist(city); entityManager.persist(person); The exception: java.lang ... Person(); person.setName(name); entityManager.persist(person ... .setCity(city); entityManager.persist(city); entityManager.persist
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NullPointerException while setting a new property value

(Collection entityCollection) { final EntityManager em ... should have its own EntityManager and entities. According to the JPA specification: "An entity manager ... manner." Actually there is an attempt to provide thread safe EntityManager and persistence context
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spuriously objectdb objects have null references

entityManager per thread and have a central point where we encapsulated all the needed entitymanager ... Object(); public static void begin(EntityManager threadEntityManager){ synchronized(lockBegin ... >(); ...       When an entity object is detached (e.g. when the EntityManager is closed), ObjectDB
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stress test -> com.objectdb.o.InternalException: null

that closed the EntityManager and moved its connection to the pool. Then to ObjectDB (on the just closed EntityManager) that had to commit changes using the connection (which has already been moved ... ");                 EntityManager em1 = emf.createEntityManager();         em1.getTransaction().begin();         em1.persist
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Transaction isolation support?

when the fetch start? Martin   Every EntityManager manages its own memory objects (which represent database objects). Therefore, if an entity object is retrieved by one EntityManager and then updated in the database by another EntityManager, the first EntityManager may still have an old version of that entity
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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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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
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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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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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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