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Database size is much larger than expected (x2)

();         for (int i = 0; i < 1000; i++) {             em.getTransaction().begin();             em.persist ... ;wejhfoiasuydfajdfljweoifasldjfiejlsjdfaiowufajsdfieuajdfjiaejf;ajdfie;lajdkfjiesljdafjeia;jfe";   trans.begin();   for (; i<iNumber; i++){    Uris uri = new ... ("Url = %s%n%n", uri.getsUrl());     em.clear();     trans.begin();    }   }   trans.commit

"Attempt to lock a non entity object" error

();         Person p = new Person("Ron");         em.getTransaction().begin();         em.persist(p);         em ... ().setRetainValues(true);         em.getTransaction().begin();         p = em.find(Person.class, 1 ... : " + p.name);         em.getTransaction().rollback();         em.getTransaction().begin

Question about modification

valor = menu.nextInt(); em.getTransaction().begin(); Query consulta = em.createQuery("UPDATE vehículos ... valor = menu.next(); em.getTransaction().begin(); Query consulta = em.createQuery("UPDATE " + entidad ... .nextLine(); em.getTransaction().begin(); Query consulta = em.createQuery("UPDATE " + "SET

Visibility of changes in Transaction is not visible to a JPA QL Query

     .lookup("java:comp/UserTransaction");    tx.begin();    SLSBObjDbRemote bean ... ");    tx.begin();    SLSBObjDbRemote bean = (SLSBObjDbRemote) context      .lookup("SLSBObjDb ... . what was there at the beginning of the transaction as then operated on by the subsequent transactional

Cannot save or update entity on Spring App

().begin(); em.persist(guest); em.getTransaction().commit(); em ... ()) em.getTransaction().begin(); em.merge(guest); em.getTransaction ... .getTransaction().isActive()) em.getTransaction().begin(); Query q = em

EntityTransaction.commit() does not release a pessimistic lock

.getTransaction().begin(); em.persist(new Account(0)); em.getTransaction().commit(); // update EntityManager em1 = emf.createEntityManager(); em1.getTransaction().begin ... .getTransaction().begin(); Account a2 = em2.find(Account.class, 0, LockModeType.PESSIMISTIC_READ

Best practise loading big data

(); // create values em.getTransaction().begin(); MyStepBlockCollection sbc ... = null; long counter = 0; em.getTransaction().begin(); sbc = em.find ... populateDatabase(EntityManager em) {         int valueCount = 0;          em.getTransaction().begin

Unexpected exception (Error 990) - Merge with no Transaction

);          EntityManager em = emf.createEntityManager();      em.getTransaction().begin ... ();      em.close();      em = emf.createEntityManager();      em.getTransaction().begin ... always fails for this use case. I can make the code work by beginning a transaction in the last step

Sometimes cascade persist does not work during commit

.setFlushMode(FlushModeType.AUTO); em.getTransaction().begin(); em.createQuery ... (FlushModeType.AUTO); em.getTransaction().begin(); Query query = em.createQuery ... with complete begin-commit transactions, then this indeed should work. support Support

ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection

it will report: Java/JVM version: 1.8 Java/JVM detail version: 1.8.0_74 ObjectDB enhancer: begin ... (); format().out("Persist project.."); em.getTransaction().begin(); em ... /JVM detail version: 1.8.0_74 ObjectDB enhancer: begin: (all classes within entity packages): javac

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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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