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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

Extra uninitialised entities spawned on merge()

.createEntityManager();         em.getTransaction().begin();         Element root = new Element(null ... );                 if (DO_PERSIST_BEFORE_MERGE) {             em.getTransaction().begin();             em.persist(e);             em.getTransaction().commit();         }         em.getTransaction().begin

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

Optimistic Locking

: PersistenceManager pm = pmf.getPersistenceManager(); pm.currentTransaction().begin(); pm ... (); Counter c1 = pm1.getExtent(Counter.class).iterator().next(); pm1.currentTransaction().begin ... ().next(); pm2.currentTransaction().begin(); c2.increase(); // First user commits - succeeds

Empty temporary dat files in the temp folder

, begin a transaction, do some stuff (find, persist, remove …) and then commit or in the case of errors ... ().begin();   MyEntity myEntity = new MyEntity();   myEntity.name = "DBFILE: " + db;   em.persist ... .getTransaction().begin();   // do anything - access an entity   MyEntity myEntity = em.find(MyEntity

Left join fetch behaviour doesn't retrieve children?

();         if (! em.getTransaction().isActive()) {             em.getTransaction().begin ... .getTransaction().begin();   }   MyEntity e1 = new MyEntity("parent1");   e1.addChild(String.valueOf ... ()) {    em.getTransaction().begin();   }   // Write 100 000 entities with 1 child for each   for (int

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

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

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

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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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