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Cascading merge() leading to "Attempt to persist a reference to a non managed instance" error

();     tx.begin();     em.merge(new Child(new Parent("Joe")));     em.merge(new Child(new Parent("Tim
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ClassCastException: cannot be cast to com.objectdb.spi.TrackableUserType

.currentTransaction() try { transaction.begin() pm
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Conflicting modifiers .... (javax.persistence.Id, javax.persistence.ManyToOne)

.getTransaction().begin(); Container container = Container.getInstance(em); container.generateMapItems(1, em
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CriteriaQuery .where() for multiple conditions

().begin(); CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder
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Dependency from enhanced classes to the objectDB library

();         em.getTransaction().begin();         em.persist(new E1());         em.persist(new E2
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Drop in Client/server mode not working

");         EntityManager em = emf.createEntityManager();         em.getTransaction().begin();         em.persist
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Eager Fetch of Map with Entities as Keys

.createEntityManager();         em.getTransaction().begin();         MyEntity entity = new MyEntity
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Entity has be persistended,but query not fetched?

.odb");         EntityManager em = emf.createEntityManager();         em.getTransaction().begin
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EntityManager JPA or JDO impl and different behavior

.getTransaction().begin();         Holder holder = new Holder();         holder.listOfNames.add(new
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EntityManager refresh problem

.getTransaction().begin();             SimpleEntity simpleEntity1 = new SimpleEntity