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	Multi-thread access to single EM's entities ; em.getTransaction().begin(); ... (); em.getTransaction().begin();
	remove & persist in same transaction => Attempt to reuse an existing primary key value ); System.out.println("create and persist"); em.getTransaction().begin(); EntityA entity = new EntityA(1); em ... .getTransaction().begin(); EntityA persitedEntity = em.find(EntityA.class, 1); em.remove
	EntityManager.find(entityClass, primaryKey) is slow when accessing non-existent IDs ; out.println("\nWRITE\n"); t = t2 = now(); em.getTransaction().begin ... ()); clear(em); t2 = now(); em.getTransaction().begin
	"where in" query ; em.getTransaction().begin(); ... .getTransaction().begin(); for (int i = 0; i < 5; i
	client server mod of communication .getTransaction().begin(); gtr = new Getter(1, "john ... ; em.getTransaction().begin();
	Cannot sort descending, when ordering by caluculated float in a method ; em.getTransaction().begin(); ... "); EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); Invoice i1
	@Transient .getTransaction().begin(); odb.persist(agency); odb
	problem when primary key value is zero ; em.getTransaction().begin();
	Merge throw exception "Attempt to reuse an existing primary key value" ; em.getTransaction().begin(); em.persist(new MyEntity ... ; em.getTransaction().begin(); em
	[ObjectDB 2.4.1] Unexpected exception (Error 990) on getObjectById ; pm.currentTransaction().begin(); ... ; pm.currentTransaction().begin();