@Before public void insert20Elements() { EntityTransaction transaction = em.getTransaction(); transaction.begin(); for (int i = 0; i < 20; i++) { vehicleMasterAdd = new VehicleMaster(); vehicleMasterAdd.setId(99999l + i); vehicleMasterAdd.setUserIns("testADD" + i); vehicleMasterAdd.setDateIns(new Date()); vehicleMasterAdd.setDescription("testDescription" + i); vehicleMasterAdd.setActive(true); em.persist(vehicleMasterAdd); } transaction.commit(); }