To make set method auto translated into a UPDATE clause, the
entitymanager should be opened after a transaction begins.

@PersistenceUnit(unitName="example")
EntityManagerFactory emf;

EntityManager em;
try {
       ut.begin();
       EntityManager em= emf.createEntityManager();
       CourseBean updateCourse = em.find(CourseBean.class, new
Integer(1));
       updateCourse.setCourse("Magic");
       ut.commit();
   } catch (Exception e) {
       e.printStackTrace();
   } finally {
       if (em != null && em.isOpen()) {
           em.close();
      }
   }


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