我遇到了使用EntityManager将元素持久化到数据库的问题.根据我发现的答案,我在DaoJpa中尝试了这4种方法来做这样的事情,但仍然失败了.在这里,我附上了我尝试的四种方式：

控制器部分代码：

   @Transactional 
   SmartProduct smartProduct = new SmartProduct();
            smartProduct.setName("Dove Soap");
            smartProductDao.persist(smartProduct);

1.
    DaoJpa：

 @Transactional
 public void persist(SmartProduct smartProduct) {
            entityManager.persist(smartProduct);

不行！

2.

@Transactional
public void persist(SmartProduct smartProduct) {
entityManager.persist(smartProduct);
entityManager.flush();

Exception I got: no transaction is in progress

3.

@Transactional
public void persist(SmartProduct smartProduct) {
EntityTransaction emTransaction = entityManager.getTransaction();
        emTransaction.begin();  
        entityManager.persist(smartProduct);
        emTransaction.commit();
        entityManager.close();

Exception I got:
Not allowed to create transaction on shared EntityManager – use Spring
transactions or EJB CMT instead

4.

@Transactional
public void persist(SmartProduct smartProduct) {
                    EntityManagerFactory emf = Persistence.createEntityManagerFactory("persistenceUnit");
                EntityManager em = emf.createEntityManager();
                EntityTransaction etx = em.getTransaction();
                etx.begin();
                em.persist(smartProduct);
                etx.commit();
                em.close();
                emf.close();

Exception I got:
The application must supply JDBC connections

有人可以帮我解决问题吗？提前谢谢了！

非常感谢JustinKSU的帮助.我在Spring上下文中添加了注释,然后它就解决了！
这是我的Spring上下文的上一个版本：

factorybean" id="entityManagerFactory">
        

factorybean" id="entityManagerFactory">