java - @Transactional 测试失败

Question

我尝试为@Transactional.

@ContextConfiguration(locations = {"classpath:/META-INF/spring/app-context.xml" })
@RunWith(SpringJUnit4ClassRunner.class)
public class TransactionalAnnotationTest {
    public static final BigDecimal PROD_ID = new BigDecimal(1234);

    @PersistenceContext
    HibernateEntityManager em;


    @Test
    public final void testTransactionIsolation() {
        String original = em.find(ProductImpl.class, PROD_ID).getDescription();
        // original = "Foo"
        updateTx(original);
    }

    @Transactional
    public final void updateTx(String original) {
        ProductImpl product = em.find(ProductImpl.class, PROD_ID);
        product.setDescription("Bar");
        whatIsInDB(original);
    }

    private void whatIsInDB(String original) {
        String sameTxDescription = em.find(ProductImpl.class, PROD_ID).getDescription();
        assert !sameTxDescription.equals(original);
    }
}

它失败了！第二个em.find不应该返回带有“Bar”的产品吗？

Answer 1

设置“描述”字段后尝试显式刷新上下文

product.setDescription("Bar");
em.flush();
whatIsInDB(original);

Answer 2

嗯，我得到它的工作。

1. 测试交易：em.flush()我只需要一个简单的东西（感谢@TaoufikMohdit 的想法）。如果没有交易，flush()抛出一个TransactionRequiredException！

2. @Transactional仅适用于 Spring-Managed-Beans。所以我创建了一个服务：

   @Service
   public class BasicTransactionalService {
     @PersistenceContext
     HibernateEntityManager em;
   
     @Transactional
     public void testFlushInTransactional() {
       em.flush();
     }
   
     @Deprecated
     public void testFlushOutsideTransactional() {
       em.flush();
     }
   
     @Transactional
     public void testFlushSubroutineTransactional() {
       testFlushOutsideTransactional();
     }
   }
   

3. 我将测试更改为：

   @Autowired
   BasicTransactionalService bean;
   
   @Test
   public void testTransactionIsolation() {
     bean.testFlushInTransactional();
   }
   
   @Test(expected = TransactionRequiredException.class)
   @SuppressWarnings("deprecation")
   public void testThrowsTransactionRequiredException() {
     bean.testFlushOutsideTransactional();
   }
   
   @Test
   public void testTransactionalSubroutine(){
     bean.testFlushSubroutineTransactional();
   }
   

现在它工作正常。

顺便说一句，这是我的app-config.xml

<beans>
  <bean class="BasicTransactionalService" />
  <bean class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean" />
  <bean class="org.springframework.orm.jpa.JpaTransactionManager" />
  <tx:annotation-driven />
<beans>