@Transactional testing fails

Question

I try to create testcases for @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);
    }
}

It fail! Should the second em.find not return a Product with "Bar"?

Answer 1

Hm, i got it to work.

1. To test Transactions: a simple em.flush() is all i need (thanks to @TaoufikMohdit for the idea). If there is no transaction, flush() throws a TransactionRequiredException!

2. @Transactional is for Spring-Managed-Beans only. So i create a Service:

   @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. I changed the Tests to:

   @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();
   }
   

Now it works fine.

BTW This is my 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>

Answer 2

Try explicitly flushing the context after setting the "description" field

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