Question

In this example, I don't know how to do rollback the transaction if a condition is verified. This is a Spring MVC application with JPA + Hibernate for persistence

In CartController:

@RequestMapping(value="/buy",method=RequestMethod.POST)
  public String buy(){
  CartDAO.buy();
  return "redirect:/";
 }//buy

In CartDAOImpl

@Transactional
public class CartDAOImpl implements CartDAO {

@PersistenceContext
private EntityManager em;

public void buy(){
 ....
 if(x !=y) throw new MyException();
 em.persist(Item);
 ....
}
}

In applicationContext-servlet.xml

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

What's the best solution to this problem? Sorry for my English

Answer 1

From Spring documentation about rolling back declarative transactions:

In its default configuration, the Spring Framework’s transaction infrastructure code only marks a transaction for rollback in the case of runtime, unchecked exceptions; that is, when the thrown exception is an instance or subclass of RuntimeException. ( Errors will also - by default - result in a rollback). Checked exceptions that are thrown from a transactional method do not result in rollback in the default configuration.

You can configure exactly which Exception types mark a transaction for rollback, including checked exceptions. The following XML snippet demonstrates how you configure rollback for a checked, application-specific Exception type.

Source: http://docs.spring.io/spring/docs/current/spring-framework-reference/html/transaction.html#transaction-declarative-rolling-back

Answer 2

您可以在@Transactional中声明希望Spring在您MyException被抛出时执行回滚：

@Transactional(rollbackFor=MyException.class)

Spring: how to rollback declarative transaction

2 个答案: