在JPA + Spring中异常后回滚事务 [英] Roll back transaction after exception in JPA + Spring

问题描述

我在下面使用Spring和JPA和HIbernate。当抛出PersistenceException时，我想捕获它并返回错误消息，以便它不会传播给调用者。

  @Transactional 
 public String save（Object bean）{
 String error = null; 
 
尝试{
 EntityManager entityManager = getEntityManager（）; （int i = 0，n = entities.size（）; i< n; i ++）{
 entityManager.merge（entities.get（i））; 
 
。 
 
 
 catch（PersistenceException e）{
 error = e.getMessage（）; 
} 
 
返回错误; 
} 
  

但是我得到一个异常，指出 javax.persistence .RollbackException：标记为rollbackOnly的事务。我得到事务需要在异常后回滚，但当我捕获异常并且不想重新抛出时，如何回滚它它看起来没有办法回滚由Spring ORM管理的失败的事务处理。问题中显示的代码是一个服务类。将其持久化例程提取到单独的DAO类并使服务类句柄 PersistenceExceptions 取得了诀窍。

I'm using Spring and JPA with HIbernate underneath. When a PersistenceException is thrown, I want to catch it and return the error message so that it is not propagated up to the caller.

@Transactional
public String save(Object bean) {
    String error = null;

    try {
        EntityManager entityManager = getEntityManager();

        for (int i = 0, n = entities.size(); i < n; i ++) {
            entityManager.merge(entities.get(i));
        }
    }
    catch (PersistenceException e) {
        error = e.getMessage();
    }

    return error;
}

But I get an exception saying that javax.persistence.RollbackException: Transaction marked as rollbackOnly. I get that the transaction needs to be rolled back after an exception but how do I roll it back when I've catched the exception and do not want to re-throw it?

解决方案

It appears that there is no way to roll back a failed transaction managed by Spring ORM. The code shown in the question is a service class. Extracting its persistence routine to a separate DAO class and having the service class handle PersistenceExceptions did the trick.

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