红帽全球峰会4.4. 返回重新主动值的方法
如果使用 @Transactional 注解的方法返回重新主动值，则它不会终止事务，直到返回的重新主动值被终止为止。当重新主动值以异常终止时，事务会被标记为回滚，否则会提交事务。
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