Spring 下默认事务机制中@Transactional 无效的原因

Spring中 @Transactional 注解的限制
1. 同一个类中, 一个nan-transactional的方法去调用transactional的方法, 事务会失效

If you use (default) Spring Proxy AOP, then all AOP functionality provided by Spring (like @Transational) will only be taken into account if the call goes through the proxy. -- This is normally the case if the annotated method is invoked from another bean.

2. 在private方法上标注transactional, 事务无效

When using proxies, you should apply the @Transactional annotation only to methods with public visibility. If you do annotate protected, private or package-visible methods with the @Transactional annotation, no error is raised, but the annotated method does not exhibit the configured transactional settings. Consider the use of AspectJ (see below) if you need to annotate non-public methods.

这里有一个详细的说明 http://stackoverflow.com/questions/4396284/does-spring-transactional-attribute-work-on-a-private-method