用Spring做事务管理，在配JPA的时候出问题，原来用Hibernate的时候就没问题的，换JPA就报这个错：no transaction in progress。

百度不到，google之，得解：

Use the spring transaction annotations (which must be enabled on the context) 
For getters use the @Transactional(propagation = Propagation.SUPPORTS). This will ensure a session will actually be openend. 
For create/update/delete use the @Transactional(propagation = Propagation.REQUIRED) to ensure that a either new transaction will be started, or the call on the DAO participates on the current transaction. 

原本只在IBaseDao上注明事务，现在要对每个方法都注解一下才可用，囧rz，不知道会是哪里出了问题。

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