org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has

ERROR: org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only

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1. @Transactional  
2.     public void foo() {  
3.         try{  
4.             bar();  
5.         } catch (RuntimeException re) {  
6.             // caught but not throw further  
7.               
8.         }  
9.           
10.     }  
11.   
12.     @Transactional  
13.     public void bar() {  
14.           
15.     }  

如果foo在调用bar的时候，bar抛出RuntimeException，Spring在bar return时将Transactional标记为Rollback only， 而foo捕获了bar的RuntimeException，所以Spring将会commit foo的事务，但是foo和bar使用的是同一事务，因此在commit foo事务时，将会抛出UnexpectedRollbackException。注意：如果foo和bar在同一class中，不会出现这种情况，因为：

Since this mechanism is based on proxies, only 'external' method calls coming in through the proxy will be intercepted. This means that 'self-invocation', i.e. a method within the target object calling some other method of the target object, won't lead to an actual transaction at runtime even if the invoked method is marked with @Transactional!

可以通过配置log4j来debug Spring事务获取情况：
To delve more into it I would turn up your log4j logging to debug and also look at what ExerciseModuleController is doing at line 91, e.g.: add a logger for org.springframework.transaction