@Transaction is for use with Seam managed POJOs - so if you are using them, 
annotate the method.

anonymous wrote : I change that save() method to rollback transaction to 
prevent above problem, but it throws this exception:
  | 
  | java.lang.IllegalStateException: Illegal to call this method from injected, 
managed EntityManager
  | 
  | what is wrong with this?

Thats not how you control a CMT.  Read a book or some docs on the net about how 
to control CMT in EJB3.

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