We are using struts 1.2.9 and springs. I have one issue. Action messages (some error message and information to the user) of one user is available to another user who is also working on the application. He may do some other action.
It looks like you may have coded your action classes in a non-threadsafe way. In Struts 1, actions are shared across multiple threads, so they must be coded as threadsafe. This means no instance variables unless they contain values that do not change from one user to the next.