No difference,
Struts 2 internally uses
Servlets and session ActionContext is implements using ThreadLocal so we can access session from ActionContext but we should use SessionAware interface to get session object.
ocjp 6 — Feeding a person with food is a great thing in this world. Feeding the same person by transferring the knowledge is far more better thing. The reason is the amount of satisfaction which we get through food is of only one minute or two. But the satisfaction which we can get through the knowledge is of life long.