See How do we get access to the session for ways to retrieve the session.

One way of invalidating a session; contributed by Ray Clough.

Session Invalidation
// Code fragment from class implementing SessionAware containing the 
// session map in a instance variable "session". Attempting to invalidate 
// an already-invalid session will result in an IllegalStateException.
if (session instanceof org.apache.struts2.dispatcher.SessionMap) {
    try {
        ((org.apache.struts2.dispatcher.SessionMap) session).invalidate();
    } catch (IllegalStateException e) {
        logger.error(msg, e);
    }
}
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