code: public Object getSession(String id, int version, boolean isSessionAccess, Object xdCorrelator) {
          return getSession(id, version, isSessionAccess, false, xdCorrelator);
      }
docs: This method is invoked by the HttpSessionManagerImpl to get at the session
  or related session information. If the getSession is a result of a
  request.getSession
  call from the application, then the isSessionAccess boolean is set to true.
  Also if the version number is available, then it is provided. If not, then
  a value
  of -1 is passed in. This can happen either in the case of an incoming
  request
  that provides the session id via URL rewriting but does not provide the
  version/clone
  info or in the case of a isRequestedSessionIDValid call.
  <p>
  
  @param id
  @param version
  @param isSessionAccess
  tells us if the request came from a session access (user request)
  @return Object