public Long getLoggedUserId() {
    HttpSession session = getRequest().getSession(false);
    return session == null ? null : (Long) session.getAttribute("loggedUserId");
  }
public Long getLoggedUserId ( ) { HttpSession session = getRequest ( ) . getSession ( false ) ; return session == null ? null : ( Long ) session . getAttribute ( "loggedUserId" ) ; }
Returns the identifier of the logged in user. If the user hasn't logged in, returns
<code>null</code>.

@return The identifier of the logged in user, or <code>null</code> if the user hasn't logged in