code: public void invalidateAll(final String sessionId)
      {
          // tell all contexts that may have a session object with this id to
          // get rid of them
          Handler[] contexts = _server.getChildHandlersByClass(ContextHandler.class);
          for (int i = 0; contexts != null && i < contexts.length; i++)
          {
              SessionHandler sessionHandler = ((ContextHandler) contexts[i]).getChildHandlerByClass(SessionHandler.class);
              if (sessionHandler != null)
              {
                  SessionManager manager = sessionHandler.getSessionManager();
                  if (manager != null && manager instanceof KeyValueStoreSessionManager)
                  {
                      ((KeyValueStoreSessionManager) manager).invalidateSession(sessionId);
                  }
              }
          }
      }
docs: /* ------------------------------------------------------------