package com.example.controller; import org.springframework.messaging.handler.annotation.MessageMapping; import org.springframework.messaging.handler.annotation.SendTo; import org.springframework.stereotype.Controller; @Controller public class SessionTimeoutController { @MessageMapping("/check-inactivity") @SendTo("/topic/session-timeout") public String checkInactivity(String userId) { // Logic to check inactivity (e.g., based on userId) return "Session timed out due to inactivity. Please log in again."; } }