                        课程
                    
                        /后端开发
                        
                            /Java
                        
                        /WebSocket入门与案例实战

跑起来报错Unexpected error occurred in scheduled task是怎么回事？

Unexpected error occurred in scheduled task
java.lang.IllegalStateException: The WebSocket session [0] has been closed and no method (apart from close()) may be called on a closed session