Websocket - IOException：打开的文件太多

Question

我使用Spring boot的WebSocketConfigurer来创建websocket，按照以下代码创建一个在线系统。我的用户将连接到它，它将继续跟踪他们的存在。

@Configuration
@EnableWebSocket
public class WebSocketServerConfiguration implements WebSocketConfigurer {

private final PresenceListener presenceListener;
Logger logger = Logger.getLogger(WebSocketServerConfiguration.class.getName());

@Autowired
public WebSocketServerConfiguration(StringRedisTemplate stringRedisTemplate){
    this.presenceListener = new PresenceListener(stringRedisTemplate);
}

@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
    registry.addHandler(new WebSocketHandler() {
        @Override
        public void afterConnectionEstablished(WebSocketSession session) throws Exception {
            logger.info("afterConnectionEstablished:"+session.toString());
        }

        @Override
        public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
            //Some code inside
        }

        @Override
        public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
            logger.info("handleTransportError:" +session.toString());
        }

        @Override
        public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
            logger.info("afterConnectionClosed:"+session.toString());
        }

        @Override
        public boolean supportsPartialMessages() {
            return false;
        }
    }, "/presence").setAllowedOrigins("*");
}

}

部署后一段时间后，我开始关注例外：

java.io.IOException: Too many open files
at sun.nio.ch.ServerSocketChannelImpl.accept0(java.base@9-internal/Native Method) ~[na:na]
at sun.nio.ch.ServerSocketChannelImpl.accept(java.base@9-internal/ServerSocketChannelImpl.java:424) ~[na:na]
at sun.nio.ch.ServerSocketChannelImpl.accept(java.base@9-internal/ServerSocketChannelImpl.java:252) ~[na:na]
at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:443) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
at java.lang.Thread.run(java.base@9-internal/Thread.java:804) [na:na]

请帮助解决这个问题。