解决sprinboot启动报Failed to start bean ‘subProtocolWebSocketHandler‘;

Failed to start bean 'subProtocolWebSocketHandler'; nested exception is java.lang.IllegalArgumentException: No handlers

  • 问题发现
  • 问题解决

问题发现

使用springboot整合websocket,启动时报错,示例代码:

@EnableWebSocket
@Configuration
public class WebSocketConfig implements WebSocketConfigurer {
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
        webSocketHandlerRegistry.addHandler(myWebSocketHandler(),"/ws").addInterceptors(new MyHandshakeInterceptor());
    }
    @Bean
    public WebSocketHandler myWebSocketHandler() {
        return new MyWebSocketHandler();
    }

    @Bean
    public ServletServerContainerFactoryBean createWebSocketContainer() {
        ServletServerContainerFactoryBean container = new ServletServerContainerFactoryBean();
        container.setMaxBinaryMessageBufferSize(8192); // 设置二进制消息缓冲区大小
        container.setMaxTextMessageBufferSize(8192); // 设置文本消息缓冲区大小
        container.setAsyncSendTimeout(5000l); // 设置异步发送超时时间(毫秒)
        // 其他配置项...

        return container;
    }
}
public class MyWebSocketHandler extends TextWebSocketHandler {

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        // 处理接收到的文本消息
        String payload = message.getPayload();
        System.out.println("接收到消息:" + payload);

        // 发送响应消息
        session.sendMessage(new TextMessage("Hello, client!"));
    }

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        // WebSocket 连接建立时执行的操作
        System.out.println("WebSocket 连接已建立");
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        // WebSocket 连接关闭时执行的操作
        System.out.println("WebSocket 连接已关闭");
    }
}
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketBrokerConfigurer implements WebSocketMessageBrokerConfigurer {

}

如图所示:

解决sprinboot启动报Failed to start bean ‘subProtocolWebSocketHandler‘;_第1张图片

问题解决

在上述代码中可以看到有两个注解,@EnableWebSocketMessageBroker@EnableWebSocket,同时使用,导致配置错误引起的。由于这两个注解都启用了 WebSocket 功能,因此同时使用它们可能会导致冲突。

两者取其一即可,我们将@EnableWebSocketMessageBroker 删掉,暂时不用基于消息代理。重新启动后,如图:

解决sprinboot启动报Failed to start bean ‘subProtocolWebSocketHandler‘;_第2张图片

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