尝试实现 websockets 时出现 Failed to start bean 'subProtocolWebSocketHandler' 异常

Question

我正在使用 Spring 4 教程 here 浏览 websockets。我让它在客户端调用时服务器响应的地方工作。

但是，我的用例是让服务器推送消息而无需客户端调用。因此，我在网上查找了执行此操作的方法，发现 few posts that 说我需要使用一种叫做 SimpMessagingTemplate 的东西。所以我更改了代码以使用 SimpMessagingTemplate.

现在我在服务器控制台中得到这个异常：

04-Jun-2016 22:49:24.093 SEVERE [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed
 org.springframework.context.ApplicationContextException: Failed to start bean 'subProtocolWebSocketHandler'; nested exception is java.lang.IllegalArgumentException: No handlers
        at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:176)
        at org.springframework.context.support.DefaultLifecycleProcessor.access0(DefaultLifecycleProcessor.java:51)
        at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:346)
        at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:149)
        at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:112)
        at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:852)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
        at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4809)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5251)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3827)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:291)
        at org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:5608)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1377)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1381)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1381)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1349)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: No handlers
        at org.springframework.util.Assert.isTrue(Assert.java:68)
        at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.start(SubProtocolWebSocketHandler.java:251)
        at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:173)
        ... 20 more

我发现 and this post 有同样的问题，但其中 none 发布了真正的解决方案。

我的 websocket 控制器：

@Controller
public class WebSockController {

    private SimpMessagingTemplate template;

    @Autowired
    public WebSockController(SimpMessagingTemplate template) {
        this.template = template;
    }

    @MessageMapping("/hello")    
    public void greeting(GreetingsFromClient message) throws Exception {
        String[] messages = {"message1","message2","message3","message4","message5"};
        for(int i=0 ; i<messages.length ; i++){
            Thread.sleep(3000); // simulated delay
            this.template.convertAndSend("/topic/greetings", new GreetingsFromServer("Hello, " + messages[i] + "!"));
        }        
    }
}

我的 websocket 配置：

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig  implements WebSocketMessageBrokerConfigurer  {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/hello").withSockJS();
    }

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void configureClientOutboundChannel(ChannelRegistration arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean configureMessageConverters(List<MessageConverter> arg0) {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public void configureWebSocketTransport(WebSocketTransportRegistration arg0) {
        // TODO Auto-generated method stub

    }
}

此外，我还必须将 org.springframework.web.socket.config 添加到组件扫描中，因为如果没有它，我会得到一个自动接线异常 (ref)。

我正在使用 Spring 4.2.5 和 Tomcat 8.

感谢任何帮助。如果您需要更多信息，请告诉我。谢谢。

Answer 1

在为这个问题苦苦挣扎了几个小时之后，我通过将 websocket 配置添加到 rootconfig 解决了这个问题。

@Configuration
@ComponentScan({ "xxxxxx.xxxxxxxxx.controllers" })
@Import({SecurityConfig.class, WebSocketConfig.class, HibernateConfig.class})
public class RootConfig {

}

我的应用程序初始化程序使用根配置。

public class WebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[] { RootConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] { AppConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }
}

尝试实现 websockets 时出现 Failed to start bean 'subProtocolWebSocketHandler' 异常

Getting a Failed to start bean 'subProtocolWebSocketHandler' exception while trying to implement websockets

websocket

tomcat8

spring-websocket

spring-4