Java 提供多个端点的Cometd不能部署到同一路径[/Cometd]

我正在开发一个SpringMVC应用程序，试图将聊天功能与Cometd集成在一起。我得到一个错误，即不能在同一路径中部署多个端点

错误日志：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cometDInitializer.Processor': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.cometd.bayeux.server.BayeuxServer com.journaldev.spring.chat.CometDInitializer$Processor.bayeuxServer; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bayeuxServer' defined in class path resource [com/journaldev/spring/chat/CometDInitializer.class]: Invocation of init method failed; nested exception is java.lang.RuntimeException: javax.websocket.DeploymentException: Multiple Endpoints may not be deployed to the same path [/cometd]
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)

如果有人想要完整的错误日志

CometDiInitializer.java：

@Component
public class CometDInitializer implements ServletContextAware
{
    private ServletContext servletContext;

    @Bean(initMethod = "start", destroyMethod = "stop")
    public BayeuxServer bayeuxServer()
    {
        BayeuxServerImpl bean = new BayeuxServerImpl();
        bean.setTransports(new WebSocketTransport(bean), new JSONTransport(bean), new JSONPTransport(bean));
        servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bean);
        bean.setOption(ServletContext.class.getName(), servletContext);
        bean.setOption("ws.cometdURLMapping", "/cometd/*");
        return bean;
    }

    public void setServletContext(ServletContext servletContext)
    {
        this.servletContext = servletContext;
    }

    @Component
    public static class Processor implements DestructionAwareBeanPostProcessor
    {
        @Inject
        private BayeuxServer bayeuxServer;
        private ServerAnnotationProcessor processor;

        @PostConstruct
        private void init()
        {
            this.processor = new ServerAnnotationProcessor(bayeuxServer);
        }

        @PreDestroy
        private void destroy()
        {
        }

        public Object postProcessBeforeInitialization(Object bean, String name) throws BeansException
        {
            processor.processDependencies(bean);
            processor.processConfigurations(bean);
            processor.processCallbacks(bean);
            return bean;
        }

        public Object postProcessAfterInitialization(Object bean, String name) throws BeansException
        {
            return bean;
        }

        public void postProcessBeforeDestruction(Object bean, String name) throws BeansException
        {
            processor.deprocessCallbacks(bean);
        }
    }
}

HelloService.java：

@Named
@Singleton
@Service("helloService")
public class HelloService
{
    @Inject
    private BayeuxServer bayeux;
    @Session
    private ServerSession serverSession;

    @PostConstruct
    public void init()
    {
    }

    @Listener("/service/hello")
    public void processHello(ServerSession remote, ServerMessage message)
    {
        System.out.println("We recieved a helo msg");
        Map<String, Object> input = message.getDataAsMap();
        String name = (String)input.get("name");

        Map<String, Object> output = new HashMap<>();
        output.put("greeting", "Hello, " + name);
        remote.deliver(serverSession, "/hello", output);
    }
}

---

此异常是由您的设计引起的：

• 自注册后，BayeuxServer只能有一个实例

  bean.setOption("ws.cometdURLMapping", "/cometd/*");
  

  只能为一个实例调用

• 有多个@Inject注释。因此，会生成多个实例。每个@Inject一个实例

解决方案：添加@Singleton

@Bean(initMethod = "start", destroyMethod = "stop")
@Singleton
public BayeuxServer bayeuxServer()

现在只有一个BayeuxServer实例。所有@Inject都将获得相同的实例

这仅在实现支持JSR330的情况下有效。（对不起，春天不是！）

单身人士的硬编码方式：

private static BayeuxServer beanInstance;
public static synchronized BayeuxServer bayeuxServer()
{
    if (beanInstance != null)
        return beanInstance;
    BayeuxServerImpl bean = new BayeuxServerImpl();
    bean.setTransports(new WebSocketTransport(bean), new JSONTransport(bean), new JSONPTransport(bean));
    servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bean);
    bean.setOption(ServletContext.class.getName(), servletContext);
    bean.setOption("ws.cometdURLMapping", "/cometd/*");
    beanInstance = bean;
    return beanInstance;
}

---

这没有帮助，错误是一样的，下面是错误代码：我还尝试更改bean.setOptions第二个参数，但没有任何效果，我得到了相同的错误。

bean.setOption("ws.cometdURLMapping", "/cometd/*");

@Bean(initMethod = "start", destroyMethod = "stop")
@Singleton
public BayeuxServer bayeuxServer()

private static BayeuxServer beanInstance;
public static synchronized BayeuxServer bayeuxServer()
{
    if (beanInstance != null)
        return beanInstance;
    BayeuxServerImpl bean = new BayeuxServerImpl();
    bean.setTransports(new WebSocketTransport(bean), new JSONTransport(bean), new JSONPTransport(bean));
    servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bean);
    bean.setOption(ServletContext.class.getName(), servletContext);
    bean.setOption("ws.cometdURLMapping", "/cometd/*");
    beanInstance = bean;
    return beanInstance;
}