Document configuration for spring boot application

Describe how to configure cometd with spring boot application.

@Configuration @EnableAutoConfiguration public class WebsocketConfiguration {

private static Logger logger = LoggerFactory.getLogger(WebsocketConfiguration.class);

@Bean
public JettyEmbeddedServletContainerFactory servletContainerFactory() {
    JettyEmbeddedServletContainerFactory factory = new JettyEmbeddedServletContainerFactory();

    factory.addServerCustomizers(new JettyServerCustomizer(){
        @Override
        public void customize(Server server) {
            try {
                WebSocketServerContainerInitializer.configureContext((WebAppContext)server.getHandler());
            } catch (ServletException e) {
                logger.error(e.getMessage());
            }
        }           
    });     
    return factory;
}

@Bean
public ServletRegistrationBean servletRegistrationBean(){
    CometDServlet cometdServlet = new CometDServlet();
    return new ServletRegistrationBean(cometdServlet,"/cometd/*");
}

@Bean
public FilterRegistrationBean filterRegistration() {
    FilterRegistrationBean filter = new FilterRegistrationBean();
    CrossOriginFilter crossOriginFilter = new CrossOriginFilter();
    filter.setFilter(crossOriginFilter);
    filter.setAsyncSupported(true);
    filter.setName("cross-origin");
    filter.addUrlPatterns("/cometd/*","/chat/template/*");
    return filter;
}

@Bean
public ServletContextInitializer initializer() {
    return new ServletContextInitializer() {
        @Override
        public void onStartup(ServletContext servletContext) throws ServletException {
            servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bayeuxServer(servletContext));
        }
    };
}

@Bean
public BayeuxServer bayeuxServer(ServletContext servletContext)
{
    BayeuxServerImpl bean = new BayeuxServerImpl();
    bean.addExtension(new org.cometd.server.ext.AcknowledgedMessagesExtension());
    bean.setOption(ServletContext.class.getName(), servletContext);
    bean.setOption("ws.cometdURLMapping", "/cometd/*"); 
    return bean;
}

}

[sbordet]

@jaypatel512 SpringBootServletInitializer implements WebApplicationInitializer and I was not able to make it work either. Probably something changed in Spring Boot. However, it works if you implement ServletContextInitializer. Try to dig into the Spring Boot documentation.

[sbordet]

It should be doable, as documented.

The idea is that instead of having AnnotationCometDServlet play the role of the dependency injection container, you let Spring do that, and only use ServerAnnotationProcessor to process CometD-specific annotations.