Spring boot convert web.xml listener - spring

Question

I'm trying to convert my project to Spring Boot project (executable jar file with Jetty embedded).
All works with a standard example but I want migrate my old web.xml to Spring Boot.
I migrated Servlet and Filters but I don't understand how migrate filters as this:
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<listener>
<listener-class>org.granite.config.GraniteConfigListener</listener-class>
</listener>
<listener>
<listener-class>org.granite.gravity.websocket.GravityWebSocketDeployer</listener-class>
</listener>
I created my #SpringBootApplication class and I wrote inside all the configuration:
#Bean
#Order(1)
public FilterRegistrationBean springSecurityFilterChain() {
FilterRegistrationBean filterRegBean = new FilterRegistrationBean();
DelegatingFilterProxy delegatingFilterProxy = new DelegatingFilterProxy();
filterRegBean.setFilter(delegatingFilterProxy);
List<String> urlPatterns = new ArrayList<String>();
urlPatterns.add("/*");
filterRegBean.setUrlPatterns(urlPatterns);
return filterRegBean;
}
Someone can explain me how Listeners should be converted?

Answer 1

Spring Boot will automatically register any #Beans of the following types with the servlet container:
ServletContextAttributeListener
ServletRequestListener
ServletRequestAttributeListener
HttpSessionAttributeListener
HttpSessionListener
ServletContextListener
For example, to register GravityWebSocketDeployer which is a ServletContextListener add a #Bean method to your configuration class:
#Bean
public GravityWebSocketDeployer gravityWebSocketDeployer() {
return new GravityWebSocketDeployer();
}

Answer 2

For RequestContext read this
#Bean
#ConditionalOnMissingBean(RequestContextListener.class)
public RequestContextListener requestContextListener() {
return new RequestContextListener();
}
For the other listener is register automatically when you use spring-boot as this link implies.
For your own listeners.
public class MyAdditionListeners extends SpringBootServletInitializer {
protected final Log logger = LogFactory.getLog(getClass());
#Override
public void onStartup(ServletContext servletContext) throws ServletException {
WebApplicationContext rootAppContext = createRootApplicationContext(servletContext);
if (rootAppContext != null) {
servletContext.addListener(new YourListenerHere());
}
else {
this.logger.debug("No ContextLoaderListener registered, as "
+ "createRootApplicationContext() did not "
+ "return an application context");
}
}
Finally there is a link in which you can find some information about listeners and SpringApplication class. Read section

Answer 3

Also Spring Boot will automatically register any #Bean extend of HttpServlet;
#Bean
public ServletRegistrationBean axisServletRegistrationBean() {
ServletRegistrationBean registration = new ServletRegistrationBean(new AxisServlet(), "/services/*");
registration.addUrlMappings("*.jws");
return registration;
}