Spring Web Application: Post-DispatcherServlet initialization - spring

Question

I am using Spring 3.2 DispatcherServlet. I am looking for an initialization hook that takes place after the DispatcherServlet initialization completes; either a standard Spring solution or servlet solution. Any suggestions?
As a point of reference, the final logging statements after servlet startup follow. I want my initialization method to execute right after the configured successfully log statement.
DEBUG o.s.w.s.DispatcherServlet - Published WebApplicationContext of servlet 'mySpringDispatcherServlet' as ServletContext attribute with name [org.springframework.web.servlet.FrameworkServlet.CONTEXT.mySpringDispatcherServlet]
INFO o.s.w.s.DispatcherServlet - FrameworkServlet 'mySpringDispatcherServlet': initialization completed in 5000 ms
DEBUG o.s.w.s.DispatcherServlet - Servlet 'mySpringDispatcherServlet' configured successfully
From my research, so far the following have not had the desired effect:
Extending ContextLoaderListener/implementing ServletContextListener per this answer.
Implementing WebApplicationInitializer per the javaoc.
My beans use #PostConstruct successfully; I'm looking for a Servlet or container level hook that will be executed essentially after the container initializes and post-processes the beans.

Answer 1

The root issue was that I couldn't override the final method HttpsServlet.init(). I found a nearby #Override-able method in DispatcherServlet.initWebApplicationContext that ensured my beans and context were fully initialized:
#Override
protected WebApplicationContext initWebApplicationContext()
{
WebApplicationContext wac = super.initWebApplicationContext();
// do stuff with initialized Foo beans via:
// wac.getBean(Foo.class);
return result;
}

Answer 2

From Spring's Standard and Custom Events.
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;
#Component
public class ApplicationContextListener implements
ApplicationListener<ContextRefreshedEvent> {
#Override
public void onApplicationEvent(ContextRefreshedEvent event) {
System.out.println("ApplicationContext was initialized or refreshed: "
+ event.getApplicationContext().getDisplayName());
}
}
The event above will be fired when the DispatcherServlet is initialized, such as when it prints:
INFO org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'ServletName': initialization completed in 1234 ms

Answer 3

You can implement ApplicationListener<ContextStartedEvent> within your application context. This event listener will then be called once for your root context and once for each servlet context.
public class StartupListener implements ApplicationListener<ContextStartedEvent> {
public void onApplicationEvent(ContextStartedEvent event) {
ApplicationContext context = (ApplicationContext) event.getSource();
System.out.println("Context '" + context.getDisplayName() + "' started.");
}
}
If you define this listener within your servlet context, it should be called just once for the servlet context intself.

Answer 4

try this, change your port number.
In my case i changed from server.port=8001 to server.port=8002