A bridge between the ServletContext life cycle events and CDI observers (with example observer ApplicationInitializer)

ApplicationInitializer.java

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.Initialized;
import javax.enterprise.event.Observes;
import javax.servlet.ServletContext;

// uncomment line if you want the instance to be retained in application scope
// @ApplicationScoped 
public class ApplicationInitializer
{
   public void onStartup(@Observes @Initialized(ApplicationScoped.class) ServletContext ctx)
   {
      System.out.println("Initialized web application at context path " + ctx.getContextPath());
   }
}

ServletContextLifecycleNotifier.java

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.Destroyed;
import javax.enterprise.context.Initialized;
import javax.enterprise.event.Event;
import javax.enterprise.inject.Any;
import javax.inject.Inject;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.lang.annotation.Annotation;

@WebListener
public class ServletContextLifecycleNotifier implements ServletContextListener
{
   @Inject @Any
   private Event<ServletContext> servletContextEvent;
   
   @Override
   public void contextInitialized(ServletContextEvent sce)
   {
      servletContextEvent.select(new Initialized() {
            @Override
            public Class<? extends Annotation> annotationType() {
                return Initialized.class;
            }
            @Override
            public Class<? extends Annotation> value() {
                return ApplicationScoped.class;
            }
        }).fire(sce.getServletContext());
   }

   @Override
   public void contextDestroyed(ServletContextEvent sce)
   {
      servletContextEvent.select(new Destroyed(){
            @Override
            public Class<? extends Annotation> annotationType() {
                return Destroyed.class;
            }
            @Override
            public Class<? extends Annotation> value() {
                return ApplicationScoped.class;
            }
        }).fire(sce.getServletContext());
   }
}

A variant of https://gist.github.com/mojavelinux/637959 with the qualifiers replaced by the ones from package javax.enterprise.context.