ApplicationInitializer.java

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

Destroyed.java

@Qualifier
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.PARAMETER})
public @interface Destroyed {}

Initialized.java

@Qualifier
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.PARAMETER})
public @interface Initialized {}

ServletContextLifecycleNotifier.java

@WebListener
public class ServletContextLifecycleNotifier implements ServletContextListener
{
   @Inject @Any
   private Event<ServletContext> servletContextEvent;
   
   @Override
   public void contextInitialized(ServletContextEvent sce)
   {
      servletContextEvent.select(new AnnotationLiteral<Initialized>() {}).fire(sce.getServletContext());
   }

   @Override
   public void contextDestroyed(ServletContextEvent sce)
   {
      servletContextEvent.select(new AnnotationLiteral<Destroyed>() {}).fire(sce.getServletContext());
   }
}