Basic Servlet initializer for Spring to replace web.xml in Servlet 3 containers (Tomcat 7, Jetty 8, etc.)

ServletInitializer.java

import javax.servlet.ServletContext;
import javax.servlet.ServletRegistration;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class ServletInitializer implements WebApplicationInitializer {

  @Override
  public void onStartup(ServletContext container) {
    //Register any @Configuration classes. Could use xml instead but that's no fun.
    AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
    ctx.register(AppConfig.class, WebConfig.class);

    //Create and configure the dispatcher servlet
    ServletRegistration.Dynamic dispatcher = container.addServlet("dispatcher",
        new DispatcherServlet(ctx));

    dispatcher.setLoadOnStartup(1);
    dispatcher.addMapping("/");
  }
}