How do we Bootstrap via Java base classes not using web.xml

• Create a class that extends "AbstractAnnotationConfigDispatcherServletInitializer".
• This class will be instantiated when tomcat starts.
• There are three abstract methods in this class
• getRootConfigClasses()
• Used to create Root Application Context such as Dispatcher Servlet
• getServletConfigClasses()
• Used to create Servlet Application Context.
• getServletMappings()
• Used to create URL Mappings for a servlet.

SimpleWebAppInitializer

 package com.springimplant.mvc.config;  
 import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;  
 public class SimpleWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {  
      @Override  
      protected Class<?>[] getRootConfigClasses() {  
           return new Class[]{SimpleWebConfiguration.class};  
      }  
      @Override  
      protected Class<?>[] getServletConfigClasses() {  
           return null;  
      }  
      @Override  
      protected String[] getServletMappings() {  
           return new String[] {"/entry/*"};  
      }  
 }  

SimpleWebContext(Dispatcher Servlet Class)

 package com.springimplant.mvc.config;  
 import org.springframework.context.annotation.ComponentScan;  
 import org.springframework.context.annotation.Configuration;  
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;  
 @Configuration  
 @EnableWebMvc  
 @ComponentScan(basePackages="com.springimplant.mvc.controllers")  
 public class SimpleWebConfiguration {  
 }