HelloWorldSpring4Configuration

AppConfig.java

package com.hello;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = { "com.hello.controller", "com.hello.config" })
public class AppConfig {

}

ServletInitializer.java

package com.hello.config;

import javax.servlet.Filter;
import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.filter.HiddenHttpMethodFilter;
import org.springframework.web.filter.HttpPutFormContentFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import com.hello.AppConfig;
import com.hello.WebConfig;

public class ServletInitializer extends
    AbstractAnnotationConfigDispatcherServletInitializer {

  @Override
  protected Class<?>[] getRootConfigClasses() {
    return new Class[] { AppConfig.class };
  }

  @Override
  protected Class<?>[] getServletConfigClasses() {
    return new Class[] { WebConfig.class };
  }

  @Override
  protected String[] getServletMappings() {
    return new String[] { "/" };
  }

  @Override
  protected void customizeRegistration(Dynamic registration) {
    registration.setInitParameter("dispatchOptionsRequest", "true");
  }

  @Override
  protected Filter[] getServletFilters() {
    CharacterEncodingFilter charFilter = new CharacterEncodingFilter();
    charFilter.setEncoding("UTF-8");
    charFilter.setForceEncoding(true);
    return new Filter[] { new HiddenHttpMethodFilter(), charFilter,
        new HttpPutFormContentFilter() };
  }

}

WebConfig.java

package com.hello;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@EnableWebMvc
@Configuration
@ComponentScan(basePackages = "com.hello.controller")
public class WebConfig extends WebMvcConfigurerAdapter {

  @Override
  public void configureDefaultServletHandling(
      DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
  }

}