Default welcome file without web.xml

WebConfig.java

public class WebConfig extends WebMvcConfigurerAdapter {

  @Resource
  private Environment environment;

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

  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("index");
  }

  @Bean
  public ViewResolver viewResolver() {
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
    viewResolver.setSuffix(".html");
    return viewResolver;
  }

  public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry
      .addResourceHandler("/**").addResourceLocations(environment.getProperty("webapp.resource.location"))
      .resourceChain(true).addResolver(new GzipResourceResolver())
      .addTransformer(new CssLinkResourceTransformer());
  }
}