How to define and in servlet 3.0's web.xml-less?

Question

I have existing web-app which I want to convert into web.xml-less of servlet\'s 3.0. I\'ve managed to make it working, however there are 2 tags in web.xml which I still don\

Answer 1

In Spring Boot or general Spring MVC app for following scenario:

Static files can be served from locations registered with a custom ResourceHandlerRegistry. We have a static resource index.html and it can accessed at localhost:8080/index.html. We want to just redirect localhost:8080/ request to localhost:8080/index.html, following code will can be used.

package in.geekmj.config;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.servlet.config.annotation.EnableWebMvc;

import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;

import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
@EnableWebMvc
public class WebConfiguration extends WebMvcConfigurerAdapter {

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/",
        "classpath:/resources/", "classpath:/static/", "classpath:/public/" };

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/**").addResourceLocations(CLASSPATH_RESOURCE_LOCATIONS);
}

@Override
public void addViewControllers(ViewControllerRegistry registry) {
    registry.addRedirectViewController("/", "/index.html");
}
}

Now accessing localhost:8080/ will redirect to localhost:8080/index.html