spring boot application run, but I get error 404 in the web browser

spring boot application run, but I get 404 error in web browser, for frontend I have used jsp. The app was developed in spring mvc then I converted it to spring boot. after conversion is run as expected, but I do not see the data in browser. "This application has no explicit mapping for /error, so you are seeing this as a fallback.
Thu May 28 18:07:37 GMT-06:00 2020
There was an unexpected error (type=Not Found, status=404).
No message available"

I have a WebMvcConfigurer class, it contains my view resolver do I needs it?
Thymeleaf does not need a view Reslover, is it the same for jps, too?
here my class:

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.UrlBasedViewResolver;

import thursday.com.todolist.util.ViewNames;



public class WebConfig implements WebMvcConfigurer {
    private static final String RESOLVER_PREFIX = "/templates/WEB-INF/view/";
    private static final String RESOLVER_SUFFIX = ".jsp";

    @Bean
    public ViewResolver viewResolver(){
        UrlBasedViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix(RESOLVER_PREFIX);
        viewResolver.setSuffix(RESOLVER_SUFFIX);
        return viewResolver;
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName(ViewNames.HOME);
    }
}

Yeah you do need the suffix and prefix for the view resolver as the internal view resolver uses the prefix and suffix to make a logical mapping for your view , but you could also provide it in the application.properties file like :

spring.mvc.view.prefix = /WEB-INF/classes/templates
spring.mvc.view.suffix = .jsp

Also, Embedded Tomcat package (which is used in springboot to create executable jar)does not include JSP by default, we must add the module “org.apache.tomcat.embed:tomcat-embed-jasper” as dependency as well.The reason why we are adding tomcat-embed-jasper as dependency in springboot, is that we can use the jstl tags in jsp.The jsp files needs to be transpiled into html.

• Also, since you moved to spring-boot from spring mvc make sure you
  removed the annotation @EnableWebMvc from your project as this will
  disable all spring-boot autoconfigurations.Unless, you are explicitly providing it yourself to handle all configurations manually like in spring-mvc.
• Also spring-boot and JSP quite doesn't work together with jar as the packaging so try to use war packaging if you are using jsp as the view template.The contents of the webapp folder is automatically taken up during build only if you keep the packaging as war .