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<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
  <groupId>org.apache.tomcat.embed</groupId>
  <artifactId>tomcat-embed-jasper</artifactId>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>jstl</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-tomcat</artifactId>
  <scope>provided</scope>
</dependency>

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
  <title>Hello</title>
</head>
<body>
  THYMELEAF PAGE: <p th:text="${name}"></p>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Hello</title>
</head>
<body>
   JSP PAGE: Hello ${name}
</body>
</html>

spring.view.prefix= /WEB-INF/
spring.view.suffix= .jsp
spring.view.view-names= views/*
spring.thymeleaf.view-names= thymeleaf/*

package com.example.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class TestController {
    @GetMapping("/jasper")
    String jspPage(Model model,@RequestParam String name) {
        model.addAttribute("name", name);
        return "jsp/sample";
    }

    @GetMapping("/thymeleaf")
    String thymeleafPage(Model model,@RequestParam String name) {
        model.addAttribute("name", name);
        return "thymeleaf/sample";
    }
}

import org.springframework.web.servlet.view.JstlView;

@Configuration
public class SpringConfig {
@Value("${spring.view.prefix}")
private String prefix;

@Value("${spring.view.suffix}")
private String suffix;

@Value("${spring.view.view-names}")
private String viewNames;

@Bean
InternalResourceViewResolver jspViewResolver() {
    final InternalResourceViewResolver viewResolver = new
    InternalResourceViewResolver();
    viewResolver.setPrefix(prefix);
    viewResolver.setSuffix(suffix);
    viewResolver.setViewClass(JstlView.class);
    viewResolver.setViewNames(viewNames);
    return viewResolver;
 }
}