tomcat version is 8.5.24

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

@Configuration
@ComponentScan("com.awesome")
@EnableWebMvc
open class AppConfig : WebMvcConfigurerAdapter() {

@Bean
open fun viewResolver(): InternalResourceViewResolver {
    val internalResourceViewResolver = InternalResourceViewResolver()
    internalResourceViewResolver.setSuffix(".jsp")
    internalResourceViewResolver.setPrefix("/")
    return internalResourceViewResolver
}

override fun configureDefaultServletHandling(configurer: DefaultServletHandlerConfigurer?) {
    configurer?.enable()
    }
 }

@Controller
class HomeController {

@RequestMapping("/", method = [(RequestMethod.GET)])
fun displayLoginPage(): String {
    return "login"
}

@RequestMapping("/login", method = [(RequestMethod.POST)])
fun login(@RequestParam user_name:String, @RequestParam password: String, modelMap: ModelMap): String {
    return "main"
    }
}