Spring MVC cannot resolve .jsp files

Firstly, thank you for your time! I'm a 100% beginner on Spring MVC, and I got a feeling that this problem is caused by some stupid mistakes. I'm trying to build a RESTful Web Service. I followed the instructions from spring.io and made the "hello project" (http://localhost:8080/greeting) works.

However, when I was trying to let spring mvc resolve one of my view (.jsp). It's said

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Wed Mar 25 01:31:04 EDT 2015 There was an unexpected error (type=Not Found, status=404). No message available

I'm not sure why this always happens, because I already have a config file as below.

@Configuration
@EnableWebMvc
@ComponentScan(basePackages="config")
public class WebConfig extends WebMvcConfigurerAdapter {


    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

}

The whole directory tree of my project is:

src-main|- java   |- config  |-  WebConfig.java

                  |- hello   |-  Application.java
                             |-  Greeting.java
                             |-  GreetingController.java
                             |-  PMethodController.java

        |- webapp |- WEB-INF |-  views   |-  pmethod.jsp
                             |-  web.xml

I copied the web.xml from my friends. This file works fine on his project.

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://ift.tt/nSRXKP"
         xmlns:xsi="http://ift.tt/ra1lAU"
         xsi:schemaLocation="http://ift.tt/nSRXKP http://ift.tt/LU8AHS">

    <servlet>
        <servlet-name>mvc-Dispatcher</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
            <param-name>contextClass</param-name>
            <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
        </init-param>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>config</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>mvc-Dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>/</welcome-file>
    </welcome-file-list>
</web-app>

and my PMethodController.java:

@Controller
public class PMethodController{

    @RequestMapping("/method1")
    public String handleRequest() {
        return "pmethod";
    }


}

My Application.java

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

Depends on all above, If I run the project and then type http://localhost:8080/method1 It will show me the Whitelabel Error Page at the top of the page.

Thank you again for your time!