由于错误的InternalResourceViewResolver视图名称，Spring MVC返回404

Question

I am new on Spring MVC & Boot. I can open http://localhost:8088/postList but I am experiencing Whitelabel Error Page error when opening http://localhost:8088/post/1 . I can't find my mistake. Can you say it?

My project structure

My InternalResourceViewer:

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

My Controller:

@Controller
@RequestMapping("/")
public class PostController 
{

@Autowired
PostService postService;

@RequestMapping(value="/post/{id}", method=RequestMethod.GET)
public ModelAndView list(@PathVariable("id") int id){

    ModelAndView mav=new ModelAndView("post");

    Post postItem=postService.getPostById(id);
    mav.addObject("postItem",postItem);

    mav.addObject("postItem",postItem);

    return mav;
}

@RequestMapping(value="/postList", method=RequestMethod.GET)
public ModelAndView postlist(){

    ModelAndView mav=new ModelAndView("postList");
    mav.addObject("postList",postService.listPosts());

    return mav;
}


}

My PostList:

My Post viewing page:

My postList.jsp taglibs and contents:

  <div class="row"> <c:if test="${not empty postList}"> <c:forEach var="postItem" items="${postList}"> <div class="col-lg-8"> <h1><a href="<c:url value='/post/${postItem.id}' />">${postItem.header}</a></h1> <p class="lead"> by <a href="#">${postItem.user_id}</a> </p> <p><span class="glyphicon glyphicon-time"></span>${postItem.upddate}</p> <hr> </div> </c:forEach> </c:if> 

Answer 1

The short answer is that you need a leading / in your InternalResourceViewResolver prefix. So

resolver.setPrefix("/WEB-INF/views/");

The long answer is that Spring MVC uses the InternalResourceViewResolver to generate a View , in this case a JstlView . Spring MVC then tries to render this View .

To do so, it uses the view name (the prefix, the name in your ModelView , and the suffix, ie. WEB-INF/views/post.jsp ), as a path and tries to retrieve a RequestDispatcher by delegating to ServletRequest#getRequestDispatcher(String) .

The pathname specified may be relative , although it cannot extend outside the current servlet context. If the path begins with a "/" it is interpreted as relative to the current context root. This method returns null if the servlet container cannot return a RequestDispatcher .

Since you don't have a leading / , it is relative to the current path, ie. /post/1 . That makes it /post/WEB-INF/views/post.jsp . And since you have no such resource relative to the ServletContext , your Servlet container returns a 404.