@RequestMapping("/") from Spring Boot Returns 404 pages only-CodePudding

In spring boot, there is no problem in any URL, such as localhost:8080/anything, but only in the default URL, such as localhost:8080/ or localhost:8080.

IDE is currently using Intellij.

This is not being done. I tried to grab a breakpoint to try debugging, but I didn't run that method in the first place

During debugging, it was confirmed whether a bean was generated or not, but it was confirmed that a bean was generated without problem.

This is not being done. I tried to grab a breakpoint to try debugging, but I didn't run that method in the first place

During debugging, it was confirmed whether a bean was generated or not, but it was confirmed that a bean was generated without problem.

@Slf4j
@Controller
public class HomeController {
    @RequestMapping("/")
    public String index(){
        return "index";
    }
}

It works normally. Whatever URI is set, it works fine.

@Slf4j
    @Controller
    public class HomeController {
        @RequestMapping("/anyting")
        public String index(){
            return "index";
        }
    }

My sauce is as follows What should I check?

Thank you in advance for your help.

CodePudding user response：

Try giving this it works:

@Slf4j
@Controller
public class HomeController {
    @GetMapping("")
    public String index(){
        return "index";
    }
}

CodePudding user response：

@Slf4j
@Controller
public class HomeController {
@RequestMapping(value="/",method = RequestMethod.GET) //try this
public String index(){
    return "index";
}
}

CodePudding user response：

You can try with the below approaches:

1) Use @Controller along with @ResponseBody

@Controller is used to mark classes as Spring MVC Controller.If you use only @Controller , you have to specify the @ResponseBody as well in each API methods.

@Controller
@Slf4j
public class HomeController {

  @RequestMapping("/")
  @ResponseBody
  public String index() {
    return "index";
  }

  @RequestMapping("/anything")
  @ResponseBody
  public String index2() {
    return "index";
  }

}

Output: The above code will return the "index" string as a response of this API.

If you want to show index.html page, then you have to modify your code as below and please note your index.html should be placed in resources/static folder.

@RequestMapping("/")
@ResponseBody
  public ModelAndView index() {
    return new ModelAndView("index.html");
  }

Output: This will redirect you to index.html page.

2) Use @RestController

@RestController annotation is a special controller used in RESTful Web services, and it's the combination of @Controller and @ResponseBody annotation. It is a specialised version of @Component annotation.

@RestController
@Slf4j
public class HomeController {

  @RequestMapping("/")
  public String index() {
    return "index";
  }

  @RequestMapping("/anything")
  public String index2() {
    return "index";
  }
}

Output: The above code will return the "index" string as a response of this API.

If you want to show index.html page, then you have to modify your code as below and please note your index.html should be placed in resources/static folder.

@RequestMapping("/")
  public ModelAndView index() {
    return new ModelAndView("index.html");
  }

Output: This will redirect you to index.html page.

CodePudding user response：

everyone. Thank you for answering my question.

but it didn't have solve on me.

Instead, we will solve it in another way and share it with you.

The first word of @xerx593, I got a hint from telling me to set the logging level to debug.

2022-10-13 16:54:01.710 DEBUG 79836 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : GET "/", parameters={}
2022-10-13 16:54:01.712 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ParameterizableViewController [view="forward:/index"]
2022-10-13 16:54:01.724 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, application/xhtml xml, image/avif, image/webp, image/apng, application/xml;q=0.9, application/signed-exchange;v=b3;q=0.9, */*;q=0.8]
2022-10-13 16:54:01.724 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.servlet.view.InternalResourceView  : View name 'forward:', model {}
2022-10-13 16:54:01.725 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.servlet.view.InternalResourceView  : Forwarding to [/index]
2022-10-13 16:54:01.728 DEBUG 79836 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : "FORWARD" dispatch for GET "/index", parameters={}
2022-10-13 16:54:01.734 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [static/], classpath [public/], classpath [], classpath [resources/], classpath [META-INF/resources/], classpath [META-INF/resources/webjars/]]
2022-10-13 16:54:01.736 DEBUG 79836 --- [nio-8080-exec-1] o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
2022-10-13 16:54:01.736 DEBUG 79836 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Exiting from "FORWARD" dispatch, status 404
2022-10-13 16:54:01.740 DEBUG 79836 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND

(Imports logs into snippet for viewing.)

If you check the log and approach "/", you are forwarding it to "/index".

So I changed the code to receive "/index" and process it.

@Slf4j
@Controller
public class HomeController {
    @RequestMapping("/index")
    public String index(){
        return "index";
    }
}

It works for me.

Thank you.