Spring Customize whitelabel error - redirect

Question

I am trying to customize /error by implementing Error controller in a class annonated with RestController.

The Spring Boot app includes autoconfiguration Library and does not explicitly set or use MVC.

@RequestMapping("/error")
public String handler(){
return "Error Occurred";
}

The above code works fine when the error status is 401 and 404.

@RequestMapping("/error")
public void handler(HttpServletResponse response)
{
response.sendRedirect("http://<url>/home");
return;// edit: Even adding this statement is just setting location but not redirecting.
}

This is setting location in response with redirect url but not redirecting.

Requirement is to map the /error to external UI page.

Now, when I use, redirectview or responsentity, then, the logic in handler only works when /error is invoked manually and 404 is not invoking /error. It just says This page is not found. Can someone tell me is this because of autoconfiguration Library or am I missing anything?

Amit kumar · Answer 1 · 2020-07-05T17:02:19.777

0

Adding this entry to the application.properties file : server.error.whitelabel.enabled=false. This will disable the white label error page entirely.

A Custom Error Controller :

 @RequestMapping("/error")
 public String handleError(HttpServletRequest request) {
 Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);

 if (status != null) {
     Integer statusCode = Integer.valueOf(status.toString());

     if(statusCode == HttpStatus.NOT_FOUND.value()) {
         return "error-404";
     }
     else if(statusCode == HttpStatus.UNAUTHORIZED).value()) {
         return "error-401";
     }
 }
 return "error";

}

You can add html pages for the respective errors.

Example : For a 404 error, User will see error-404.html page.

Try below in case you want to redirect to external UI :

String redirectUrl = `https://www.yahoo.com";
return "redirect:" + redirectUrl;

edited Jul 05 '20 at 17:02

answered Jul 05 '20 at 16:30

Amit kumar

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The UI of this Service, is external and hence, I am trying to redirect to UI URL but it's not happening – Angellic Doll Jul 05 '20 at 16:44
Well, You should add a `return` statement after redirecting to make it work. – Amit kumar Jul 05 '20 at 16:53
Updated the answer for more clarification. – Amit kumar Jul 05 '20 at 17:03
Updated and regarding return statement, it just sets the reponse location to redirected url but doesn't redirect – Angellic Doll Jul 05 '20 at 17:16
return "redirect:" + url; is printing "redirect:" in UI not redirecting – Angellic Doll Jul 05 '20 at 17:18
MVC configurations are autoconfigured using Spring Boot Autoconfiguration library, I want to know if that is causing the issue or is there any thing that needs to be override? – Angellic Doll Jul 05 '20 at 17:22

score 0 · Accepted Answer · answered Jul 06 '20 at 10:09

Issue resolved. This application has some custom libraries which uses Spring Security. Without access token, this error is occuring. I need to explore more of 401 error but for now, to handle errors am using class with @RestControllerAdvice and set property spring.mvc.throw-exception-if-no-handler-found to true and also, disable whitelabel.

Redirection logic works when the Authorization is successful.

Spring Customize whitelabel error - redirect

2 Answers2