how to configure 500 error page with Spring boot 2.5.2, the default set up not working - spring

Question

I am relying on spring boot to handle the 500 (Internal server error). Followed various links which mentioned that I could customize my web app using the below properties
server.error.path=/error
server.error.whitelabel.enabled=false
I also wrote my custom error page controller as:
#Controller
public class GlobalErrorController implements ErrorController {
private final Logger log = LoggerFactory.getLogger(this.getClass());
#RequestMapping("/error")
public String handleError(HttpServletRequest request) {
Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
log.error("Error occurred!");
if (status != null) {
Integer statusCode = Integer.valueOf(status.toString());
// handle all the 400 error codes
if (statusCode != null && statusCode % 400 < 100) {
return "error/4xx";
} else if (statusCode == HttpStatus.INTERNAL_SERVER_ERROR.value()) {
return "error/500";
}
}
return "error/genericError";
}
}
This controller is never being called and I only see the server error page with console errors as below:
I can see see the error is clearly being thrown with /error page in console. Below is part of the error log:
2021-07-27 16:13:28.769 ERROR 22040 --- [nio-8080-exec-1]
o.a.c.c.C.[.[localhost] 175 : Exception Processing
ErrorPage[errorCode=0, location=/error]
One thing to note here is that the exception is being thrown in the filter, because I was testing the behavior of the app when one of the service goes down. But I should have still gotten the page I was expecting with /error controller.
Update:
I did some further research and found that an exception thrown in filters would not be handled by global exception handler. In order to handle the exceptions by spring's exception handler I added this filter which catches the exceptions raised by any other filters. The code is below:
#Component
public class ExceptionHandlerFilter extends OncePerRequestFilter {
private final Logger log = LoggerFactory.getLogger(getClass());
#Autowired
#Qualifier("handlerExceptionResolver")
private HandlerExceptionResolver resolver;
#Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
try {
filterChain.doFilter(request, response);
} catch (RuntimeException ex) {
log.error("Spring Security Filter Chain Exception:", ex);
resolver.resolveException(request, response, null, ex);
}
}
}
I also created a exception handler just for this as below:
#ControllerAdvice
public class GlobalExceptionHandler {
private final Logger log = LoggerFactory.getLogger(this.getClass());
#ExceptionHandler(RuntimeException.class)
public ModelAndView handleError(HttpServletRequest req, RuntimeException ex)
{
log.error("Request: " + req.getRequestURL() + " raised " + ex);
ModelAndView mav = new ModelAndView("error/500");
mav.addObject("exception", ex);
mav.addObject("url", req.getRequestURL());
return mav;
}
}
Now the issue is that it just shows the blank page without any content. I was expecting to see my custom error page located at error/500.

Answer 1

This code works fine for me. Could you change your class to below code and tell the result?
error_404 and error_500 is custom html error pages.
#Controller
public class MyErrorController implements ErrorController {
#RequestMapping("/error")
public String handleError(HttpServletRequest request) {
Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
if (status != null) {
int statusCode = Integer.parseInt(status.toString());
switch (statusCode) {
case 404:
return "error_404";
case 500:
return "error_500";
}
}
return "error";
}
#Override
public String getErrorPath() {
return null;
}
}
server.error.whitelabel.enabled=false
spring.mvc.throw-exception-if-no-handler-found=true
server.error.path=/error