How to display error message into a Json using ResponseStatusException on Spring boot?

I have an issue displaying an error message at the moment that a bad request is triggered.

@DeleteMapping("/{projectId}/bugs/{bugId}")
public void deleteBug(@PathVariable (value = "projectId") Long projectId,
                      @PathVariable (value = "bugId") Long bugId){
    if (!projectService.existById(projectId) || !bugService.existById(bugId)) {
        throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "ProjectId " + projectId + " or BugId " + bugId + " not found");
    }
    bugService.deleteBug(bugId);
}

This is the JSON response when I trigger the Response:

{
"timestamp": "2020-05-29T15:40:41.302+00:00",
"status": 400,
"error": "Bad Request",
"message": "",
"path": "/projects/3/bugs/2"  }

As you can see the message is not appearing. If I change the HttpStatus in the code it actually works but for some reason, the message is not working.

I checked the constructor of the class and it actually allows only the status and the reason.

Am I missing something or is it a bug in the ResponseStatusException class?

I also encountered this. It's not a bug, so downgrading is not the best resolution. The Spring Boot 2.3.0 release notes explain:

> ### Changes to the Default Error Page's Content
> The error message and any binding errors are no longer included in the
> default error page by default. This reduces the risk of leaking
> information to a client. server.error.include-message and
> server.error.include-binding-errors can be used to control the
> inclusion of the message and binding errors respectively. Supported
> values are always, on-param, and never.

So for example, in your application configuration you can set these to show message but not trace output (YAML example):

server:
  error:
    include-message: ALWAYS
    include-stacktrace: NEVER