[JAVA] [Spring Boot] What to do if an HttpMediaTypeNotAcceptableException occurs on an endpoint for which produces is set

Cause

The cause was that I tried to return JSON even though produces =" text / csv " was set.

Status

The situation is as follows.

What I wanted to achieve

--Return csv (set produces =" text / csv ") Set endpoint --At the time of aggregation error, the status is 400, and the error content is packed in JSON and returned.

Actually, the following annotations were added.

@PostMapping(value = "[end point]", produces = "text/csv")

What happened

--Status becomes 406 on error --The error content is also empty --On the server side, HttpMediaTypeNotAcceptableException occurs

Countermeasures

It was OK if the specification of produces was removed.

@PostMapping(value = "[end point]")

If you do not specify produces, it will be treated as good, so if there is no problem, you do not have to specify it It seems.

Supplement

If you need to specify it dynamically and explicitly, you can write the response directly using HttpServletResponse. In that case, you can write as follows.

@PostMapping(value = "/api/csv")
public void csv(HttpServletResponse response) {
    String csv = //CSV acquisition process;

    response.setHeader(
            "Content-Disposition",
            "attachment;filename=\"" + /*file name*/ + "\""
    );
    response.setCharacterEncoding("Shift-JIS");
    response.setContentType("text/csv");

    try (Writer writer = response.getWriter()) {
        writer.write(csv);
    } catch (IOException e) {
        //Error handling
    }
}

Impressions

Error handling was standardized using ╩╗ExceptionHandler, but it took a long time to identify the cause without thinking that the producesset in the controller would penetrate that far. It was written asHttpMediaTypeNotAcceptableException` ...

Articles that I used as a reference

-What happens if you specify produces of @RequestMapping -tokuhirom's blog -To write Response data directly in Spring -Qiita

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