Optional in path param in REST api Spring MVC

Question

I have requirement to pass a Optional parameter (count) to GET method. I tried below.

@RequestMapping(value = {"/findDetail","/findDetail/{no}"}, method = RequestMethod.GET, produces = "application/json")
    @ResponseBody
     public int findAll(@PathVariable Optional<Integer>  no) {
        //find method takes Optional argument.
        return ticketService.find(no);
    }

I am expecting some value here but no always has null. Did I miss something here?

Community · Accepted Answer · 2017-05-23 11:52:47Z

0

I just tried this out, and it worked fine for me? no.get() gives 4 with a GET to /findDetail/4

I'm running with Spring MVC 4.2.6 (via Spring Boot 1.3.5) if that makes any difference?

Do you see a change if you do @PathVariable("no") Optional<Integer> no instead? (I can't see why you would, but worth a shot?)

But you definitely are on the right 'path' - what you said should work fine as pointed at in Optional path segments in Spring MVC amongst other answers.

edited May 23, 2017 at 11:52

CommunityBot

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answered May 24, 2016 at 8:35

Tristan Perry

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3 Comments

Jacob Over a year ago

I tried with same Spring version as yours. I have deployed it in tomcat. While running in debug mode to check the value, I am not at all the value

Tristan Perry Over a year ago

Hmm okay. Could you try changing the signature to public int findAll(@PathVariable Optional<Integer> no, HttpServletRequest request) { and seeing what Spring thinks the URL is in debug mode? (request.getRequestURL())

Jacob Over a year ago

Actually when I give multiple value in Request mapping, it doesnt work. The call even doesnt come to method. But when I give single value like value = "/findDetail/ or value = "/findDetail/{no}, it works as expected for that url.

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