sort=,DESC (not specified property of sort target)
Current implementation of the PageableHandlerMethodArgumentResolver is occurred IllegalArgumentException, and http response status is returned 500(Internal Server Error) on the default settings of SpringMVC.
I think a best that http response status is returned 400(Bad Request).
I fixed this by gracefully falling back to the defaults (in case of invalid page number and size) or ignoring invalid values (for sort properties). I think this makes more sense rather than telling the client that it was wrong and it has to repeat the request, which it would then do using the defaults anyway