Postprocess @RequestBody obtained from Jackson in Spring controllers, before @Valid checks kick in

Question

(I'm using Spring 4.0.x)

Lets say I've got the following controller method defined:

@RequestMapping(value = "/endpoint", method = RequestMethod.POST)
public ResponseObject postNewRequest(@Valid @RequestBody RequestObject request) {
    return randomService.processRequest(request);
}

RequestObject is basically a JSON payload, which Jacksons ObjectMapper maps to given DTO.

What is the cleanest approach for me modify object which Jackson serializes, before validation kicks in and before it gets passed down to the service?

Example use case: I want to be nice and if user provides me with a value which I can safely trim, I want to do this here, instead of worrying about this in the service?

Bonus question: is it possible for this to be specified per RequestObject class, not per controller method?

Thank you very much for any help in here and spending time reading this question.

see http://stackoverflow.com/questions/6852213/can-jackson-be-configured-to-trim-leading-trailing-whitespace-from-all-string-pr — Neil McGuigan, Nov 27 '14 at 21:52
@NeilMcGuigan awesome, until I will find a proper solution, this one looks like a viable approach. Thanks! — zeroDivisible, Nov 27 '14 at 21:58

score 0 · Answer 1 · answered Nov 27 '14 at 21:33

0

Propably you need to use HandlerInterceptor

Or, if you want to make it per RequestObject class, try to use aspects.

answered Nov 27 '14 at 21:33

retroq

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Postprocess @RequestBody obtained from Jackson in Spring controllers, before @Valid checks kick in

1 Answers1