Spring Rest Service @RequestParam required = true only if another @RequestParam is present

I have the following code:

@RequestMapping(value = "/test", method = RequestMethod.POST)
public void test(@RequestParam(required= false) String fromDate,
                 @RequestParam(required= false) String toDate) {
}

The "rules" are:

• if fromDate and toDate are empty --> OK
• if fromDate has a value and toDate is empty --> OK
• if fromDate and toDate have value --> OK
• if fromDate is empty and toDate has a value --> NOT OK

It is possible to do that with custom Spring validations?

Something like...

@RequestParam(required = false)
@ValidateDependingOnAnotherField(field = "fromDate") String toDate

Thanks!