Validation for Contract for API

If i have a rest controller in spring boot how can I validate the contract that comes in if certain values of the parameters need to have certain values??? ANy code examples are appreciated!
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Assuming that you have something like this:

@RequestMapping(value = "/contract", method = RequestMethod.POST, consumes = "application/json")
public void validateContract(@RequestBody final Contract contract) throws Exception {
   if (contract.getAmount() < 0) {
      throw new Exception("Wrong amount");

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