How to validate Spring MVC @PathVariable values?

Question

For a simple RESTful JSON api implemented in Spring MVC, can I use Bean Validation (JSR-303) to validate the path variables passed into the handler method?

For examp

Answer 1

The solution is simple:

@GetMapping(value = {"/", "/{hash:[a-fA-F0-9]{40}}"})
public String request(@PathVariable(value = "hash", required = false) String historyHash)
{
    // Accepted requests: either "/" or "/{40 character long hash}"
}

And yes, PathVariables are ment to be validated, like any user input.