How to validate long PathParam in Spring

Question

I would like to validate input of following @RequestMapping:

@RequestMapping(value = "/{id}", method = RequestMethod.GET)
@ResponseBody
public Response getCategory(@PathVariable("id") Long id) {
   // some logic here
}

When consumer of the endpoint passes string following error occurs:

Failed to convert value of type [java.lang.String] to required type [java.lang.Long]; nested exception is java.lang.NumberFormatException: For input string: "null"

I could change it to string but I believe there is a better way to do it.

The message says "null" is not a Long, try requesting "/1" or "/2", not "/null". — , Sep 14 '17 at 11:17
This is thing I want to prevent - users calling with `null` to my endpoint — pixel, Sep 14 '17 at 11:41
I think this post will help you https://stackoverflow.com/questions/5493767/can-pathvariable-return-null-if-its-not-found — CrazyJavaLearner, Sep 14 '17 at 12:20

score 3 · Accepted Answer · answered Sep 14 '17 at 13:19

3

The answer from RC is a very good way to make sure your id will be made of digits.

In general if you want to validate incoming requests you could also create and register a custom interceptor by implementing HandlerInterceptor and then add your validation in the overridden preHandle method.

answered Sep 14 '17 at 13:19

martidis

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link broken as of 2021-01-06 919am CST – ComplexityAverse Jan 06 '21 at 15:20

How to validate long PathParam in Spring

1 Answers1