spring boot custom validation message not shown - spring

Question

I have an endpoint that accepts query parameters bound to a class GetParams:
public class GetParams{
#Min(value = 0, message = "OFFSET_INVALID")
private Integer offset;
#Min(value = 0, message = "LIMIT_INVALID")
private int limit;
public GetParams() {
this.offset = 0;
this.limit = 100;
}
public int getOffset() {
return offset;
}
public int getLimit() {
return limit;
}
public void setOffset(int offset) {
this.offset = offset;
}
public void setLimit(int limit) {
this.limit = limit;
}
}
This is the endpoint in my controller:
#GetMapping(value = "/applications")
public ResponseEntity<Data> getApplications( #Validated GetParams parameters) { ... }
When I send a GET request that violates one of the constraints, for example:
GET /applications?offset=-20&limit=100
The framework returns a 400, but without my messages, and in fact without a response body and without a stack trace printed into the console! When the query params are valid, the result is valid as well. Why is this?
Thanks.

Answer 1

For a GET request you can't validate the request-params binding with object like you did above. You have to validate each param by themselves separately like this:
public ResponseEntity<Data> getApplications(#RequestParam #Min(1) #Max(value=7, message="you custom message") Integer offset, #RequestParam #Min(3) Integer params2, ... )
{
//your code/logic
}
You can validate that way only for POST and other requests with #RequestBody which have body in their requests.

Answer 2

From root path you can set 'include binding errors' in "resources/application.properties" to "always". Same goes for 'message' as well.
server.error.include-message=always
server.error.include-binding-errors=always

Answer 3

Request parameters are to mapped using #RequestParam.
Try
#GetMapping(value = "/applications")
public ResponseEntity<Data> getApplications( #Validated #ReqeustParam #Min(value = 0, message = "OFFSET_INVALID") Integer offset) { ... }`