refactor: move controller advice for validation errors up to common s…

…uper directory #46

ohsome-contributions-stats-service: 'Consider introducing 'Jakarta Bean validation' standard '
#46

src/main/kotlin/org/heigit/ohsome/now/statsservice/stats/ErrorHandling.kt → src/main/kotlin/org/heigit/ohsome/now/statsservice/ErrorHandling.kt

@@ -1,4 +1,4 @@
-package org.heigit.ohsome.now.statsservice.stats
+package org.heigit.ohsome.now.statsservice
 
 import jakarta.validation.ConstraintViolationException
 import org.springframework.http.HttpStatus.BAD_REQUEST
@@ -8,13 +8,11 @@ import org.springframework.web.bind.annotation.ResponseBody
 import org.springframework.web.bind.annotation.ResponseStatus
 
 
-// see https://reflectoring.io/bean-validation-with-spring-boot/#handling-validation-errors
-//class ValidationErrorResponse(val violations: List<Violation>)
+// inspired by https://reflectoring.io/bean-validation-with-spring-boot/#handling-validation-errors
+
+
+class Violation(val message: String, val invalidValue: String)
 
-class Violation(
-    val message: String,
-    val invalidValue: String
-)
 
 @ControllerAdvice
 internal class ErrorHandlingControllerAdvice {
@@ -25,7 +23,6 @@ internal class ErrorHandlingControllerAdvice {
     fun onConstraintValidationException(validationError: ConstraintViolationException) = validationError
         .constraintViolations
         .map { Violation(it.message, it.invalidValue.toString()) }
-//        .let { ValidationErrorResponse(it) }
 
 }