ControllerAdvice

src/main/java/org/sadtech/example/springvalidation/controller/ErrorHandlingControllerAdvice.java

@@ -0,0 +1,48 @@
+package org.sadtech.example.springvalidation.controller;
+
+import org.sadtech.example.springvalidation.dto.ValidationErrorResponse;
+import org.sadtech.example.springvalidation.dto.Violation;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+import javax.validation.ConstraintViolationException;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@ControllerAdvice
+public class ErrorHandlingControllerAdvice {
+
+    @ResponseBody
+    @ExceptionHandler(ConstraintViolationException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ValidationErrorResponse onConstraintValidationException(
+            ConstraintViolationException e
+    ) {
+        final List<Violation> violations = e.getConstraintViolations().stream()
+                .map(
+                        violation -> new Violation(
+                                violation.getPropertyPath().toString(),
+                                violation.getMessage()
+                        )
+                )
+                .collect(Collectors.toList());
+        return new ValidationErrorResponse(violations);
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    @ResponseBody
+    public ValidationErrorResponse onMethodArgumentNotValidException(
+            MethodArgumentNotValidException e
+    ) {
+        final List<Violation> violations = e.getBindingResult().getFieldErrors().stream()
+                .map(error -> new Violation(error.getField(), error.getDefaultMessage()))
+                .collect(Collectors.toList());
+        return new ValidationErrorResponse(violations);
+    }
+
+}

src/main/java/org/sadtech/example/springvalidation/dto/PersonDto.java

@@ -34,7 +34,10 @@ public class PersonDto {
     private int numberBetweenOneAndTen;
 
     @Column(name = "ip_address")
-    @Pattern(regexp = "^((25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])(\\.(?!$)|$)){4}$")
+    @Pattern(
+            regexp = "^((25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])(\\.(?!$)|$)){4}$",
+            message = "Не соответствует формату IP адреса"
+    )
     private String ipAddress;
 
 }

src/main/java/org/sadtech/example/springvalidation/dto/ValidationErrorResponse.java

@@ -0,0 +1,14 @@
+package org.sadtech.example.springvalidation.dto;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+import java.util.List;
+
+@Getter
+@RequiredArgsConstructor
+public class ValidationErrorResponse {
+
+    private final List<Violation> violations;
+
+}

src/main/java/org/sadtech/example/springvalidation/dto/Violation.java

@@ -0,0 +1,13 @@
+package org.sadtech.example.springvalidation.dto;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public class Violation {
+
+    private final String fieldName;
+    private final String message;
+
+}