Method that might work

src/main/java/io/zipcoder/tc_spring_poll_application/exception/RestExceptionHandler.java

@@ -1,10 +1,15 @@
 package io.zipcoder.tc_spring_poll_application.exception;
 
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 import javax.servlet.http.HttpServletRequest;
 import dtos.error.ErrorDetail;
+import dtos.error.ValidationError;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
@@ -22,4 +27,32 @@ public class RestExceptionHandler {
         return new ResponseEntity<>(errorDetail, null, HttpStatus.NOT_FOUND);
     }
 
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<?> handleValidationError(MethodArgumentNotValidException manve, HttpServletRequest request) {
+        ErrorDetail errorDetail = new ErrorDetail();
+        // Populate errorDetail instance
+        errorDetail.setTimeStamp(new Date().getTime());
+        errorDetail.setStatus(HttpStatus.BAD_REQUEST.value());
+        String requestPath = (String) request.getAttribute("javax.servlet.error.request_uri");
+        if(requestPath == null) {
+            requestPath = request.getRequestURI();
+        }
+        errorDetail.setTitle("Validation Failed");
+        errorDetail.setDetail("Input validation failed");
+        errorDetail.setDeveloperMessage(manve.getClass().getName());
+        List<FieldError> fieldErrors =  manve.getBindingResult().getFieldErrors();
+        for(FieldError fe : fieldErrors) {
+            List<ValidationError> validationErrorList = errorDetail.getErrors().get(fe.getField());
+            if(validationErrorList == null) {
+                validationErrorList = new ArrayList<>();
+                errorDetail.getErrors().put(fe.getField(), validationErrorList);
+            }
+            ValidationError validationError = new ValidationError();
+            validationError.setCode(fe.getCode());
+            validationError.setMessage(fe.getDefaultMessage());
+            validationErrorList.add(validationError);
+        }
+        return new ResponseEntity<>(errorDetail, null, HttpStatus. BAD_REQUEST);
+    }
+
 }