refactor : 에러 관리

src/main/java/com/example/demo/base/ApiResponse.java

@@ -34,4 +34,5 @@ public static <T> ApiResponse<T> of(BaseCode code, T result) {
     public static <T> ApiResponse<T> onFailure(String code, String message, T data) {
         return new ApiResponse<>(false, code, message, data);
     }
+
 }

src/main/java/com/example/demo/base/code/status/exception/ErrorStatus.java

@@ -15,6 +15,7 @@ public enum ErrorStatus implements BaseErrorCode {
     BAD_REQUEST(HttpStatus.BAD_REQUEST, "COMMON400", "잘못된 요청입니다."),
     UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "COMMON401", "인증이 필요합니다."),
     FORBIDDEN(HttpStatus.FORBIDDEN, "COMMON403", "접근이 금지되었습니다."),
+    INVALID_ID_TYPE(HttpStatus.BAD_REQUEST, "COMMON400", "적합하지 않은 ID 타입입니다"),
 
     // s3 관련 에러
     FILE_UPLOAD_FAILED(HttpStatus.INTERNAL_SERVER_ERROR, "FILE4001", "파일 업로드 실패"),

src/main/java/com/example/demo/base/code/status/exception/ExceptionAdvice.java

@@ -8,6 +8,7 @@
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
@@ -95,4 +96,17 @@ private ResponseEntity<ApiResponse<Object>> buildErrorResponse(ErrorReasonDTO er
         ApiResponse<Object> body = ApiResponse.onFailure(errorReason.getCode(), errorReason.getMessage(), null);
         return ResponseEntity.status(errorReason.getHttpStatus()).body(body);
     }
+
+    @ExceptionHandler(HttpMessageNotReadableException.class)
+    public ResponseEntity<ApiResponse<?>> handleHttpMessageNotReadable(
+        HttpMessageNotReadableException ex) {
+        String errorMessage = "유효하지 않은 요청 형식입니다. ID는 숫자만 입력해야 합니다.";
+
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+            .body(ApiResponse.onFailure(
+                "COMMON400",
+                errorMessage,
+                null
+            ));
+    }
 }

src/main/java/com/example/demo/domain/dto/answer/AnswerRequestDto.java

@@ -1,15 +1,20 @@
 package com.example.demo.domain.dto.answer;
 
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
 import lombok.Getter;
 
 @Getter
 public class AnswerRequestDto {
 
 	@NotNull
+	@Min(value = 0, message = "적합하지 않은 ID 타입입니다.")
 	private Long questionId;
 
 	@NotNull
+	@Pattern(regexp = "^[^0-9]+$", message = "답변은 문자만 입력 가능합니다.")
 	private String answer;
 
 	public AnswerRequestDto(Long questionId, String answer) {