Fix: 에러 처리 추가

src/main/java/dongguk/osori/domain/portfolio/service/PortfolioService.java

@@ -7,6 +7,8 @@
 import dongguk.osori.domain.quest.service.QuestService;
 import dongguk.osori.domain.user.entity.User;
 import dongguk.osori.domain.user.repository.UserRepository;
+import dongguk.osori.global.exception.CustomException;
+import dongguk.osori.global.exception.ErrorCode;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -72,7 +74,7 @@ public List<PortfolioBaseDto> getPortfolioList(Long userId) {
     @Transactional(readOnly = true)
     public PortfolioDetailDto getPortfolioDetail(Long userId, Long portfolioId) {
         Portfolio portfolio = portfolioRepository.findPortfolioWithDetails(portfolioId, userId)
-                .orElseThrow(() -> new IllegalArgumentException("Portfolio not found or access denied for ID: " + portfolioId));
+                .orElseThrow(() -> new CustomException(ErrorCode.PORTFOLIO_NOT_FOUND));
 
         return mapToDetailDto(portfolio);
     }

src/main/java/dongguk/osori/global/exception/CustomException.java

@@ -0,0 +1,13 @@
+package dongguk.osori.global.exception;
+
+import lombok.Getter;
+
+@Getter
+public class CustomException extends RuntimeException {
+    private final ErrorCode errorCode;
+
+    public CustomException(ErrorCode errorCode) {
+        super(errorCode.getMessage());
+        this.errorCode = errorCode;
+    }
+}

src/main/java/dongguk/osori/global/exception/ErrorCode.java

@@ -0,0 +1,46 @@
+package dongguk.osori.global.exception;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum ErrorCode {
+    // global
+    INVALID_INPUT_VALUE(400, "잘못된 입력 값입니다."),
+    INTERNAL_SERVER_ERROR(500, "서버 오류가 발생했습니다."),
+    UNAUTHORIZED_ACCESS(401, "권한이 없습니다."),
+    INVALID_REQUEST(400, "잘못된 요청입니다."),
+    FORBIDDEN_ACCESS(403, "접근 권한이 없습니다."),
+    SESSION_EXPIRED(401, "세션이 만료되었습니다."),
+    INVALID_REQUEST_BODY(400, "요청 본문이 잘못되었습니다."),
+    MISSING_REQUIRED_FIELD(400, "필수 필드가 누락되었습니다."),
+    INVALID_DATA_FORMAT(400, "유효하지 않은 데이터 형식입니다."),
+    INVALID_FIELD_VALUE(422, "요청 본문의 데이터가 유효하지 않습니다."),
+    FIELD_VALIDATION_FAILED(422, "필드 값 검증에 실패했습니다."),
+    UNSUPPORTED_MEDIA_TYPE(415, "지원하지 않는 Content-Type입니다."),
+
+
+    // user
+    UNAUTHORIZED(403, "인증되지 않은 사용자입니다."),
+    USER_NOT_FOUND(404, "사용자를 찾을 수 없습니다."),
+    SESSION_USER_NOT_FOUND(401, "세션에 userId가 없습니다."),
+    COUPLE_ONLY_ACCESS(403, "커플인 경우에만 접근할 수 있습니다."),
+
+    // policy
+    POLICY_NOT_FOUND(404, "해당 정책을 찾을 수 없습니다."),
+    POLICY_ALREADY_EXISTS(409, "이미 존재하는 정책입니다."),
+
+
+    // comment
+    COMMENT_NOT_FOUND(404, "댓글을 찾을 수 없습니다."),
+    COMMENT_DELETE_FORBIDDEN(403, "댓글 삭제 권한이 없습니다."),
+
+    // portfolio
+    PORTFOLIO_NOT_FOUND(404, "포트폴리오를 찾을 수 없습니다."),
+    PORTFOLIO_ACCESS_FORBIDDEN(403, "해당 포트폴리오에 접근할 권한이 없습니다.");
+
+
+    private final int status;
+    private final String message;
+}

src/main/java/dongguk/osori/global/exception/ErrorResponse.java

@@ -0,0 +1,18 @@
+package dongguk.osori.global.exception;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class ErrorResponse {
+    private final int status;
+    private final String message;
+
+    public static ErrorResponse of(ErrorCode errorCode) {
+        return ErrorResponse.builder()
+                .status(errorCode.getStatus())
+                .message(errorCode.getMessage())
+                .build();
+    }
+}

src/main/java/dongguk/osori/global/exception/GlobalExceptionHandler.java

@@ -0,0 +1,23 @@
+package dongguk.osori.global.exception;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(CustomException.class)
+    public ResponseEntity<ErrorResponse> handleCustomException(CustomException ex) {
+        return ResponseEntity
+                .status(ex.getErrorCode().getStatus())
+                .body(ErrorResponse.of(ex.getErrorCode()));
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ErrorResponse> handleException(Exception ex) {
+        return ResponseEntity
+                .status(ErrorCode.INTERNAL_SERVER_ERROR.getStatus())
+                .body(ErrorResponse.of(ErrorCode.INTERNAL_SERVER_ERROR));
+    }
+}