feature: 예외 클래스 및 예외 코드 세팅 (#33)

* feature: 예외 핸들러 추가

* feature: 예외 처리 추가

* style: spotless apply

src/main/java/com/goldbalance/dive/domain/member/service/MemberService.java

@@ -3,6 +3,8 @@
 import com.goldbalance.dive.domain.member.domain.Member;
 import com.goldbalance.dive.domain.member.dto.request.MemberSignin;
 import com.goldbalance.dive.domain.member.repository.MemberRepository;
+import com.goldbalance.dive.global.exception.CustomException;
+import com.goldbalance.dive.global.exception.ErrorCode;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -20,7 +22,7 @@ public class MemberService {
     public void signin(MemberSignin request) {
         boolean isDuplicate = memberRepository.existsByNickname(request.nickname());
         if (isDuplicate) {
-            throw new IllegalArgumentException();
+            throw new CustomException(ErrorCode.MEMBER_NICKNAME_DUPLICATE);
         }
 
         Member member = Member.create(request.nickname());

src/main/java/com/goldbalance/dive/global/exception/CustomException.java

@@ -0,0 +1,19 @@
+package com.goldbalance.dive.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;
+    }
+
+    public CustomException(ErrorCode errorCode, String errorMessage) {
+        super(errorMessage);
+        this.errorCode = errorCode;
+    }
+}

src/main/java/com/goldbalance/dive/global/exception/ErrorCode.java

@@ -0,0 +1,17 @@
+package com.goldbalance.dive.global.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@AllArgsConstructor
+public enum ErrorCode {
+    INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "서버 에러입니다."),
+
+    // Member
+    MEMBER_NICKNAME_DUPLICATE(HttpStatus.BAD_REQUEST, "이미 존재하는 닉네임입니다.");
+
+    private final HttpStatus status;
+    private final String message;
+}

src/main/java/com/goldbalance/dive/global/exception/ErrorResponse.java

@@ -0,0 +1,8 @@
+package com.goldbalance.dive.global.exception;
+
+public record ErrorResponse(String errorCodeName, String errorMessage) {
+
+    public static ErrorResponse of(ErrorCode errorCode) {
+        return new ErrorResponse(errorCode.name(), errorCode.getMessage());
+    }
+}

src/main/java/com/goldbalance/dive/global/exception/GlobalExceptionHandler.java

@@ -0,0 +1,26 @@
+package com.goldbalance.dive.global.exception;
+
+import static com.goldbalance.dive.global.exception.ErrorCode.*;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+@Slf4j
+@RestControllerAdvice
+public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @ExceptionHandler(CustomException.class)
+    public ResponseEntity<ErrorResponse> handleCustomException(CustomException e) {
+        log.error("CustomException : {}", e.getMessage(), e);
+        return ResponseEntity.status(e.getErrorCode().getStatus()).body(ErrorResponse.of(e.getErrorCode()));
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ErrorResponse> handleException(Exception e) {
+        log.error("INTERNAL_SERVER_ERROR : {}", e.getMessage(), e);
+        return ResponseEntity.status(INTERNAL_SERVER_ERROR.getStatus()).body(ErrorResponse.of(INTERNAL_SERVER_ERROR));
+    }
+}