Merge pull request #76 from woowacourse-teams/feature/#71

커스텀 예외 처리

backend/src/main/java/mouda/backend/exception/ErrorResponse.java

@@ -0,0 +1,6 @@
+package mouda.backend.exception;
+
+public record ErrorResponse(
+	String message
+) {
+}

backend/src/main/java/mouda/backend/exception/GlobalExceptionHandler.java

@@ -0,0 +1,21 @@
+package mouda.backend.exception;
+
+import org.springframework.http.HttpStatus;
+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;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
+
+	@ExceptionHandler(MoudaException.class)
+	public ResponseEntity<ErrorResponse> handleMoudaException(MoudaException exception) {
+		return ResponseEntity.status(exception.getHttpStatus()).body(new ErrorResponse(exception.getMessage()));
+	}
+
+	@ExceptionHandler(Exception.class)
+	public ResponseEntity<ErrorResponse> handleException() {
+		return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(new ErrorResponse("서버 오류가 발생했습니다."));
+	}
+}

backend/src/main/java/mouda/backend/exception/MoudaException.java

@@ -0,0 +1,14 @@
+package mouda.backend.exception;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class MoudaException extends RuntimeException {
+
+	private HttpStatus httpStatus;
+	private String message;
+}

backend/src/main/java/mouda/backend/moim/domain/Moim.java

@@ -3,6 +3,8 @@
 import java.time.LocalDate;
 import java.time.LocalTime;
 
+import org.springframework.http.HttpStatus;
+
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
@@ -11,6 +13,8 @@
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import mouda.backend.moim.exception.MoimErrorMessage;
+import mouda.backend.moim.exception.MoimException;
 
 @Entity
 @Getter
@@ -40,7 +44,7 @@ public class Moim {
 
 	public void join() {
 		if (currentPeople + 1 > maxPeople) {
-			throw new IllegalArgumentException();
+			throw new MoimException(HttpStatus.BAD_REQUEST, MoimErrorMessage.MAX_PEOPLE);
 		}
 		currentPeople++;
 	}

backend/src/main/java/mouda/backend/moim/exception/MoimErrorMessage.java

@@ -0,0 +1,15 @@
+package mouda.backend.moim.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum MoimErrorMessage {
+
+	NOT_FOUND("모임이 존재하지 않습니다."),
+	MAX_PEOPLE("모임 최대 인원 수를 초과합니다."),
+	;
+
+	private final String message;
+}

backend/src/main/java/mouda/backend/moim/exception/MoimException.java

@@ -0,0 +1,12 @@
+package mouda.backend.moim.exception;
+
+import org.springframework.http.HttpStatus;
+
+import mouda.backend.exception.MoudaException;
+
+public class MoimException extends MoudaException {
+
+	public MoimException(HttpStatus httpStatus, MoimErrorMessage moimErrorMessage) {
+		super(httpStatus, moimErrorMessage.getMessage());
+	}
+}

backend/src/main/java/mouda/backend/moim/service/MoimService.java

@@ -2,6 +2,7 @@
 
 import java.util.List;
 
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -12,6 +13,8 @@
 import mouda.backend.moim.dto.response.MoimDetailsFindResponse;
 import mouda.backend.moim.dto.response.MoimFindAllResponse;
 import mouda.backend.moim.dto.response.MoimFindAllResponses;
+import mouda.backend.moim.exception.MoimErrorMessage;
+import mouda.backend.moim.exception.MoimException;
 import mouda.backend.moim.repository.MoimRepository;
 
 @Transactional
@@ -38,20 +41,20 @@ public MoimFindAllResponses findAllMoim() {
 	@Transactional(readOnly = true)
 	public MoimDetailsFindResponse findMoimDetails(long id) {
 		Moim moim = moimRepository.findById(id)
-			.orElseThrow(IllegalArgumentException::new);
+			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
 
 		return MoimDetailsFindResponse.toResponse(moim);
 	}
 
 	public void joinMoim(MoimJoinRequest moimJoinRequest) {
 		Moim moim = moimRepository.findById(moimJoinRequest.moimId())
-			.orElseThrow(() -> new IllegalArgumentException("모임이 존재하지 않습니다."));
+			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
 		moim.join();
 	}
 
 	public void deleteMoim(long id) {
 		Moim moim = moimRepository.findById(id)
-			.orElseThrow(IllegalArgumentException::new);
+			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
 
 		moimRepository.delete(moim);
 	}