refactor: findByEmail 중복코드 제거

server/src/main/java/com/ticketing/server/user/service/UserServiceImpl.java

@@ -39,13 +39,7 @@ public class UserServiceImpl implements UserService {
 	@Override
 	@Transactional
 	public User delete(@Valid DeleteUserDTO deleteUserDto) {
-		User user = userRepository.findByEmail(deleteUserDto.getEmail())
-			.orElseThrow(() -> {
-					log.error("존재하지 않는 이메일 입니다. :: {}", deleteUserDto.getEmail());
-					throw new EmailNotFoundException();
-				}
-			);
-
+		User user = findByEmail(deleteUserDto.getEmail());
 		return user.delete(deleteUserDto);
 	}
 
@@ -59,7 +53,11 @@ public class UserServiceImpl implements UserService {
 	@Override
 	public User findByEmail(String email) {
 		return userRepository.findByEmail(email)
-			.orElseThrow(EmailNotFoundException::new);
+			.orElseThrow(() -> {
+					log.error("존재하지 않는 이메일 입니다. :: {}", email);
+					throw new EmailNotFoundException();
+				}
+			);
 	}
 
 	private User findNotDeletedUserByEmail(String email) {