Feat : 적절한 예외를 반환하도록 변경

Author: tlswltjq

back/src/main/java/com/back/domain/news/comment/service/CommentService.java

@@ -5,11 +5,12 @@
 import com.back.domain.news.comment.repository.CommentRepository;
 import com.back.domain.news.news.entity.News;
 import lombok.RequiredArgsConstructor;
+import org.springframework.security.access.AccessDeniedException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
-import java.util.Optional;
+import java.util.NoSuchElementException;
 
 @Service
 @RequiredArgsConstructor
@@ -26,14 +27,16 @@ public List<Comment> getComments(News news) {
         return commentRepository.findByNews(news);
     }
 
-    public Optional<Comment> getCommentById(Long commentId) {
-        return commentRepository.findById(commentId);
+    public Comment getCommentById(Long commentId) {
+        return commentRepository.findById(commentId)
+                .orElseThrow(() -> new NoSuchElementException("Comment not found: " + commentId));
     }
 
     public Comment updateComment(Member member, News news, Long commentId, String content) {
-        Comment comment = getCommentById(commentId).orElseThrow(() -> new IllegalArgumentException("Comment not found"));
+        Comment comment = getCommentById(commentId);
+
         if (!comment.getMember().equals(member)) {
-            throw new IllegalArgumentException("You do not have permission to update this comment.");
+            throw new AccessDeniedException("You do not have permission to update this comment.");
         }
         if (!comment.getNews().equals(news)) {
             throw new IllegalArgumentException("This comment does not belong to the given news.");
@@ -43,9 +46,10 @@ public Comment updateComment(Member member, News news, Long commentId, String co
     }
 
     public void deleteComment(Member member, News news, Long commentId) {
-        Comment comment = getCommentById(commentId).orElseThrow(() -> new IllegalArgumentException("Comment not found"));
+        Comment comment = getCommentById(commentId);
+
         if (!comment.getMember().equals(member)) {
-            throw new IllegalArgumentException("You do not have permission to delete this comment.");
+            throw new AccessDeniedException("You do not have permission to delete this comment.");
         }
         if (!comment.getNews().equals(news)) {
             throw new IllegalArgumentException("This comment does not belong to the given news.");