feat: slack notifier when okky doesn't parsed

SouP/build.gradle

@@ -50,6 +50,7 @@ dependencies {
 		exclude group: "org.hamcrest", module: "hamcrest-core"
 	}
 	implementation 'org.hibernate.validator:hibernate-validator:6.0.7.Final'
+	implementation 'com.squareup.okhttp3:okhttp:4.9.3'
 }
 
 def frontendDir = "$projectDir/../soup-frontend"

SouP/src/main/java/Matching/SouP/common/SlackNotifier.java

@@ -0,0 +1,35 @@
+package Matching.SouP.common;
+
+import Matching.SouP.service.PropertyUtil;
+import lombok.extern.slf4j.Slf4j;
+import okhttp3.*;
+
+
+@Slf4j
+public class SlackNotifier {
+    private static final OkHttpClient client = new OkHttpClient();
+
+    public void sendMessageToSlack() {
+        String webHookURL = PropertyUtil.getProperty("webhook.url");
+        String message = "OKKY 파싱 에러";
+
+        RequestBody body = RequestBody.create(
+            MediaType.parse("application/json; charset=utf-8"),
+            "{\"text\":\"" + message + "\"}"
+        );
+
+        Request request = new Request.Builder()
+            .url(webHookURL)
+            .post(body)
+            .build();
+
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful()) {
+                throw new RuntimeException("Unexpected code " + response);
+            }
+            log.warn("Message sent successfully: " + response.body().string());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

SouP/src/main/java/Matching/SouP/crawler/okky/OkkyService.java

@@ -1,5 +1,6 @@
 package Matching.SouP.crawler.okky;
 
+import Matching.SouP.common.SlackNotifier;
 import Matching.SouP.crawler.ConvertToPost;
 import Matching.SouP.crawler.CrawlerService;
 import Matching.SouP.crawler.Selenium;
@@ -101,7 +102,9 @@ private int startPage(WebDriver driver, int start) throws StringIndexOutOfBounds
          */
         int cnt = 2;
         while(true){
-            if (page > 5) {
+            if (page > 5 || cnt > 6) {
+                SlackNotifier slackNotifier = new SlackNotifier();
+                slackNotifier.sendMessageToSlack();
                 throw new IllegalStateException("오키 파싱 에러");
             }
             driver.get(urlOkky + "?page=" + page);
@@ -117,6 +120,8 @@ private int startPage(WebDriver driver, int start) throws StringIndexOutOfBounds
             }catch (StringIndexOutOfBoundsException | NullPointerException e){
                 cnt++;
                 log.info("StringIndexOutOfBoundsException");
+                SlackNotifier slackNotifier = new SlackNotifier();
+                slackNotifier.sendMessageToSlack();
                 continue;
             }
             if(num<start){