Refactor : ChatRoom 직렬화 코드 추가

- JPA 의존성 추가
- ChatRoom 직렬화 추가

build.gradle

@@ -51,6 +51,9 @@ dependencies {
     implementation 'mysql:mysql-connector-java:8.0.32'
     runtimeOnly 'com.mysql:mysql-connector-j'
 
+    //jpa
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
 
     implementation 'org.webjars.bower:bootstrap:4.3.1'
     implementation 'org.webjars.bower:vue:2.5.16'

src/main/java/com/catchroom/chat/chatroom/entity/ChatRoom.java

@@ -1,19 +1,23 @@
 package com.catchroom.chat.chatroom.entity;
 
-import jakarta.persistence.*;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
+import java.io.Serializable;
 import java.util.UUID;
 
 @Entity
 @Getter
 @AllArgsConstructor
 @NoArgsConstructor
 @Builder
-public class ChatRoom {
+public class ChatRoom implements Serializable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)