diff --git a/build.gradle b/build.gradle
index d89f850..b2622ca 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ version = '0.0.1-SNAPSHOT'
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(23)
     }
 }
 
@@ -24,10 +24,10 @@ repositories {
 }
 
 dependencies {
-    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+//    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-web'
     compileOnly 'org.projectlombok:lombok'
-    runtimeOnly 'com.mysql:mysql-connector-j'
+//    runtimeOnly 'com.mysql:mysql-connector-j'
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
diff --git a/src/main/java/com/example/week2/builder/App1.java b/src/main/java/com/example/week2/builder/App1.java
index b5f9553..a2d7b5a 100644
--- a/src/main/java/com/example/week2/builder/App1.java
+++ b/src/main/java/com/example/week2/builder/App1.java
@@ -1,8 +1,23 @@
 package com.example.week2.builder;
 
+import com.example.week2.exception.CustomException;
+import com.example.week2.exception.ErrorCode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class App1 {
 
+  private static final Logger log = LoggerFactory.getLogger(App1.class);
+
   public static void main(String[] args) {
 
+    Student.StudentBuilder school = Student.builder()
+            .name("heeun")
+            .age(28)
+            .school("sejong");
+
+    Student st = school.build();
+
+
   }
 }
diff --git a/src/main/java/com/example/week2/builder/Student.java b/src/main/java/com/example/week2/builder/Student.java
index dabec74..3a4608b 100644
--- a/src/main/java/com/example/week2/builder/Student.java
+++ b/src/main/java/com/example/week2/builder/Student.java
@@ -6,15 +6,25 @@
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 @Getter
 @Setter
 @AllArgsConstructor
 @NoArgsConstructor
-@Builder
 @ToString
 public class Student {
+
+  private Long id;
   private String name;
   private int age;
   private String school;
+
+  @Builder
+  public Student(String name, int age, String school) {
+    this.name = name;
+    this.age = age;
+    this.school = school;
+  }
 }
diff --git a/src/main/java/com/example/week2/exception/CustomException.java b/src/main/java/com/example/week2/exception/CustomException.java
index 49fb605..6e27238 100644
--- a/src/main/java/com/example/week2/exception/CustomException.java
+++ b/src/main/java/com/example/week2/exception/CustomException.java
@@ -3,7 +3,7 @@
 import lombok.Getter;
 
 @Getter
-public class CustomException extends RuntimeException{
+public class CustomException extends RuntimeException{ // 런타임 상속
 
   private final ErrorCode errorCode;
 
diff --git a/src/main/java/com/example/week2/exception/ErrorCode.java b/src/main/java/com/example/week2/exception/ErrorCode.java
index 4d28422..df7faef 100644
--- a/src/main/java/com/example/week2/exception/ErrorCode.java
+++ b/src/main/java/com/example/week2/exception/ErrorCode.java
@@ -6,9 +6,10 @@
 
 @Getter
 @AllArgsConstructor
-public enum ErrorCode {
+public enum ErrorCode { // 직접 커스텀
 
   INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청이 들어왔습니다"),;
+  
 
 
   private final HttpStatus status;
diff --git a/src/main/java/com/example/week2/exception/ExceptionController.java b/src/main/java/com/example/week2/exception/ExceptionController.java
index 859ce8e..65c025d 100644
--- a/src/main/java/com/example/week2/exception/ExceptionController.java
+++ b/src/main/java/com/example/week2/exception/ExceptionController.java
@@ -21,4 +21,11 @@ public void throwIllegalArgumentException() {
     throw new IllegalArgumentException();
   }
 
+  @GetMapping("/custom")
+  public void customeException() {
+    throw new CustomException(ErrorCode.INVALID_REQUEST);
+  }
+
+
+
 }
diff --git a/src/main/java/com/example/week2/exception/GlobalExceptionHandler.java b/src/main/java/com/example/week2/exception/GlobalExceptionHandler.java
index 91a694e..f56f610 100644
--- a/src/main/java/com/example/week2/exception/GlobalExceptionHandler.java
+++ b/src/main/java/com/example/week2/exception/GlobalExceptionHandler.java
@@ -1,9 +1,11 @@
 package com.example.week2.exception;
 
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
+//컨트롤러를 보고있는 상태유지?
 @RestControllerAdvice
 @Slf4j
 public class GlobalExceptionHandler {
@@ -19,4 +21,23 @@ public String handleInternalError() {
     log.error("InternalError 처리 시작");
     return "InternalError 핸들링";
   }
+
+
+  @ExceptionHandler(CustomException.class)
+  public ResponseEntity<ErrorResponse> handleCustomeException(CustomException e) {
+    log.info("customError 처리 시작 {}", e.getMessage(), e);
+
+    ErrorCode errorCode = e.getErrorCode();
+    ErrorResponse response = ErrorResponse.builder()
+            .errorCode(errorCode)
+            .errorMessage(errorCode.getMessage())
+            .build();
+    return ResponseEntity.status(errorCode.getStatus()).body(response);
+  }
+
+
+
+
+
+
 }
diff --git a/src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java b/src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java
index 3173af8..9680378 100644
--- a/src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java
+++ b/src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java
@@ -4,6 +4,7 @@
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
+//
 @ControllerAdvice
 @Slf4j
 public class GlobalExceptionHandler2 {
@@ -11,7 +12,7 @@ public class GlobalExceptionHandler2 {
   @ExceptionHandler(IllegalArgumentException.class)
   public String handleIllegalArgumentException() {
     log.error("IllegalArgumentException 발생");
-    return "error";
+    return "error";//error 라는 뷰를 찾는다. @ControllerAdvice 이기대문에
   }
 
 }
diff --git a/src/main/java/com/example/week2/logger/LoggerExample3.java b/src/main/java/com/example/week2/logger/LoggerExample3.java
index 0a8cfce..47db2df 100644
--- a/src/main/java/com/example/week2/logger/LoggerExample3.java
+++ b/src/main/java/com/example/week2/logger/LoggerExample3.java
@@ -14,6 +14,7 @@ public static void main(String[] args) {
         .build();
 
     log.info("학생 이름은" + student.getName() + "입니다");
+    // logging level 을 error 을 해도 계산을 진행한다.
 
     log.info("학생 이름은 {} 입니다.", student.getName());
   }