Update GlobalExceptionHandler.java

build.gradle

@@ -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'

src/main/java/com/example/week2/builder/App1.java

@@ -1,8 +1,14 @@
 package com.example.week2.builder;
 
-public class App1 {
+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) {
-
+    log.error("에러입니다.");
+    throw new CustomException(ErrorCode.INVALID_REQUEST);
   }
 }

src/main/java/com/example/week2/exception/CustomException.java

@@ -8,7 +8,7 @@ public class CustomException extends RuntimeException{
   private final ErrorCode errorCode;
 
   public CustomException(ErrorCode errorCode) {
-    super(errorCode.getMessage());
+    super(errorCode.getMessage()); // RuntimeException은 string을 받아 단순 출력 -> 커스텀 errorCode를 전달
     this.errorCode = errorCode;
   }
 }

src/main/java/com/example/week2/exception/ErrorCode.java

@@ -8,7 +8,8 @@
 @AllArgsConstructor
 public enum ErrorCode {
 
-  INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청이 들어왔습니다"),;
+  INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청이 들어왔습니다"),
+  SEJONG_UNIV(HttpStatus.BAD_GATEWAY, "출력하고 싶은 메시지");
 
 
   private final HttpStatus status;

src/main/java/com/example/week2/exception/ExceptionController.java

@@ -21,4 +21,6 @@ public void throwIllegalArgumentException() {
     throw new IllegalArgumentException();
   }
 
+  @GetMapping("/custom")
+  public void throwCustomException() {throw new CustomException(ErrorCode.INVALID_REQUEST);}
 }

src/main/java/com/example/week2/exception/GlobalExceptionHandler.java

@@ -1,6 +1,7 @@
 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;
 
@@ -19,4 +20,17 @@ public String handleInternalError() {
     log.error("InternalError 처리 시작");
     return "InternalError 핸들링";
   }
+
+  @ExceptionHandler(CustomException.class)
+  public ResponseEntity<ErrorResponse> handleCustomException(CustomException e) {
+    log.error("CustomException 발생: {}", e.getMessage(), e);
+
+    ErrorCode errorCode = e.getErrorCode();
+
+    ErrorResponse response = ErrorResponse.builder()
+            .errorCode(errorCode)
+            .errorMessage(errorCode.getMessage())
+            .build();
+    return ResponseEntity.status(errorCode.getStatus()).body(response);
+  }
 }

src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java

@@ -4,11 +4,11 @@
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
-@ControllerAdvice
+@ControllerAdvice //-> 에러를 잡아서 View를 반환
 @Slf4j
 public class GlobalExceptionHandler2 {
 
-  @ExceptionHandler(IllegalArgumentException.class)
+  @ExceptionHandler(IllegalArgumentException.class) // -> IllegalArgumentException이 발생하면 얘가 잡아서 처리
   public String handleIllegalArgumentException() {
     log.error("IllegalArgumentException 발생");
     return "error";