issue # GlobalExceptionHandler 파일 수정

src/main/java/com/baekyangdan/scheduler/config/GlobalExceptionHandler.java

@@ -5,11 +5,15 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
-import java.time.LocalDateTime;
+import com.baekyangdan.scheduler.exception.AuthException;
+import com.baekyangdan.scheduler.exception.BusinessException;
+import com.baekyangdan.scheduler.exception.ValidationException;
+
 import java.util.HashMap;
 import java.util.Map;
 
-public class ExceptionHandler {
+@RestControllerAdvice
+public class GlobalExceptionHandler {
     // 에러 핸들러 목록
     // 1. 비즈니스 로직 관련 예외 처리
     // ex) 중복 데이터
@@ -32,7 +36,7 @@ public class ExceptionHandler {
     // 3. 권한/인가 관련 예외 처리
     // ex) 로그인이 필요한 서비스에 로그인 안 한 사람이 호출
     @ExceptionHandler(AuthException.class)
-    public ResponseEntity<Map<String, Object>> handleValidationException(ValidationException e) {
+    public ResponseEntity<Map<String, Object>> handleAuthException(ValidationException e) {
         Map<String, Object> body = new HashMap<>();
         body.put("message", e.getMessage());
         return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(body);

src/main/java/com/baekyangdan/scheduler/utils/generator/RandomCodeGenerator.java

@@ -11,7 +11,7 @@ public class RandomCodeGenerator {
     private static final SecureRandom random = new SecureRandom();
 
     public static String generateRandomCode(int length) {
-        List<Character> codeCharacters = ArrayList<>(length);
+        List<Character> codeCharacters = new ArrayList<>(length);
 
         for (int i = 0; i < length; i++) {
             codeCharacters.add(randomChar());