feat: Added GlobalExceptionHandler

- handles IllegalStateException, JpaSystemException and Exceptions

src/main/java/com/f_lab/la_planete/controller/GlobalExceptionHandler.java

@@ -0,0 +1,68 @@
+package com.f_lab.la_planete.controller;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import io.swagger.v3.oas.annotations.Hidden;
+import jakarta.persistence.PessimisticLockException;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+import org.hibernate.exception.LockTimeoutException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.orm.jpa.JpaSystemException;
+import org.springframework.transaction.TransactionSystemException;
+import org.springframework.web.ErrorResponse;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@Slf4j
+@Hidden
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+  @ExceptionHandler(IllegalStateException.class)
+  public ResponseEntity<ErrorResponse> handleIllegalStateException(IllegalStateException e) {
+    return ResponseEntity
+        .status(HttpStatus.CONFLICT)
+        .body(ErrorResponse.of(e.getMessage(), HttpStatus.CONFLICT.value()));
+  }
+
+  /**
+   * 데이터베이스 관련 예외 (e.g. 주로 락을 얻는 대기시간이 오래되어서 요청을 반환할 때)
+   */
+  @ExceptionHandler(JpaSystemException.class)
+  public ResponseEntity<ErrorResponse> handleJpaSystemException(JpaSystemException e) {
+    log.error("JpaSystemException occurred", e);
+    return ResponseEntity
+        .status(HttpStatus.SERVICE_UNAVAILABLE)
+        .body(ErrorResponse.of(
+            "현재 너무 많은 요청을 처리하고 있습니다. 다시 시도해주세요",
+            HttpStatus.SERVICE_UNAVAILABLE.value()));
+  }
+
+  /**
+   * 어플리케이션에서 처리하지 못한 다른 모든 예외
+   */
+  @ExceptionHandler(Exception.class)
+  public ResponseEntity<ErrorResponse> handleGenericException(Exception e) {
+    log.error("Unexpected Error occurred. Requires Potential Handling", e);
+    return ResponseEntity
+        .status(HttpStatus.INTERNAL_SERVER_ERROR)
+        .body(ErrorResponse.of(
+            "알 수 없는 오류가 발생했습니다. 다시 시도해주세요",
+            HttpStatus.INTERNAL_SERVER_ERROR.value()));
+  }
+
+  @Getter
+  @AllArgsConstructor
+  static class ErrorResponse {
+    private String message;
+
+    @JsonProperty("status_code")
+    private int statusCode;
+
+    public static ErrorResponse of(String message, int statusCode) {
+      return new ErrorResponse(message, statusCode);
+    }
+  }
+}

src/main/java/com/f_lab/la_planete/service/OrderService.java

@@ -52,12 +52,7 @@ public OrderCreateResponseDTO createFoodOrder(OrderCreateRequestDTO request) {
   }
 
   private Food findFoodWithLock(Long foodId) {
-    try {
-     return  foodRepository.findFoodByFoodIdWithPessimisticLock(foodId);
-    } catch(PessimisticLockException | PessimisticLockingFailureException e) {
-      log.warn("Pessimistic lock failure on food ID: {}", foodId, e);
-      throw new IllegalStateException("오류 다시 시도해 주시길 바랍니다.");
-    }
+     return foodRepository.findFoodByFoodIdWithPessimisticLock(foodId);
   }
 }