[FEAT] global controller advice and dto

backend/src/main/java/com/twtw/backend/global/advice/ErrorResponse.java

@@ -0,0 +1,10 @@
+package com.twtw.backend.global.advice;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class ErrorResponse {
+    private String message;
+}

backend/src/main/java/com/twtw/backend/global/advice/GlobalErrorAdvice.java

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+package com.twtw.backend.global.advice;
+
+import com.twtw.backend.global.exception.EntityNotFoundException;
+import com.twtw.backend.global.exception.WebClientResponseException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalErrorAdvice {
+
+    @ExceptionHandler(WebClientResponseException.class)
+    public ResponseEntity<ErrorResponse> webClientResponse(final WebClientResponseException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ErrorResponse(e.getMessage()));
+    }
+
+    @ExceptionHandler(EntityNotFoundException.class)
+    public ResponseEntity<ErrorResponse> entityNotFound(final EntityNotFoundException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ErrorResponse(e.getMessage()));
+    }
+}

backend/src/main/java/com/twtw/backend/global/exception/EntityNotFoundException.java

@@ -0,0 +1,9 @@
+package com.twtw.backend.global.exception;
+
+public class EntityNotFoundException extends IllegalArgumentException {
+    private static final String MESSAGE = "엔티티를 조회할 수 없습니다.";
+
+    public EntityNotFoundException() {
+        super(MESSAGE);
+    }
+}