ResponseDTO.java import lombok.AllArgsConstructor; import lombok.Builder; import lombok.Data; import lombok.NoArgsConstructor; import java.util.List; @Data @Builder @NoArgsConstructor @AllArgsConstructor public class ResponseDTO { private String error; private List data; } Hello.java import com.example.demo230123.dto.ResponseDTO; import org.springframework.http.ResponseEntity; import org.springf..
