Spring Boot flask WMS pandas REST API db SQL updatedAt createdAt GhatGPT BaseEntity orElseThrow orElseGet orElse 생성자 주입 제어의 역전 OpenAI jinja2 RequestParam 의존성 주입 Pageable 비지도학습 강화학습 GCP 지도학습 docker gradle DTO RequestBody PathVariable lombok Optional JPA data modeling Vo routing Machine learning read jar DI Create 머신러닝 bean Stream Maven dao Delete vm IOC War 생성자 service Private mvc Update HTTP 빈 JSON page session AWS static test API