spring oracle java MySQL Spring valid mysql connector DB이전 System.currentTimeMilli UseGetTimeOfDay window 리눅스 BindingResult #RestAPI WSL hikariCP functional interface ConnectionPool SpringBoot Java8 Valid Factory Pattern Hikari SWAGGER 검증 데이터이전 마이그레이션 UTF-8 timezone annotation 어노테이션 hibernate 스프링 sqldeveloper encoding Merge API 한글 문법 injection CUSTOM migration bean HP