Spring Exception Handler
@RestControllerAdvice, @ExceptionHandler
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Spring Validation
Spring Validation Type
Object Mapper
Jackson JsonNode ObjectNode ArrayNode
AOP, IOC, DI
Aspect Oriented Programming, Inversion of Control, Dependency Injection
String, StringBuffer, StringBuilder
성능 우선 StringBuilder > StringBuffer »> String 단순 조회 : String 2. Multi Thread : StringBuffer(안전) + 잦은 수정 3. Single Thread : StringBuilder(빠름) + 잦은...