웹 어플리케이션 서버를 통해 동작하는 웹 어플리케이션에 대해 기능 일부를 수정하고자 할 때, 런타임 변경이 가능하고, 어플리케이션 서버의 재시작이 필요 없는 방법에 대해 설명한다. 이러한 방법은 웹 어플리케이션의 동적 설정을 위해 사용할 수 있으며, 변경된 내용을 반영하는데 1) 서버로 어플리케이션 전체를 재배포할 필요가 없으며, 2) 변경될 부분을 부분 코드에 국한시켜 웹 어플리케이션에서 자주 발생되는 SQL 기술문의 변경이나 비지니스 로직에 대한 작은 변경을 간편하게 수정하고 실행시킬 수 있다.
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