The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path

jsp파일 제일 첫번째 라인에 컴파일에러가 뜨는 문제 해결방법

Project 오른쪽마우스버튼클릭 -> Build Path -> Configure Build Path -> Libraries 탭 -> Classpath 클릭 -> Add Library -> Server Runtime -> Apache Tomcat v9.0 WAS 선택 -> 끝