Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

完整错误信息:

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Description    Resource    Path    Location    Type
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path    add.jsp    /dwz-java/WebContent/WEB-INF/jsp/management/news    line 1    JSP Problem
Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

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Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

Java - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path