The superclass javax.servlet.http.HttpServlet was not found on the Java Buid Path

jsp顶部出现The superclass javax.servlet.http.HttpServlet was not found on the Java Buid Path 解决方法: 错误: 项目中某一.jps页面忽然出现错误,鼠标点上去为:The superclass “javax.servlet.http.HttpServlet” was not found on the Java Bu
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