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

在出现此错误的项目上单击鼠标右键》Build Path》Configure Build Path

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2017-04-21更新

到了加入Server Library步骤时，里面是空选项，没有Tomcat 7.0选择，怎么办？

參考：eclipse server配置之加入 Tomcat server

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