Java Web 项目报错The superclass "javax.servlet.http.HttpServlet" was not found on the Java Bui
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原因是你的项目配置的库有问题，没有吧Tomcat服务器的库配置进去，要重新配置
添加库
选择Server Runtime后点击下一步
选中Tomcat服务器，点击finish
成功导入后就会发现少了的下图第一个库又回来了
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