今天用Eclipse创建jsp文件的时候，提示：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Bu
上网百度了一下：报错原因是：web工程缺少编译Tomcat运行时相关类，只要加上就行了。
找到出错的那个项目，右键选择 BulidPath,然后点击ConfigureBuildPath,选择Libraries,然后点击Add Library,选择ServerRuntime
就可以了。
如下：
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