详解 问题：HttpServlet cannot be resolved to a type

HttpServlet cannot be resolved to a type

DescriptionResourcePathLocationType
HttpServlet cannot be resolved to a typeSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 15Java Problem
HttpServletRequest cannot be resolved to a typeSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 22Java Problem
HttpServletResponse cannot be resolved to a typeSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 22Java Problem
ServletException cannot be resolved to a typeSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 22Java Problem
The import javax.servlet cannot be resolvedSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 5Java Problem
The import javax.servlet cannot be resolvedSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 6Java Problem
The import javax.servlet cannot be resolvedSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 7Java Problem
The import javax.servlet cannot be resolvedSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 8Java Problem
The import javax.servlet cannot be resolvedSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 9Java Problem
WebServlet cannot be resolved to a typeSimpleServlet.java/JavaHelloWorldApp/src/main/java/wasdev/sample/servletline 14Java Problem

在文章 Java中REST API使用示例――基于云平台+云服务打造自己的在线翻译工具 中从IBM Bluemix上下载的Java示例代码，导入到Eclipse之后，出现以上错误信息！

错误原因：

Eclipse是刚刚安装的，还没有配置服务器运行环境！

解决办法：

1、首先要安装一下Tomcat；

通常是下载一个zip压缩包，解压一下就可以了；

2、Eclipse中点击Window菜单，选择Preferences

3、在左侧展开Server，选择Runtime Environment，右侧点击Add按钮

4、在弹出的窗口中选择你的Tomcat版本

5、点击“Browse”按钮选择Tomcat的安装位置，选择合适的JRE版本，点击Finish按钮完成。

通过上面的步骤，上面的错误都全部解决了，如果你的项目还显示 有错误，就需要考虑其它原因了。

可以参考：xxx cannot be resolved to a type 错误解决方法