The servlets .. are both mapped to the url-pattern [/ControllerServlet] which is not permitted

Caused by: java.lang.IllegalArgumentException: The servlets named [ControllerServlet] and [com.classmgt.servlet.ControllerServlet] are both mapped to the url-pattern [/ControllerServlet] which is not permitted

运行j2ee程序，一直遇到这个错，发现是因为新版本的eclipse不会去自己生成web.xml，也不需要自己去配置xml文件。

eclipse已经有另外一种好的解决方案：利用

@WebServlet

annotation

所以你重复配置了这个。

解决方案是删除web.xml文件。