1、WEB-INF下web.xml中servlet-class路径错误,正确路径为
servlet-class包名.类名/servlet-class
2、Libraries中没有servlet的jar包
若为missing,则remove后重启eclipse,下次启动会载入最新jar
若缺少jar包,则add
转载于:https://www.cnblogs.com/JICG/p/11507057.html