The content of element type "web-app" must match "

导入工程，eclipse中报错：

The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-

 mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)".

问题原因：web.xml中可能顺序不对，比如servlet和servlet-mapping交叉出现或者filter和filter-mapping交叉

参考http://stackoverflow.com/questions/5712906/getting-error-the-content-of-element-type-web-app-must-match

解决方法有两种：

1.调整web.xml中节点顺序，先servlet再servlet-mapping（filter同理）

2.关闭eclipse中xml校验，步骤：Windows-Preference-Validation，disable all，apply再OK