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*)".

(properties?,settings?,resultObjectFactory?,typeAlias,typeHandler,transactionManager?,sqlMap+)+

此句话的意思就是properties，settings，resultObjectFactory，transactionManager标签可以出现0次或者1次，typeAlias，typeHandler标签可以出现0次或者多次，sqlMap标签至少出现1次。

检查文件是否是按照上面的顺序排列