Tomcat中web.xml语句顺序_在web.xml中寻找语句-优快云博客

本文链接：https://blog.youkuaiyun.com/linfenliang/article/details/39374355

本文详细解析了Tomcat启动时遇到的XML解析错误，指出错误在于web-app元素及其子元素的不正确顺序，并提供了修正方案，确保XML配置文件遵循DTD规范。

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tomcat不能正常启动，错误如下： org.xml.sax.SAXParseException: 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*)".

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So for the 2.3 version of the DTD, you have to put the tags in the correct order. You have:

<web-app>   <servlet></servlet>   <servlet-mapping></servlet-mapping>   <servlet></servlet>   <servlet-mapping></servlet-mapping>   <servlet></servlet>   <servlet-mapping></servlet-mapping>   <!-- ... -->   <listener></listener> </web-app>

But the DTD says it must be:

<web-app>   <listener></listener>   <servlet></servlet>   <servlet></servlet>   <servlet></servlet>   <!-- ... -->   <servlet-mapping></servlet-mapping>   <servlet-mapping></servlet-mapping>   <servlet-mapping></servlet-mapping>   <!-- ... --> </web-app>

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The error message tells you the order they must be in:

 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*)"

Means the order is:

icon (0 or 1 times) display-name (0 or 1 times) description (0 or 1 times) distributable (0 or 1 times) context-param (0 or more times) filter (0 or more times) filter-mapping (0 or more times) listener (0 or more times) servlet (0 or more times) servlet-mapping (0 or more times) session-config (0 or 1 times) mime-mapping (0 or more times) welcome-file-list (0 or 1 times) error-page (0 or more times) taglib (0 or more times) resource-env-ref (0 or more times) resource-ref (0 or more times) security-constraint (0 or more times) login-config (0 or 1 times) security-role (0 or more times) env-entry (0 or more times) ejb-ref (0 or more times) ejb-local-ref (0 or more times)

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