Attribute "xmlns" was already specified for element "web-app"._: attribute "connectiontimeout" was already specif-优快云博客

本文链接：https://blog.youkuaiyun.com/jhope/article/details/51553802

本文解决了一个关于web.xml文件中属性xmlns重复指定的问题。通过删除多余的命名空间声明，成功修正了错误，确保了web应用配置文件的有效性和正确性。

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\src\main\webapp\WEB-INF项目的web.xml发生错误

Attribute "xmlns" was already specified for element "web-app".

-----------------修改前------------------------------------------------

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee" xmlns="http://java.sun.com/xml/ns/javaee" 《===============删除
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

-----------------修改后------------------------------------------------

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

-----------------修改前------------------------------------------------

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee" xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">