No grammar constraints (DTD or XML Schema) referenced in the document.

问题描述

web.xml 使用 Servlet4.0 版本，No grammar constraints (DTD or XML Schema) referenced in the document.

解决方法

添加 <!DOCTYPE html>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<web-app version="4.0" 
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee　　　    　 　　
    http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd">
  
</web-app>

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