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