错误一：
cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. One of
'{"http://java.sun.com/xml/ns/javaee":init-param}' is expected.
<async-supported>true</async-supported>
解决方案：
xmlns中再加两行
http://www.springmodules.org/schema/cache/springmodules-cache.xsd
http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd
如：
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd" 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">
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作者：再远不过PC
来源：CSDN
原文：https://blog.csdn.net/douboomfly/article/details/70200740
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