cvc-complex-type.2.4.a: Invalid content was found starting with element(servlet)

解决方法:

将“http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd”这段话加入到xml文件的"xmlns:xsi="的标签中

<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance  
               http://www.springmodules.org/schema/cache/springmodulescache.xsd 
               http://www.springmodules.org/schema/cache/springmodulesehcache.xsd"    
          xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd       ">  

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原文链接：https://blog.csdn.net/suberft/article/details/79892072