cvc-id.3: A field of identity constraint 'web-app-filter-name-uniqueness' matched element 'web-app', but this element does not have a simple type.

에러 

cvc-id.3: A field of identity constraint 'web-app-filter-name-uniqueness' matched element 'web-app', but this element does not have a simple type.

 

web.xml에서

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://JAVA.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

java.sun.com 이부분에서 java를 대문자로 바꿔주면 해결된다.