cvc-id.3 in web.xml

Eclipse에서 web.xml을 수정하는데 다음과 같은 오류 메시지가 표시됬다.

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

해결

<?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" 
         xmlns:web="http://java.sun.com/xml/ns/javaee" 
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
         id="WebApp_ID" version="3.0">

xmlns="http://java.sun.com/xml/ns/javaee" 

해당 부분에서 java를 대문자로 변경해주었더니 오류가 사라졌다.

<?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" 
         xmlns:web="http://java.sun.com/xml/ns/javaee" 
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
         id="WebApp_ID" version="3.0">

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reference
https://stackoverflow.com/questions/3219639/cvc-id-3-error-in-web-xml