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프로젝트 세팅 중 오류가 발생했습니다.

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

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에러로그

cvc-id.3

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

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해결

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

java를 Java로 변경 후 에러가 사라졌습니다.