spring security - Undefined attribute name (sec:authentication) -


i'm using thymleaf in spring security simple poc. below sample code in home.html file.

hello <span sec:authentication="name">user</span>!i

how rid of html warning 

undefined attribute name (sec:authentication).

i duplicate namespace sec tag , html warning disappear

<html xmlns="http://www.w3.org/1999/xhtml"     xmlns:th="http://www.thymeleaf.org"     xmlns:sec="http://www.thymeleaf.org">

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