How to equals session in JSTL?

How to equals session in JSTL?

I have code:

 a:  <%=session.getAttribute(Common.SESSION_USER_ADMIN)%>
 <br>
 b:  <%=session.getAttribute(Common.SESSION_USER)%>
 <br>
 <c:if test="${(session.getAttribute(Common.SESSION_USER_ADMIN)).equals(session.getAttribute(Common.SESSION_USER))}"> 
      IF !
 </c:if>

My output is:

a: test@test.com
b: test@test.com

But i never get a statement in my IF, why? Where is a problem? Thank you.