"if" tag without strut

I've saw that in struts we've a "<s:if". Because I don't use strut, how to do it? I've many case where it would be very usefull!
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NargzulAsked:
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mrjoltcolaCommented:
Use the JSTL tags?

<c:if  should work



http://java.sun.com/products/jsp/jstl/
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NargzulAuthor Commented:
I've tried but I've some problem:

Caused by: org.apache.jasper.JasperException: /Menu.jsp(10,62) PWC6314: According to the TLD, the attribute test is not a deferred-value or deferred-method, but the specified value contains a #-expression

with this code:


    <c:if test="#{sessionInformations.authentificationUser}">
        
    </c:if>

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NargzulAuthor Commented:
I've change the # by $ and it works. can someone explain me why?
    <c:if test="${!sessionInformations.authentificationUser}">
 
    </c:if>

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serrutomCommented:
Use following:
<h:panelGroup rendered="${!sessionInformations.authentificationUser}">
   ...
</h:panelGroup>

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NargzulAuthor Commented:
It's not only for display element, I've by exemple "jsf:forward" elements.

As I've said it's work now, can you just say me why we must use a $ and not a # like I've done since there
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gudii9Commented:
usually expression language, jstl tags etc use $ related syntax...
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NargzulAuthor Commented:
Strange, I've used the #{} since there and this is the first time I've this problem.

Thank you
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