jsf 2 - <c:if><c:otherwise> does not work, both conditions evaluate like true -

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i trying toggle between 2 different command buttons depending on whether list contains given item id:

               <c:if test="#{roomservicemanagerbean.holdinghotelvilla.contains(hotel.hotelvillaid)}">                     <p:commandbutton ajax="true" id="commanddeactivate" update=":roomserviceform:hoteltable,:roomserviceform:msgs" actionlistener="#{roomservicemanagerbean.deactivateserviceforhotel(hotel.hotelvillaid)}" icon="ui-icon-radio-off" type="submit" value="remove service">                         <f:param name="roomserviceid" value="#{roomservicemanagerbean.roomserviceid}" />                     </p:commandbutton>                 </c:if>                 <c:otherwise>                     <p:commandbutton id="commandactivate" update=":roomserviceform:hoteltable,:roomserviceform:msgs" actionlistener="#{roomservicemanagerbean.activateserviceforhotel(hotel.hotelvillaid)}" icon="ui-icon-radio-on" type="submit" value="provide service">                         <f:param name="roomserviceid" value="#{roomservicemanagerbean.roomserviceid}" />                     </p:commandbutton>                 </c:otherwise>

however, fails , both buttons appear. how caused , how can solve it?

the <c:if> in construct fail if #{hotel} not available during view build time during view render time (e.g. because it's definied <p:datatable var>). <c:otherwise> displaced here. belongs <c:choose><c:when>. technically, should using <c:if> instead negation in test. or, should replacing first <c:if> <c:when> , wrap whole thing in <c:choose>. still fail if #{hotel} not available during view build time.

just use jsf component's rendered attribute instead.

<p:commandbutton ... rendered="#{roomservicemanagerbean.holdinghotelvilla.contains(hotel.hotelvillaid)}">     ... </p:commandbutton> <p:commandbutton ... rendered="#{not roomservicemanagerbean.holdinghotelvilla.contains(hotel.hotelvillaid)}">     ... </p:commandbutton>

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