jsf - IF statement does not work inside Primefaces DataTable -

i want show row if have data it. code have is:

<p:datatable id="comments" var="comment"         value="#{agencybean.getcommentbyagency(agencybean.tagency)}"         paginator="true" >          <p:column>               #{comment.author.name}           </p:column>          <p:column>             <c:if test="${not empty comment.positivecomment}">                 <p:row>                     <p:column>                         <p:graphicimage library="images" name="positive.png" />                     </p:column>                     <p:column>  #{comment.positivecomment}  </p:column>                 </p:row>                 <br />             </c:if>         </p:column>     </p:datatable> 

but nevertheless have data, row not shown. how can implement logic? thanks!

try place condition expression in <p:row>'s tag itself, using rendered attribute :

<p:column>     <p:row rendered="#{not empty comment.positivecomment}">         <p:column>             <p:graphicimage library="images" name="positive.png" />         </p:column>         <p:column>  #{comment.positivecomment}  </p:column>     </p:row>     <br /> </p:column>