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you want to display a “No records found” message when you have an empty HtmlDataTable in JSF

<h:dataTable var="row" value="#{mybean.rows}" rendered="#{mybean.rows.rowCount > 0}">

1. <h:column>
2. <f:facet name="header">
3. <h:outputText value="row title 1" />
4. </f:facet>
5. <h:outputText value="#{row.firstColumn}" />
6. </h:column>
7. <h:column>
8. <f:facet name="header">
9. <h:outputText value="row title 2" />
10. </f:facet>
11. <h:outputText value="#{row.secondColumn}" />
12. </h:column>
13. <h:column>
14. <f:facet name="header">
15. <h:outputText value="row title 3" />
16. </f:facet>
17. <h:outputText value="#{row.thirdColumn}" />
18. </h:column>
19. </h:dataTable>
20. <h:outputText value="No records found" rendered="#{mybean.rows.rowCount == 0}" />

http://www.webparation.org/2007/04/08/displaying-a-no-records-found-message-for-an-empty-jsf-htmldatatable/