Primefaces datatable filtering not working [duplicate]

Answer 1

I had the same error and could fix it by wrapping the dataTable with a <h:form>.

Answer 2

In short, I had the following and was causing the same error:

<f:facet name="header">Date</f:facet>
<f:facet name="filter">
<h:outputText value="Year: " />
<p:selectOneMenu onchange="PF('myTable').filter();">
    <f:selectItem itemValue="" itemLabel="All" />
    <f:selectItems value="#{bean.conditionalYears}" var="yearSelect" itemValue="#{yearSelect.value}" itemLabel="#{yearSelect.label}" />
</p:selectOneMenu>
</f:facet>

I had to remove everything from <f:facet name="filter" /> except the <p:selectOneMenu />

In my case, the <h:outputText /> (not limited to outputText) was causing ClassCastException in FilterFeature:277 that were swallowed by UIData.visitTree(VisitContext, VisitCallback) (doesn't have CATCH)

filterValue = ((ValueHolder) filterFacet).getLocalValue();

For some reason, filterFacet is an UIPanel, not a SelectOneMenu as expected.

So, the answer is: If you are using <f:facet name="filter" />, then try removing everything from it except your custom filter field.