Primefaces validate cell editing - jsf

Question

I'm using cell editor in Primefaces to update cells in a datatable. However I want to validate the input before I confirm the change.
I have used FacesContext.getCurrentInstance().validationFailed(); for this purpose but still getting the cell updated.
This is how I'm implementing it:
<p:dataTable value="#{bean.list}" var="var" id="table" editMode="cell" editable="true">
<p:ajax event="cellEdit" listener="#{bean.onCellEdit}" update="#form"/>
<p:column headerText="Quantity">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{var.quantity}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{var.quantity}"/>
</f:facet>
</p:cellEditor>
</p:column>
</p:dataTable>
Bean Method:
public void onCellEdit(CellEditEvent event) {
//validate new value
if(!validate(event.getNewValue())){
//if validation returned false stop updating the cell
FacesContext.getCurrentInstance().validationFailed();
}
}
I want to stop updating the cell if the new value did not pass the validation, but the cell gets updated anyways. How can I solve this problem?
PS: Primefaces 3.5

Answer 1

What you're observing happens because because the celleditor's event happens in the INVOKE_APPLICATION phase, too late for any validation failure to have any effect.
You can just use the plain validator attribute on the <p:inputText/> like you would any other JSF input component. The behaviour will be the same, regardless of the fact that it's a facet of the <p:cellEditor/>