DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled, but I have already defined rowKey

jsf primefaces selectable row-key
Amira picture Amira · Nov 12, 2012 · Viewed 7.8k times · Source

I've a selectable PrimeFaces 3.4.1 datatable:

<p:dataTable value="#{projectAdminisrationMB.selectedUserMemberOfGroups}" var="group1" 
    rowKey="#{group1.name}" selectionMode="single" selection="#{projectAdminisrationMB.selectedBelongToGroup}">
    ...
</p:dataTable>

I'm getting this error:

com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback visit Grave: javax.faces.FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled.

But I have already set rowKey as per FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled. How is this caused and how can I solve it?

Answer

BalusC picture BalusC · Nov 12, 2012

This can occur when the EL expression in the rowKey attribute ever evaluates null.

Make sure that the name property of your Group instance is never null. Otherwise better use a property representing the autogenerated DB primary key, such as #{group1.id} — if you have one.

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