Primefaces: setPropertyActionListener. Parameter gets null value - datagrid

Question

I have a dataGrid that iterates a list of object. In each grid I have a commandButton and a tag that tries to put the Id of the object selected in the backing bean, but when action is executed, and also in the setter method of the property, the value is null.
Here is my code:
<p:dataGrid var="element" value="#{CentroController.profiles}" columns="3"
rows="10" paginator="true" paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" >
<p:panel header="#{CentroController.getDescripcionRoot(element)}" style="text-align:center">
<h:panelGrid columns="2" style="width:100%">
<p:panel>
<p:commandButton value="Borrar perfil" icon="ui-icon-trash" update=":form:tabView:profileButtonPanel" action="#{CentroController.deletePerfil}">
<f:setPropertyActionListener value="#{element.id}" target="#{CentroController.selectedItemId}" />
</p:commandButton>
</p:panel>
</h:panelGrid>
</p:panel>
</p:dataGrid>
In the backing bean:
public void deletePerfil()
{
System.out.println("SELECTED ITEM ID: " + this.selectedItemId);
// selectedItemID is always null
}
When setter is called, the value is also null:
public void setSelectedItemId(BigDecimal selectedItemId) {
System.out.println(selectedItemId); // Value is null
this.selectedItemId = selectedItemId;
}
Thanks.
Edit: the code of the bean (I removed irrelevant methods).
/* imports */
#Named("CentroController")
#SessionScoped
public class CentroController implements Serializable{
private #Inject CentrosDAO dao;
private #Inject CentrosCanalesDAO daoServicios;
private #Inject CatalogoCentrosLaboratorioDAO habitualLabDAO;
private #Inject CatalogoCentrosRadiologiaDAO habitualRadDAO;
private List<Centros> centros;
private Centros selectedCentro;
private List<CentrosCanales> selectedCanales=new ArrayList<CentrosCanales>();
private List<CentrosCanales> listado;
private CentrosCanales selected;
private CatalogoCentros selectedItem;
private BigDecimal selectedItemId;
private TreeNode root;
private DualListModel<Catalogo> listCatalogo;
private DualListModel <Catalogo> listCatalogoLabHabitual;
private DualListModel <Catalogo> listCatalogoRadHabitual;
private CatalogoCentros perfilNuevo=new CatalogoCentros();
private #Inject CentrosCanalesDAO consulta;
private #Inject CatalogoCentrosDAO consulta1;
private #Inject CatalogoDAO consulta2;
private boolean servicioIsSelected; //, perfilIsSelected, pruebaIsSelected;
private List<CatalogoCentros> profiles;
public CentroController() {
}
#PostConstruct
public void init(){
this.centros=dao.obtenListaCentros();
servicioIsSelected = false;
//perfilIsSelected = false;
}
public BigDecimal getSelectedItemId() {
return selectedItemId;
}
public void setSelectedItemId(BigDecimal selectedItemId) {
System.out.println(selectedItemId);
this.selectedItemId = selectedItemId;
}
public void deletePerfil()
{
System.out.println("SELECTED ITEM ID: " + this.selectedItemId);
}
}
UPDATED
The dataGrid is inside a rowExpansion tag within a datatable. I realized that if I put the dataGrid outside instead of nested in the datatable, it works. But I want it in the rowExpansion.
It only works If I put the datagrid outside of the tabView in which is included.

Answer 1

Some questions about CatalogoCentros:
Is the id field a BigDecimal?
Did you override the hashCode and equals?
If "no" to question 2, do something like this:
#Override
public int hashCode() {
return (id != null) ? id.intValue() : 0;
}
#Override
public boolean equals(final Object obj) {
if (obj instanceof CatalogoCentros) {
CatalogoCentros item = (CatalogoCentros) obj;
return item.getId().equals(getId());
}
return false;
}
Set a breakpoint in your equals method and see if that gets tripped when you select something in the dataGrid.