p:selectOneMenu changed when tab is changed - jsf-2

Question

I have a Primefaces dialog, and inside it there is a tabView. In this tabView I have 3 tabs, each one called towards ui:include. In the first tab I have a selectOneMenu which defines a property called tipoProprietario from class ProprietarioORM. The navigation between tab is done not by tabs themselves (in this stage they're disabled) but towards commandButtons at bottom of dialog. When I click in a commandButton to pass from the first to second tab tipoProprietario is filled correctly. However, when I click to pass from second do third tab (or even to the first one), I found that the selectItem value is changed to null. Consequently, the tipoProprietario property is also changed to null. Debugging, I saw that first it is called the Select Item listener method and after the tipoProprietario setter.
Can someone explain why this it is happening? How to correct it?
dialog.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<p:dialog id="dlgEdicao" widgetVar="dlgEdicao" resizable="false"
closable="true" modal="true" closeOnEscape="true"
header="#{(proprietarioMB.edicao)? msg['proprietario.titulo.editar']: msg['proprietario.titulo.incluir']}">
<p:tabView id="tabEdicao" widgetVar="tabEdicao" dynamic="true"
styleClass="tabEdicaoProprietario" cache="false"
binding="#{proprietarioMB.tabEdicao}">
<p:tab id="tabProprietario" title="#{msg['proprietario.titulo']}"
disabled="#{not proprietarioMB.edicao}" titleStyleClass="">
<ui:include src="./aba_proprietario.xhtml" />
</p:tab>
<p:tab id="tabEnderecoContato"
title="#{msg['proprietario.titulo.aba.endereco']}"
disabled="#{not proprietarioMB.edicao}">
<ui:include src="./aba_endereco_contato.xhtml" />
</p:tab>
<p:tab id="tabVeiculo"
title="#{msg['proprietario.titulo.aba.veiculo']}"
disabled="#{not proprietarioMB.edicao}">
<ui:include src="./aba_veiculo.xhtml" />
</p:tab>
</p:tabView>
<f:facet name="footer">
<p:commandButton id="btnDialogoAnterior"
value="#{msg['titulo.anterior']}"
rendered="#{not proprietarioMB.edicao}" immediate="true"
disabled="#{not proprietarioMB.btnAnteriorHabilitado}"
actionListener="#{proprietarioMB.doEventClickBtnAnterior}"
update="#this tabEdicao btnDialogoSeguinte btnDialogoConcluir"
style="margin-right: 20px;" />
<p:commandButton id="btnDialogoSeguinte"
value="#{msg['titulo.proximo']} #{(not proprietarioMB.btnConcluirVisivel)? '': 'display: none;'}"
rendered="#{not proprietarioMB.edicao}"
actionListener="#{proprietarioMB.doEventClickBtnSeguinte}"
update="#this tabEdicao btnDialogoAnterior btnDialogoConcluir"
style="margin-right: 20px; #{(not proprietarioMB.btnConcluirVisivel)? '': 'display: none;'}" />
</f:facet>
</p:dialog>
</ui:composition>
aba_proprietario.xhtml (the first tab)
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<p:panel id="pnlDadosProprietario">
<p:focus for="selTipoEdicao" />
<p:fieldset id="fieldDadosProprietario"
legend="#{msg['proprietario.titulo']}"
rendered="#{not empty proprietarioMB.proprietario}">
<p:panelGrid id="pnlDadosProprietarioEdicao">
<p:row>
<p:column>
<p:outputLabel id="lblTipoEdicao"
value="#{msg['proprietario.titulo.tipo']}" for="selTipoEdicao" />
</p:column>
<p:column>
<p:selectOneMenu id="selTipoEdicao"
value="#{proprietarioMB.proprietario.tipoProprietario}"
valueChangeListener="#{proprietarioMB.doEventTipoDocumentoPesquisaChanged}"
immediate="true">
<f:selectItems value="#{proprietarioMB.tiposProprietarios}" />
<p:ajax event="change" update="txtDocumentoEdicao" />
</p:selectOneMenu>
</p:column>
<p:column>
<p:outputLabel id="lblDocumentoEdicao"
value="#{msg['proprietario.titulo.documento']}"
for="txtDocumentoEdicao" />
</p:column>
<p:column>
<p:inputMask id="txtDocumentoEdicao"
value="#{proprietarioMB.proprietario.documento}"
mask="#{proprietarioMB.mascaraDocumento}" />
</p:column>
</p:row>
</p:panelGrid>
</p:fieldset>
</p:panel>
</ui:composition>
The Managed Bean
#ManagedBean
#ViewScoped
public class ProprietarioMB {
private static final String MASCARA_CPF = "999.999.999-99";
private static final String MASCARA_CNPJ = "99.999.999/9999-99";
private static final SelectItem[] tiposProprietarios = new SelectItem[] {
new SelectItem(JURIDICA, JURIDICA.getDescricao()),
new SelectItem(FISICA, FISICA.getDescricao()), };
private ProprietarioORM proprietario;
private String mascaraDocumento;
private TabView tabEdicao;
/**
* Select Item listener method: Changes inputMask mask
*/
public void doEventTipoDocumentoPesquisaChanged(ValueChangeEvent event) {
this.mascaraDocumento = (event.getNewValue() == FISICA) ? MASCARA_CPF
: MASCARA_CNPJ;
}
public void doEventClickBtnAnterior() {
System.out.println("ProprietarioMB.doEventClickBtnAnterior(): "
+ this.tabEdicao.getActiveIndex());
this.tabEdicao.setActiveIndex(this.tabEdicao.getActiveIndex() - 1);
}
public void doEventClickBtnSeguinte() {
System.out.println("ProprietarioMB.doEventClickBtnSeguinte(): "
+ this.tabEdicao.getActiveIndex());
System.out.println("ProprietarioMB.doEventClickBtnSeguinte(): "
+ this.proprietario);
if (this.tabEdicao.getActiveIndex() == 0) {
if (this.validarProprietario()) { // Validation method
this.tabEdicao.setActiveIndex(1);
}
} else if (this.tabEdicao.getActiveIndex() == 1) {
this.tabEdicao.setActiveIndex(2);
}
}
// Other methods + getters & setters
}
ProprietarioORM
public class ProprietarioORM {
private String nome;
private TipoProprietarioEnum tipoProprietario;
// getters & setters
}

Answer 1

It's most likely because of the binding="#{proprietarioMB.tabEdicao}"
For one thing, you don't appear to need the binding at all. Even if you did, you failed to initialize the component in your backing bean, a bug that'll result in the <p:tabView/> attempting to bind to a null variable tabEdicao.
As you don't appear to be using the tabview variable in the backing bean, my recommendation would be to get rid of it. If you really need it, just initialize it:
private TabView tabEdicao = new TabView();

Answer 2

Kolossus:
This issue was resolved when I added the attibute dynamic="true" to dialog. Actually, the real value was dynamic=#{empty proprietarioMB.proprietario}, because I was geting NullPointerException when loading the page. proprietario property is loaded towards #PostConstruct method.