page can't get value from Bean - jsf-2

Question

I have a table p:dataTable. When I select an item, it's refresh another p:dataTable with associed values.
It's works fine. But when I select an item in the second table, the page (xhtml) don't get the value from the bean.
In debug mode I see that the value is updated on bean, but acessing #{bean.value} is always null.
Where is the codes:
<h:form id="form">
<h:panelGrid columns="2">
<!-- FRIST TABLE -->
<p:dataTable id="alunos" var="aluno" emptyMessage="Nenhum aluno cadastrado" value="#{alunos.usuarios}" selectionMode="single" selection="#{alunos.usuarioSelecionado}" rowKey="#{aluno.id}">
<f:facet name="header">
Alunos
</f:facet>
<p:ajax event="rowSelect" listener="#{alunos.onRowSelect}" update=":form:disci" />
<p:column headerText="Nome" width="60%">
<h:outputText value="#{aluno.nome}" />
</p:column>
<p:column headerText="Curso">
<h:outputText value="Default" />
</p:column>
</p:dataTable>
<!-- FUNCTIONS FOR FRIST TABLE THAT ARE WORKING -->
<p:column rowspan="4">
<p:commandButton value="Adicionar" update="alunos" icon="ui-icon-plus" actionListener="#{alunos.addUser()}"/>
<p:commandButton value="Editar" icon="ui-icon-pencil" actionListener="#{alunos.editarUser()}"/>
<p:commandButton value="Remover" icon="ui-icon-close" actionListener="#{alunos.apagaUser()}"/>
</p:column>
</h:panelGrid>
<p:outputLabel for="disci" value="Disciplinas que o aluno cursa" />
<!-- SECOND TABLE - Updated when an iten is selected in frist table (working)-->
<p:dataTable id="disci" var="disciplina" emptyMessage="Selecione um aluno" value="#{alunos.disciplinas}" selectionMode="single" selection="#{alunos.disciplinaSelecionada}" rowKey="#{disciplina.id}">
<p:ajax event="rowSelect" listener="#{alunos.onRowSelectDisciplina}" oncomplete="PF('dDialog').show()"/>
<p:column headerText="Nome" width="80%">
<h:outputText value="#{disciplina.nome}" />
</p:column>
</p:dataTable>
<!-- Dialog to show informations - ALWAYS NULL -->
<p:dialog header="Info" widgetVar="dDialog" modal="true" showEffect="fade" hideEffect="fade" resizable="false">
<p:outputPanel id="detail" style="text-align:center;">
<p:panelGrid columns="2" columnClasses="label,value">
<h:outputText value="Id:" />
<h:outputText value="#{alunos.disciplinaSelecionada.id}" />
<h:outputText value="Nome" />
<h:outputText value="#{alunos.disciplinaSelecionada.nome}" />
</p:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
And the Bean:
#ManagedBean(name = "alunos")
#ViewScoped
public class Alunos extends NovoUsuario {
private Disciplina disciplinaSelecionada;
public Alunos() {
super(TiposUsuario.ALUNO);
}
//Method called when an iten is selected in SECOND TABLE
//In debug, the Object Disciplina is correct, as selected in table.
public void onRowSelectDisciplina(SelectEvent event) {
this.disciplinaSelecionada = (Disciplina) event.getObject();
}
//getters and setters
}
extended class:
public class NovoUsuario implements Serializable{
private List<Usuario> usuarios;
protected Usuario usuarioSelecionado;
TiposUsuario tipo;
private String nome;
private String senha;
protected List<Disciplina> disciplinas;
//Constructor
public NovoUsuario(TiposUsuario tipo) {
this.tipo = tipo;
}
//Initialize FRIST TABLE
#PostConstruct
public void init() {
UsuarioCRUD usuarioCRUD = new UsuarioCRUD();
this.usuarios = usuarioCRUD.listarTipoUsuario(tipo);
}
//Method used in FRIST TABLE
public void onRowSelect(SelectEvent event) {
disciplinas = getDisciplinaUsuario();
}
//Method that get data to SECOND table when a row is selectd in frist
public List<Disciplina> getDisciplinaUsuario() {
DisciplinaCRUD dcrud = new DisciplinaCRUD();
if (usuarioSelecionado != null) {
return dcrud.listaDisciplinasUsuario(usuarioSelecionado);
}
return null;
}
public void salvaUsuario() {
/* code to create*/
}
public void editarUser(){
/* code to update*/
}
public void apagaUser(){
/* code to delete*/
}
//GETTERS AND SETTERS
}
image: http://i.stack.imgur.com/Qbs0T.png
repository: https://bitbucket.org/VagnerGon/novo-academico

Answer 1

I'd say you just need to update the dialogs content from the p:ajax in the second table - just as you update the second datatable, when you select in the first.
So add id="dialog" to the dialog, and make the p:ajax in the second table
<p:ajax event="rowSelect" listener="#{alunos.onRowSelectDisciplina}" update=":form:dialog" oncomplete="PF('dDialog').show()" />
Or omit the new id and just do update=":form:detail".