Table does not update correctly after editing

Question

I have a dataTable and in the last column I have an edit button that opens a dialog with a field to be filled. When I click edit the table is updated with the edited data, but if I give an F5 the old data comes back to dataTable.

Edit method in bean:

public void pausarTarefa(){
        System.err.println("Pausar");
        try {
            tarefa.setStatus("Pausado");
            tarefa.setDataFim(new Date());

            TarefaDAO tarefaDAO = new TarefaDAO();
            tarefaDAO.editar(tarefa);   
            FacesUtil.adicionarMsgInfo("Tarefa Pausada com Sucesso");
            tarefa = new Tarefa();
        } catch (RuntimeException e) {
            FacesUtil.adicionarMsgErro("Erro ao Pausar Tarefa");
            e.printStackTrace();
        }
    }

Method that fills the list used in the datatable:

@PostConstruct
public void listar() {
    listaTarefa = new ArrayList<>();
    System.err.println("Metodo Listar");
    try {
        TarefaDAO tarefaDAO = new TarefaDAO();
        listaTarefa = tarefaDAO.listarPorUsuario(usuarioBean
                .getUsuarioLogado());

    } catch (RuntimeException e) {
        FacesUtil.adicionarMsgErro("Erro ao listar tarefas: "+e.getMessage());
    }
}

The scope of the bean is ViewScoped. In the database the data is correct after editing, it is only the datatable that brings the old data. Someone can help?

---

Datatable:

p:dataTable value="#{tarefaBean.listaTarefa}" id="tarefaTable"
                var="tarefa" style="margin-top: 20px"
                emptyMessage="Nenhuma Tarefa Encontrada. " rows="10"
                paginator="true" paginatorAlwaysVisible="false"
                paginatorPosition="botton">

Answer 1

I will explain what is happening. First your dataTable is calling the listaTarefa but when you call the method pausarTarefa() you’re not updating your listaTarefa and its dataTable.

What you can do to solve your problem: within the method pausarTarefa() call the method listar(), so your list will be updated. Well now last you need to update your dataTable, use update button(update="tarefaTable") or a <p:ajax> whichever.

Edit:

change your method, remove the @PostConstruct:

 public List<Tarefa> listar() {
        List<Tarefa> lista = new ArrayList<>();
        System.err.println("Metodo Listar");
        try {
            TarefaDAO tarefaDAO = new TarefaDAO();
            lista = tarefaDAO.listarPorUsuario(usuarioBean.getUsuarioLogado());
        } catch (RuntimeException e) {
            FacesUtil.adicionarMsgErro("Erro ao listar tarefas: " + e.getMessage());
        }
        return lista;
    }

and alters its dataTable:

p:dataTable value="#{tarefaBean.listar}" id="tarefaTable"
                var="tarefa" style="margin-top: 20px"
                emptyMessage="Nenhuma Tarefa Encontrada. " rows="10"
                paginator="true" paginatorAlwaysVisible="false"
                paginatorPosition="botton">

Answer 2

Problem solved. Talking to a friend I found that appointments also have to be committed. So my DAO consultation was this way:

@SuppressWarnings("unchecked")
      public List<Tarefa> listarPorUsuario(Usuario usuario) {
       Session sessao = HibernateUtil.getSessionFactory().openSession();
       Transaction transacao = sessao.beginTransaction();

       List<Tarefa> lista = new ArrayList<>();
       try {
        Query consulta = sessao.getNamedQuery("Tarefa.listarPorCodigo");
        consulta.setParameter("usuario", usuario);
        lista = consulta.list();
        System.err.println("LISTA no DAO: "+lista);
        transacao.commit();
       } catch (RuntimeException ex) {
        throw ex;
       } finally {
        sessao.close();
       }
       return lista;
      }