TreeGrid not expand

Vaadin 6 / 7 / 8
1

TreeGrid treeGrid = new TreeGrid();

    provedorCliente = new ProvedorDadosCliente();
    HierarchyData<Cliente> data = new HierarchyData<Cliente>();

    treeGrid.setDataProvider(new InMemoryHierarchicalDataProvider<Cliente>(data));

    InMemoryHierarchicalDataProvider<Cliente> dataProvider = (InMemoryHierarchicalDataProvider<Cliente>) treeGrid
            .getDataProvider();

    Cliente root = provedorCliente.getListaClientes().get(0);
    dataProvider.getData().addItem(null, root);

    Cliente c = provedorCliente.getListaClientes().get(1);
    Cliente c2 = provedorCliente.getListaClientes().get(2);

    root.setSub(new ArrayList<>());

    root.getSub().add(c);
    root.getSub().add(c2);
    
    dataProvider.getData().addItem(null, provedorCliente.getListaClientes().get(3));

    dataProvider.getData().addItems(root, root.getSub());

    treeGrid.addColumn(Cliente::getDataVisitaClienteFormatada).setCaption("Data Visita")
            .setId("datavisita");

    treeGrid.addColumn(Cliente::getCodCliente).setCaption("Cliente").setId("cliente-coluna");
    
    System.out.println(dataProvider.getData().getChildren(root));
    
    treeGrid.setHierarchyColumn("cliente-coluna");
    
    dataProvider.refreshAll();

    
    addComponent(treeGrid);

Just no expand

2

It is a bit hard to say based on just this code, but maybe the class Cliente does not have suitable equals()/hashCode() implementations.