Some functions and code not invoked in initialize method in JavaFx

I tried to build a JavaFX application. In the controller some function in initialize method is not invoked.

For example:

@Override
public void initialize(URL location, ResourceBundle resources) {
    txt_name.requestFocus();
    btn_update.setVisible(false);
    btn_delete.setVisible(false);
    chk_active.setSelected(true);
    clear();
    listner_txtbx();
    setTable();
    Populate_Table();
}

In the above code, CheckBox selection code and Populate_table method are not invoked and all other methods and codes are invoked.

This is the controller file

public class BrandController implements Initializable {
    public TextField txt_id;
    public TextField txt_name;
    public TextField txt_remarks;
    public Button btn_save;
    public Button btn_update;
    public Button btn_delete;
    public Button btn_clear;
    public CheckBox chk_active;
    public TableView tbl_brand;
    public TableColumn col_slno;
    public TableColumn col_id;
    public TableColumn col_name;
    public TableColumn col_remarks;
    public TableColumn col_status;
    public Button btn_Close;
    private Stage stage_brand;
    ObservableList<obj_Brand> tblData = FXCollections.observableArrayList();
    DBMysql db = new DBMysql();

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        txt_name.requestFocus();
        btn_update.setVisible(false);
        btn_delete.setVisible(false);
        chk_active.setSelected(true);
        clear();
        listner_txtbx();
        setTable();
        Populate_Table();
    }

    private void clear(){
        txt_name.clear();
        txt_remarks.clear();
        setCode();
        txt_name.requestFocus();

    }

    private void Populate_Table(){
        System.out.println("inside table");
        tblData.clear();
        int status;
        if(chk_active.isSelected()){status=1;}else{status=0;}
        try {
            Statement st = db.con.createStatement();
            System.out.println("select * from " + db.schema + ".tbl_brand where status =" +status+ "");
            ResultSet rs = st.executeQuery("select * from " + db.schema + ".tbl_brand where status =" +status+ "");
            while (rs.next()) {
                tblData.add(new obj_BrandBuilder().setCode(rs.getString("code")).setName(rs.getString("name")).setRemarks(rs.getString("remarks")).setStatus(rs.getString("status")).createObj_Brand());
            }
            st.close();
        } catch (SQLException ex) {
            Logger.getLogger(BrandController.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

I tried the Populate_Table method using a Button On Action method and the code is working, but it's not invoked in the initialize method.

How can I fix this?

Preface

Put system.outs in you method and check If they really are not executed. I think they are executed.

Solution

Initialize is called after the controller creation is finished. Your Scene is not displayed yet.

Put your code in Platform.runLater(), this will put the execution in the future.

If this does not work, set the size of the stage to "+1" and after that again to "-1" (for width and height). This triggers the renderer.

If this does not work again, post a working minimal example of your code.