public void buildData(){
  ObservableList<ComboBox>  data = FXCollections.observableArrayList();

  Connection conn = db.makeConnection();
    try{
        String SQL = "Select Feature from FeaturesTable Order By Feature";
        ResultSet rs = conn.createStatement().executeQuery(SQL);
        while(rs.next()){
            ComboBox cb = new ComboBox();
            cb.featureCombo.set(rs.getInt("UserId"));

            featureCombo.add(cb);
        }
        featureCombo.setItems(data);
    }
    catch(Exception e){
          e.printStackTrace();
          System.out.println("Error on Building Data");
    }
}

@FXML
private ObservableList<ComboBox> featureCombo;