Unable to settext on javafx text at runtime - javafx

Question

please i am trying to settext on a textfield after it as been open from login window but the changes it not displaying pls am new to java and javafx below is the code wich open the new window
try {
Statement stmnt= conn.createStatement();
rs=stmnt.executeQuery(sql);
if(rs.next()==true){
String name = null;
Image img = null;
name = rs.getString("name");
img = new Image(rs.getBinaryStream("photo"));
System.out.println(name);
Stage primaryStage = new Stage();
/*FXMLLoader loader = new FXMLLoader();
Pane root = loader.load(getClass().getResource("main.fxml").openStream());
mainController mnctrl = (mainController) loader.getController();
mnctrl.dispOpInfo(name, img);*/
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("main.fxml"));
Parent root = (Parent)fxmlLoader.load();
mainController controller = fxmlLoader.<mainController>getController();
controller.dispOpInfo(name, img);
primaryStage.show();
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("BECE 2017 Validation");;
primaryStage.getIcons().add(new Image(this.getClass().getResourceAsStream("icon.png")));
primaryStage.show();
//
}
and below is the code for the newly open window of it textfield is not changing at runtime
#FXML TextField txtSchName = new TextField();
public void populateCanInfo (String canSchool, String canName, String canState,String canGender, Image canPhoto){
System.out.println(canGender );
txtCanName.setText(canName);
txtSchName.setText(canSchool);
imgViewCan.setImage(canPhoto);
// int index=cmbCanState.getValue().indexOf(canState);
// cmbCanState.getSelectionModel().select(index);
if(canGender.equalsIgnoreCase(canGender)){
rbtMale.setSelected(true);
}else{
rbtFemale.setSelected(true);
}
}