java - JavaFX Dynamically Adding Elements to a GridPane -

i'm relatively new javafx , i've been pretty confused in why code below not produce intended result being label added grid.

what i'm trying run test adding javafx label fxml gridpane construct method in near-future allow user choose file, generate label when user has selected file , add label gridpane.

thanks in advance,

code:

private label label1;  @fxml private gridpane gridpane;  @fxml public void handle() {      filechooser filechooser = new filechooser();     filechooser.settitle("select file");     filechooser.getextensionfilters().addall(             new filechooser.extensionfilter("video files", "*.mp4", "*.avi"),             new filechooser.extensionfilter("audio files", "*.wav", "*.mp3", "*.aac"),             new filechooser.extensionfilter("all files", "*.*"));     //show open file dialog     file file = filechooser.showopendialog(null);      try {         system.out.println(file.getpath());         system.out.println(file.getname());         label1.settext(file.getname());         gridpane.add(label1, 1, 1);     } catch (exception e) {     }  } 

the fxml code standard file defined gridpane fx:id listed above.

you don't initialize label anywhere, null. since you're squashing exception, don't see nullpointerexception that's generated when call label1.settext(...)