See here:
https://forums.oracle.com/forums/thread.jspa?threadID=2407365

I have a similar issue, too, where I reuse the stage with different scenes.


The following example doesn't make sense, but shows the memory leak. (just change the loop count).


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class TestApp extends Application {


    public static void main(String[] args) throws Exception {
        launch();
    }

    public void start(final Stage stage) throws Exception {

        for (int i = 0; i < 4000; i++) {
            stage.setScene(new Scene(new VBox()));
        }
        System.gc();
        System.out.println((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 + " KB");

        stage.show();
    }
}