Run code:


import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Modality;
import javafx.stage.Stage;

public class JavaApplication1 extends Application {

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

    @Override
    public void start(final Stage stage) throws Exception {
        final Stage stageWin = new Stage();
        
        stageWin.initModality(Modality.WINDOW_MODAL);
        stageWin.initOwner(stage);
        
        Button b = new Button("ClickMe");
        b.setOnAction(new EventHandler<ActionEvent>(){

            @Override
            public void handle(ActionEvent t) {
                stageWin.show();
            }
        });
        
                Button b2 = new Button("Hide");
        b2.setOnAction(new EventHandler<ActionEvent>(){

            @Override
            public void handle(ActionEvent t) {
                stage.close();
                stageWin.close();
            }
        });
        
        VBox vb = new VBox();
        vb.getChildren().addAll(b2);
        Scene scene = new Scene(vb, 300, 300);
        
        stageWin.setScene(scene);
        
        VBox vb2 = new VBox();
        vb2.getChildren().add(b);
        
        Scene scene2 = new Scene(vb2, 300, 300);
        
        stage.setScene(scene2);
        stage.show();
    }
}

click on button "click", click on button "hide" on the appeared stage.

Fatal error:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fb7280c29c1, pid=26662, tid=140424416970496
#
# JRE version: 7.0_06-b22
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.2-b09 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libglass.so+0x139c1] Java_com_sun_glass_ui_gtk_GtkWindow__1getNativeWindowImpl+0x1
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/fx/NetBeansProjects/JavaApplication1/hs_err_pid26662.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Java Result: 134