Swing JFrame导致JavaFX应用程序在OS X上崩溃

Question

我正在开发一个复杂的JavaFX项目,它应该包含Swing JFrames.一切正常,JFrame然而在某些条件下拒绝关闭,锁定整个VM.我把所有东西都煮到了最低限度的工作示例,这似乎适用于Windows(请确认它是否适用于您的计算机)但可靠地崩溃OS X. 我正在使用Java 8u25(最新稳定版)和8u40预览版(最新版本) - 没有区别.

如何重现:将程序保存为"JavaFXWithJFrames.java",编译并运行它.现在有3个Swing JFrame和1个带3个按钮的JavaFX窗口.单击按钮应分别关闭其中一个窗口.这适用于Windows(？),但完全锁定OS X上的程序(可能还有其他操作系统？)

你能复制一下吗？是/否,哪台机器/ OS/JRE？我在这里做错了什么 - 线程问题？非常感谢你的帮助.

关于pastebin的代码:http://pastebin.com/tUrdNfCw# - 请保存为"JavaFXWithJFrames.java"进行编译!

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
//package javafxwithjframes;

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.HBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
import javax.swing.JFrame;

/**
 * When starting, a JavaFX window and 3 Swing JFrame-windows appear.
 * The JavaFX window features 3 buttons that each are supposed to close one of the JFrames.
 * The program, however, freezes after clicking a button. What am I doing wrong?
 * It seems to work on Windows, but crash on OS X 10.10.1, using Java 8u25 (latest release) and Java 8u40 Dec 31 preview-build.
 *
 * @author a desperate developer
 */
public class JavaFXWithJFrames extends Application {

JFrame jframe1, jframe2, jframe3;

@Override
public void start(Stage primaryStage) {

    // Create 3 JFrames
    jframe1 = new JFrame("JFrame 1");
    jframe1.setBounds(50, 50, 200, 150);
    jframe1.setVisible(true);

    jframe2 = new JFrame("JFrame 2");
    jframe2.setBounds(275, 50, 200, 150);
    jframe2.setVisible(true);

    jframe3 = new JFrame("JFrame 3");
    jframe3.setBounds(500, 50, 200, 150);
    jframe3.setVisible(true);

    // Create 3 buttons that close each one JFrame
    // Button 1
    Button closeButton1 = new Button();
    closeButton1.setText("Close JFrame 1");
    closeButton1.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            jframe1.setVisible(false);
            System.out.print("Closing JFrame 1...");
            jframe1.dispose();
        }
    });

    // Button 2
    Button closeButton2 = new Button();
    closeButton2.setText("Close JFrame 2");
    closeButton2.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            jframe2.setVisible(false);
            System.out.print("Closing JFrame 2...");
            jframe2.dispose();
        }
    });

    // Button 3
    Button closeButton3 = new Button();
    closeButton3.setText("Close JFrame 3");
    closeButton3.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            jframe3.setVisible(false);
            System.out.print("Closing JFrame 3...");
            jframe3.dispose();
        }
    });

    // Setting up main window
    HBox rootBox = new HBox();
    rootBox.getChildren().addAll(closeButton1, closeButton2, closeButton3);
    Scene scene = new Scene(rootBox, 400, 250);
    primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
        @Override
        public void handle(WindowEvent event) {
            System.exit(0);
        }
    });
    primaryStage.setTitle("JavaFX with JFrames");
    primaryStage.setScene(scene);
    primaryStage.show();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}

}

Answer 1

你有一个线程问题:你正在FX应用程序线程上做所有事情,而Swing工作应该在AWT事件派发线程上.

您可以使用调度代码在AWT事件处理线程上运行SwingUtilities.invokeLater(...);.

所以你的代码应该是这样的

@Override
public void start(Stage primaryStage) {

    SwingUtilities.invokeLater( () -> {
        // Create 3 JFrames
        jframe1 = new JFrame("JFrame 1");
        jframe1.setBounds(50, 50, 200, 150);
        jframe1.setVisible(true);

        jframe2 = new JFrame("JFrame 2");
        jframe2.setBounds(275, 50, 200, 150);
        jframe2.setVisible(true);

        jframe3 = new JFrame("JFrame 3");
        jframe3.setBounds(500, 50, 200, 150);
        jframe3.setVisible(true);
    });

    // Create 3 buttons that close each one JFrame
    // Button 1
    Button closeButton1 = new Button();
    closeButton1.setText("Close JFrame 1");
    closeButton1.setOnAction(event -> {
        SwingUtilities.invokeLater(() -> {
            jframe1.setVisible(false);
            System.out.print("Closing JFrame 1...");
            jframe1.dispose();
        });
    });

    // similarly for other button handlers...

}

(我将事件处理程序更改为lambda表达式,因为嵌套的内部类太简单了,你说你使用的是JDK 8 ...)

您也可以尝试按原样运行应用程序,但使用实验系统属性

-Djavafx.embed.singleThread=true

这在同一个线程上运行两个UI工具包.由于(据我所知)这仍然是实验性的,我建议在"正确"的线程上安排代码,如上所示.