Java中Swing与JavaFX同时使用MigLayout报AbstractMethodError问题

应用以JavaFX程序形式启动，运行过程中会创建若干Swing JFrame实例，需要在Java Swing容器与JavaFX窗格中同时使用MigLayout作为布局管理器。仅在JavaFX中使用MigLayout时程序运行正常，一旦同时在Swing中加载该布局，就会抛出如下错误：

java.lang.AbstractMethodError: Receiver class net.miginfocom.swing.SwingComponentWrapper does not define or inherit an implementation of the resolved method abstract getContentBias()I of interface net.miginfocom.layout.ComponentWrapper.

复现代码 #

业务实现类 #

package com.myproj.mavenproject13;

import java.awt.Dimension;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
import javax.swing.JFrame;
import javax.swing.JTextField;
import net.miginfocom.swing.MigLayout;
import org.tbee.javafx.scene.layout.MigPane;


public class HelloWorld extends Application {
    private MigLayout migLayout = new MigLayout("debug, fillx", "", "");
    
    @Override
    public void start(Stage primaryStage) {
        MigPane migPane = new MigPane("debug, fillx", "", "");
        migPane.add(getButton1(), "grow, push, wrap");
        migPane.add(getButton2(), "grow, push");
        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(new Scene(migPane, 300, 250));
        primaryStage.show();
    }
    
    private Button getButton1(){
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new javafx.event.EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent t) {
                System.out.println("asd");
            }
        });
        return btn;
    }
    
    private Button getButton2(){
        Button btn = new Button();
        btn.setText("Create frame");
        btn.setOnAction(new javafx.event.EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent t) {
                JFrame f = new JFrame();
                f.setLayout(migLayout);
                JTextField jtf = new JTextField("asd");
                f.add(jtf, "growx, pushx");
                f.setTitle("my frame");
                f.setPreferredSize(new Dimension(400, 400));
                f.setVisible(true);
            }
        });
        return btn;
    }
}

项目主类 #

package com.proj.mavenproject13;

import javafx.application.Application;

public class Main {

    public static void main(String[] args) {
        Application.launch(HelloWorld.class, args);
    }

}

Maven pom.xml配置 #

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.proj</groupId>
    <artifactId>mavenproject13</artifactId>
    <version>1.0.0-RELEASE</version>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>17.0.1</version>
        </dependency>
        <dependency>
            <groupId>com.miglayout</groupId>
            <artifactId>miglayout-javafx</artifactId>
            <version>11.0</version>
        </dependency>
        <dependency>
            <groupId>com.miglayout</groupId>
            <artifactId>miglayout</artifactId>
            <version>3.7.4</version>
        </dependency>
    </dependencies>
</project>

核心问题是MigLayout依赖版本严重不匹配：

• 引入的miglayout-javafx 11.0会传递依赖同版本的核心包miglayout-core，该版本核心包的ComponentWrapper接口新增了getContentBias()抽象方法
• 手动引入的旧版Swing端MigLayout包miglayout 3.7.4发布时间远早于11.0版本，包内的SwingComponentWrapper实现类没有实现这个新增的抽象方法，类加载时检测到接口方法实现缺失，直接抛出AbstractMethodError。

MigLayout从4.0版本开始做了模块化拆分，Swing、JavaFX、SWT的适配包必须和核心包版本完全一致，不能跨大版本混用。

• 删除pom.xml中手动引入的3.7.4版本旧miglayout依赖
• 引入和miglayout-javafx同版本（11.0）的Swing适配包miglayout-swing，替换旧依赖，修改后的依赖配置如下：

<dependencies>
    <dependency>
        <groupId>org.openjfx</groupId>
        <artifactId>javafx-controls</artifactId>
        <version>17.0.1</version>
    </dependency>
    <dependency>
        <groupId>com.miglayout</groupId>
        <artifactId>miglayout-javafx</artifactId>
        <version>11.0</version>
    </dependency>
    <dependency>
        <groupId>com.miglayout</groupId>
        <artifactId>miglayout-swing</artifactId>
        <version>11.0</version>
    </dependency>
</dependencies>

• 修正线程调用问题：Swing组件的创建和显示必须放在Swing事件调度线程（EDT）中执行，原代码在JavaFX按钮回调中直接操作Swing组件属于线程不安全写法，需要将Swing相关逻辑包裹在SwingUtilities.invokeLater()中，修改按钮2的事件处理代码：

btn.setOnAction(new javafx.event.EventHandler<ActionEvent>() {
    @Override
    public void handle(ActionEvent t) {
        javax.swing.SwingUtilities.invokeLater(() -> {
            JFrame f = new JFrame();
            f.setLayout(new MigLayout("debug, fillx", "", ""));
            JTextField jtf = new JTextField("asd");
            f.add(jtf, "growx, pushx");
            f.setTitle("my frame");
            f.setPreferredSize(new Dimension(400, 400));
            f.pack();
            f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            f.setVisible(true);
        });
    }
});

刷新Maven依赖重新编译运行后，JavaFX侧MigPane和Swing侧MigLayout即可正常共存使用。

内容的提问来源于stack exchange，提问作者BabaNew