如何修复JavaFX中的NoClassDefFoundError? [英] How to Fix NoClassDefFoundError in JavaFX?

问题描述

我正在尝试使用JavaFX构建一个小的用户界面，但是却出现了这样的错误:

I'm trying to build a small user interface using JavaFX, But I'm getting an error like this:

错误:找不到或加载主类myApp，原因是:java.lang.NoClassDefFoundError:javafx/application/Application

Error: Could not find or load main class myApp Caused by: java.lang.NoClassDefFoundError: javafx/application/Application

这是我的代码:和即时通讯使用jdk 12.0.2

This is my code: and im using jdk 12.0.2

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class myApp extends Application{
public static void main(String[] args) {
    Phonebook mybook = new Phonebook();
    launch(args);


}
@Override
public void start(Stage primaryStage) throws Exception {
    Group group = new Group();
    Scene scene = new Scene(group, 600, 300);
    scene.setFill(Color.GRAY);
    primaryStage.setTitle("Phone Book");
    primaryStage.setScene(scene);
    primaryStage.show();

}

这是我正在使用的库和jdk:图片1

This is the Libraries and jdk I'm using: Image1

推荐答案

我认为JavaFX不再是JDK> 9的一部分.(您的版本是12.x.x)

I think JavaFX is not a part of the JDK > 9 any more. (Your version is 12.x.x)

这可能会帮助您: https://openjfx.io/openjfx-docs/#install-javafx

(假设您正在使用Maven)如果这样做没有帮助，请尝试清理并构建您的应用程序.有时Maven无法识别新添加的依赖项.

(Assuming you are using Maven) If this does not help, try to clean and build your Application. Sometimes Maven does not recognize newly added dependencies.

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