错误:找不到或加载主类应用程序.主因:java.lang.NoClassDefFoundError:javafx/application/Application JDK 11

问题描述

我陷入一个非常基本的问题.我使用JavaFX创建了一个简单的hello world程序，该程序在JDK 1.8上运行良好.但是，当我切换到JDK-11时，它将引发以下异常:

I am stuck at a very basic problem. I have created a simple hello world program using JavaFX which works fine on JDK 1.8. But when I switch to JDK-11 it throws following exception:

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

以下是我在eclipse中编写的代码.

Following is the code I wrote in eclipse.

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;


public class Main extends Application {

    private Scene theScene;
    @Override
    public void start(Stage primaryStage) {
try {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("MyScene.fxml"));
            Parent mainPane = loader.load();


            theScene = new Scene(mainPane);
            primaryStage.setScene(theScene);
            primaryStage.show();

        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public void setTheScene(Scene theScene) {
        this.theScene = theScene;
    }

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

推荐答案

从Stretch升级到Buster后，我在debian上也遇到了同样的问题，但是现在，一切都很好:

I faced the same issue on debian after upgrading from stretch to buster, but now, everything is fine:

java --version

要使用终端运行Java-fx应用程序，请按照以下步骤操作:

To run a java-fx application using terminal, follow these steps:

1. 安装openjfx(如果尚未安装):
   sudo apt install openjfx

1. Install openjfx (if it is not already installed):
   sudo apt install openjfx

列出javafx库的位置:
dpkg-query -L openjfx
输出应该是这样的:

List the javafx library location:
dpkg-query -L openjfx
The output should be like this:

1. 通过包含javafx路径和模块来运行jar应用程序 :
   java --module-path $PATH_TO_OPENJFX-LIB --add-modules module_1,module_2,module_3,...,module_n -jar $PATH_TO_JAR_FILE

1. Run the jar application by including the javafx path and modules:
   java --module-path $PATH_TO_OPENJFX-LIB --add-modules module_1,module_2,module_3,...,module_n -jar $PATH_TO_JAR_FILE

示例:

java --module-path /usr/share/openjfx/lib --add-modules=javafx.controls,javafx.fxml,javafx.base,javafx.media,javafx.web,javafx.swing -jar '/home/lotfi/Documents/MyAppfolder/my_application.jar'

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