错误：无法找到或加载主类 application.Main 导致：java.lang.NoClassDefFoundError：javafx/application/Application JDK 11
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Error: Could not find or load main class application.Main Caused by: java.lang.NoClassDefFoundError: javafx/application/Application JDK 11
提问by Shahrukh S.
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:
我被困在一个非常基本的问题上。我使用 JavaFX 创建了一个简单的 hello world 程序，它在 JDK 1.8 上运行良好。但是当我切换到 JDK-11 时，它会抛出以下异常：
Error: Could not find or load main class application.Main
Caused by: java.lang.NoClassDefFoundError: javafx/application/Application
Following is the code I wrote in eclipse.
以下是我在eclipse中写的代码。
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);
}
}
回答by Alexandr Tkach
jdk 11 does not have javafx support. Oracle removed it. But you can add javafx to your project using Maven.
jdk 11 没有 javafx 支持。Oracle 删除了它。但是您可以使用 Maven 将 javafx 添加到您的项目中。
回答by Lotfi Hocini
I faced the same issue on debian after upgrading from stretch to buster, but now, everything is fine:
从stretch升级到buster后，我在debian上遇到了同样的问题，但现在一切都很好：
java --version
openjdk 11.0.4 2019-07-16
openjdk 11.0.4 2019-07-16
To run a java-fx application using terminal, follow these steps:
要使用终端运行 java-fx 应用程序，请按照下列步骤操作：
Install openjfx (if it is not already installed):
sudo apt install openjfxList the javafx library location:
dpkg-query -L openjfx
The output should be like this:
安装 openjfx（如果尚未安装）：
sudo apt install openjfx列出 javafx 库位置：
dpkg-query -L openjfx
输出应如下所示：
. /usr /usr/share /usr/share/doc /usr/share/doc/openjfx /usr/share/doc/openjfx/TODO.Debian /usr/share/doc/openjfx/changelog.Debian.gz /usr/share/doc/openjfx/copyright /usr/share/openjfx /usr/share/openjfx/lib /usr/share/openjfx/lib/javafx.properties /usr/share/openjfx/lib/javafx.base.jar /usr/share/openjfx/lib/javafx.controls.jar /usr/share/openjfx/lib/javafx.fxml.jar /usr/share/openjfx/lib/javafx.graphics.jar /usr/share/openjfx/lib/javafx.media.jar /usr/share/openjfx/lib/javafx.swing.jar /usr/share/openjfx/lib/javafx.web.jar
. /usr /usr/share /usr/share/doc /usr/share/doc/openjfx /usr/share/doc/openjfx/TODO.Debian /usr/share/doc/openjfx/changelog.Debian.gz /usr/share /doc/openjfx/copyright /usr/share/openjfx /usr/share/openjfx/lib /usr/share/openjfx/lib/javafx.properties /usr/share/openjfx/lib/javafx.base.jar /usr/share /openjfx/lib/javafx.controls.jar /usr/share/openjfx/lib/javafx.fxml.jar /usr/share/openjfx/lib/javafx.graphics.jar /usr/share/openjfx/lib/javafx.media .jar /usr/share/openjfx/lib/javafx.swing.jar /usr/share/openjfx/lib/javafx.web.jar
- 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
- 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
Example:
例子：
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'
回答by Nguy?n Tùng Lam
In Eclipse : run configurations -> arguments -> VM arguments :
在 Eclipse 中：运行配置 -> 参数 -> VM 参数：
--module-path ${project_classpath:REPLACE_ME_WITH_YOUR_PROJECT_NAME}
--add-modules javafx.controls,javafx.fxml
