javafx.stage.Stage用于JavaFX11的无效版本

Question

我基于这示例在新的Java 11中创建了项目：

EntryPoint.java

package com.example;

import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;

public class EntryPoint extends javafx.application.Application {

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

  public void start(Stage stage) {
    Label label = new Label("Hello, JavaFX11！");
    Scene scene = new Scene(label, 640, 480);
    stage.setScene(scene);
    stage.show();
  }
}

pom.xml

<?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.example</groupId>
  <artifactId>Example</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
    <!-- https://mvnrepository.com/artifact/org.openjfx/javafx-controls -->
    <dependency>
      <groupId>org.openjfx</groupId>
      <artifactId>javafx-controls</artifactId>
      <version>11</version>
    </dependency>
  </dependencies>
</project>

没有来自IntellIJ IDEA方面的警告。当我试图编译时，我得到了错误(原件不是英文的，所以它可能与英文的原件不同)：

Error:(7, 20) java: Can not access to javafx.stage.Stage

Class C:\Users\XXXXX\.m2\repository\org\openjfx\javafx-graphics\11\javafx-graphics-11-win.
jar(javafx/stage/Stage.class) is invalid.

Class/File Version is 54.0; 52.0 is required.
Delete it, or set right directory.

更新

尝试设置JAVA_HOME系统变量：

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Answer 1

以防万一您可以尝试为Stage添加maven依赖项：

 <dependency>
      <groupId>org.openjfx</groupId>
      <artifactId>javafx-graphics</artifactId>
      <version>11</version>
  </dependency>

​

​