我一直在尝试使用 JavaFX 用 Java 制作一个简单的 GUI 播放器。在我尝试打开文件之前它工作正常。它只是抛出一个堆栈，什么也不做。
堆
Executing /home/julius/Templates/Java-Projects/JavaFXApplication1/dist/run1593625829/JavaFXApplication1.jar using platform /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Prism-ES2 Error : GL_VERSION (major.minor) = 1.4
(java:4134): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",
(java:4134): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",
文件路径是-file:///home/julius/Videos/MOVIES/SAW/sAw/Saw.mp4
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$5(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 48 more
Caused by: MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player!
at javafx.scene.media.MediaException.exceptionToMediaException(MediaException.java:146)
at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:511)
at javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:414)
at javafxapplication1.FXMLDocumentController.handleButtonAction(FXMLDocumentController.java:47)
... 58 more
Caused by: com.sun.media.jfxmedia.MediaException: Could not create player!
at com.sun.media.jfxmediaimpl.NativeMediaManager.getPlayer(NativeMediaManager.java:274)
at com.sun.media.jfxmedia.MediaManager.getPlayer(MediaManager.java:118)
at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:467)
... 60 more
Deleting directory /home/julius/Templates/Java-Projects/JavaFXApplication1/dist/run1593625829
jfxsa-run:
BUILD SUCCESSFUL (total time: 58 seconds)
[编辑-1]
package javafxapplication1;
import java.io.File;
import java.net.
import java.util.ResourceBundle;
import javafx.application.Platform;
import javafx.beans.binding.Bindings;
import javafx.beans.property.DoubleProperty;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.stage.FileChooser;
public class FXMLDocumentController implements Initializable {
private String filePath;
@FXML
private MediaPlayer mp;
@FXML
private MediaView mv;
@Override
public void initialize(URL arg0, ResourceBundle arg1) {}
@FXML
public void handleButtonAction(ActionEvent event) {
FileChooser fc= new FileChooser();
FileChooser.ExtensionFilter extensionFilter= new FileChooser.ExtensionFilter("Video files with mp4 extension only.", "*.mp4");
fc.getExtensionFilters().add(extensionFilter);
File file= fc.showOpenDialog(null);
filePath= file.toURI().toString();
if(filePath!= null) {
System.out.println("FilePath is- "+filePath);
Media media= new Media(filePath);
mp= new MediaPlayer(media);
mv.setMediaPlayer(mp);
DoubleProperty width= mv.fitWidthProperty();
DoubleProperty height= mv.fitHeightProperty();
width.bind(Bindings.selectDouble(mv.sceneProperty(), "width"));
height.bind(Bindings.selectDouble(mv.sceneProperty(), "height"));
mp.play();
}
}
@FXML public void playButton(ActionEvent event) {mp.play(); mp.setRate(1);}
@FXML public void pauseButton(ActionEvent event) {mp.pause();}
@FXML public void stopButton(ActionEvent event) {mp.stop();}
@FXML public void forwardButton(ActionEvent event) {}
@FXML public void rewindButton(ActionEvent event) {}
@FXML public void fasterButton(ActionEvent event) {mp.setRate(2);}
@FXML public void slowerButton(ActionEvent event) {mp.setRate(0.5);}
@FXML public void exitButton(ActionEvent event) {Platform.exit();}
}
路径似乎没问题，我想不出我的控制器源有什么问题，如果有人想查看源，请告诉我。我该如何解决这个未知的异常？
要记住的几件事
Java版本是
openjdk 版本“1.8.0_151”
OpenJDK 运行时环境（构建 1.8.0_151-8u151-b12-0ubuntu0.17.10.2-b12）
OpenJDK 64 位服务器 VM（内部版本 25.151-b12，混合模式）
我正在使用安装了所有 javafx 插件的 Netbeans IDE。