Debian Jessie JavaFX MediaPlayer：无法创建播放器

Question

使用Ant配置运行Java应用程序时出现此异常。

Exception in thread "JavaFX Application Thread" MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player!

这是我的代码：

@Override public void start(Stage stage) {
    final Scene scene = new Scene(((Viewer)viewer).getPanel());
    Media theme = new Media(getHostServices().getDocumentBase() + "src/sound/theme_bttf.mp3");
    new MediaPlayer(theme).play();
}

有人对如何解决这个问题有想法吗？

我使用Gnome 3.14.1和Java在Debian Jessie 64bits上运行它：

java version "1.8.0_74"
Java(TM) SE Runtime Environment (build 1.8.0_74-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.74-b02, mixed mode)

编辑：

这是我在执行ant run时得到的堆栈跟踪：

run:
 [echo] ================ Run Object Main ================
 [java] Gtk-Message: Failed to load module "canberra-gtk-module"
 [java] Exception in Application start method
 [java] java.lang.reflect.InvocationTargetException
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [java]     at java.lang.reflect.Method.invoke(Method.java:498)
 [java]     at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
 [java]     at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [java]     at java.lang.reflect.Method.invoke(Method.java:498)
 [java]     at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
 [java] Caused by: java.lang.RuntimeException: Exception in Application start method
 [java]     at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
 [java]     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
 [java]     at java.lang.Thread.run(Thread.java:745)
 [java] Caused by: MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player!
 [java]     at javafx.scene.media.MediaException.exceptionToMediaException(MediaException.java:146)
 [java]     at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:511)
 [java]     at javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:414)
 [java]     at alpha.Main.start(Main.java:71)
 [java]     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
 [java]     at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
 [java]     at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
 [java]     at java.security.AccessController.doPrivileged(Native Method)
 [java]     at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
 [java]     at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
 [java]     at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
 [java]     at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
 [java]     ... 1 more
 [java] Caused by: com.sun.media.jfxmedia.MediaException: Could not create player!
 [java]     at com.sun.media.jfxmediaimpl.NativeMediaManager.getPlayer(NativeMediaManager.java:274)
 [java]     at com.sun.media.jfxmedia.MediaManager.getPlayer(MediaManager.java:118)
 [java]     at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:467)
 [java]     ... 11 more
 [java] Exception running application alpha.Main
 [java] Java Result: 1

编辑2：

我安装了libavcodec56 ， libavformat56和GLIB 2.42.1。

# pkg-config --modversion glib-2.0
2.42.1

Answer 1

在http://www.oracle.com/technetwork/java/javase/downloads/index.html的“ 认证系统配置”部分中

您必须安装GLIB 2.28才能运行JavaFX Media。

必须安装以下组件才能支持AAC音频，MP3音频，H.264视频和HTTP Live Streaming：

• Ubuntu Linux 12.04或同等版本上的libavcodec53和libavformat53。

[...]

• VP6视频支持不需要任何第三方模块。
• 在Linux平台上，安装libavformat会自动导致安装libavcodec。

请仔细检查您是否已安装所有必需的库。

Answer 2

Media的构造函数的参数为String ，必须将其格式化为有效的URI。 所以代替：

Media theme = new Media(getHostServices().getDocumentBase() + "src/sound/theme_bttf.mp3");

尝试这个：

Media theme = new Media(new File(getHostServices().getDocumentBase() + "src/sound/theme_bttf.mp3").toUri().toString());

Answer 3

在这种情况下有一个Java错误。 尝试下载已修复的新版本（我下载了jdk 8u102）。 http://www.oracle.com/technetwork/pt/java/javase/downloads/jdk8-downloads-2133151.html