我使用的是Ubuntu 14.04 64位。我安装了Oracle-8 for Java，并从http://efxclipse.bestsolution.at/下载了e（fx）clipse软件包。
但是，现在我遇到了以下错误消息：
Exception in Application constructor
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:497)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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:497)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class ui.project.Main
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:907)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$156(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:819)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$50(GtkApplication.java:139)
... 1 more
Caused by: java.lang.NoClassDefFoundError: com/sun/javafx/Utils
at org.controlsfx.tools.Platform.getCurrentPlatform(Platform.java:65)
at org.controlsfx.tools.Platform.<clinit>(Platform.java:41)
at org.controlsfx.dialog.HeavyweightDialog.<clinit>(HeavyweightDialog.java:72)
at org.controlsfx.dialog.DialogFactory.createDialog(DialogFactory.java:58)
at org.controlsfx.dialog.Dialog.<init>(Dialog.java:295)
at org.controlsfx.dialog.Dialogs.buildDialog(Dialogs.java:1086)
at org.controlsfx.dialog.Dialogs.showCommandLinks(Dialogs.java:692)
at ui.project.Main.welcomeWindow(Main.java:175)
at ui.project.Main.<init>(Main.java:64)
... 13 more
Caused by: java.lang.ClassNotFoundException: com.sun.javafx.Utils
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 22 more
Exception running application ui.project.Main
在第175行中，主要的64个调用方法welcomeWindow包括以下行：
Action response = Dialogs.create()
.title("Welcome to the Dolphin UI")
.masthead(null)
.message("Please select an option to proceed.")
.showCommandLinks(links.get(3), links);
最佳答案
问题在于Java 8更新60中将类com.sun.javafx.Utils移到了com.sun.javafx.util.Utils包中。
我看到您在代码中使用了ControlsFX。然后，采用新版本的ControlsFX解决此问题。
更多信息：
https://bitbucket.org/controlsfx/controlsfx/issues/526/comsunjavafxutils-changes-to