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I'm trying to run an application using JavaFX in mac os but I get this error: 

Exception in thread "main" java.lang.RuntimeException: java.lang.NoSuchMethodError: getScaleFactor
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:281)
at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:124)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:163)
at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NoSuchMethodError: getScaleFactor
at com.sun.glass.ui.mac.MacApplication._initIDs(Native Method)
at com.sun.glass.ui.mac.MacApplication.<clinit>(MacApplication.java:34)
at com.sun.glass.ui.mac.MacPlatformFactory.createApplication(MacPlatformFactory.java:33)
at com.sun.glass.ui.Application.Run(Application.java:103)
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:271)
... 5 more

I package the application in one jar using fat jar plugin for eclipse with and without jfxrt.jar, and the problem still exists

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  • What Java Version do you run? Commented Mar 27, 2014 at 14:00
  • My first guess would have been an outdated java version but other than that from the stacktrace I can't think of the cause since JavaFX should be shipped with that version. Commented Mar 27, 2014 at 14:07

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application in one jar using fat jar plugin

Don't do that. If you want to use that plugin, to package JavaFX applications, then log a feature request with the plugin creators to add JavaFX support to the plugin.

Use packaging methods which are aware of JavaFX and will correctly package your JavaFX application, for example:

There is a chance that onejar might work for you out of the box with Java 8 as some of the classloading rules for JavaFX changed to be more relaxed for Java 8, I guess you could try it and see if it works.

I package the application . . . with . . . jfxrt.jar

I don't recommend this unless you are packaging the entire JRE with the app. Reasons for not doing this are explained in the answer to: Maven project with JavaFX (with jar file in `lib`) (I know you are not using Maven, but the reasoning is similar).

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