How to get the version number of JavaFX?

Question

How can I find out at runtime which version of JavaFX I'm using?

Answer 1

One of simple ways is to simply read the javafx.properties file located in your $JAVA_HOME/jre/lib directory.

I have Java 1.7 u9 installed at the moment. JavaFX bundled with it is v2.0.3 so the abovementioned file contains the following line:

javafx.runtime.version=2.0.3

Answer 2

com.sun.javafx.runtime.VersionInfo.getRuntimeVersion();

Answer 3

System.getProperty( "javafx.runtime.version" )

You can get the javafx.runtime.version number from a System Property.

Call System.getProperty, passing the property name "javafx.runtime.version".

import javafx.application.Application;
import javafx.stage.Stage;
public class ReportVersion extends Application {
  public static void main(String[] args) { launch(args); }
  @Override public void start(Stage stage) {
    System.out.println("javafx.runtime.version: " + System.getProperty("javafx.runtime.version"));
    System.exit(0);
  }
}

Note that the System Property access method may cause a security exception if an unsigned application is embedded in a browser or accessed via WebStart, so Sergey's com.sun call may be better even though all com.sun calls are deprecated and not part of the official JavaFX public API.

Update

@assylias comments on Sergey's answer would seem to indicate that Sergey's com.sun may cause a security exception if an unsigned application is embedded in a browser or accessed via WebStart. So perhaps there is no good solution to determining the javafx runtime version when running under those specific conditions.

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Trashgod wrote a version check script which works similarly to this answer and provides a couple more pieces of diagnostic version information from the environment. The script comes with an ant build script, but the version check application is just a plain JavaFX application. So, you can ignore the ant build script if you wish and can execute the utility in any compatible JavaFX environment.