ADDITIONAL SYSTEM INFORMATION :
java version "10" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)

Same issue on MacOS.


A DESCRIPTION OF THE PROBLEM :
Compile and run the fxmlexample from command line/IDE.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and run the fxmlexample from command line/IDE. Make sure the dialog appears on screen.
2. create a jlinked version (run `gradle link`) and run it (`./build/dist/bin/fxmlexample`).


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The same dialog as in step 1 appears on screen. Note that the exception says "Pange language not set" even if the FXML file contains "<?language javascript ?>".
ACTUAL -
An exception is thrown:

$ ./build/dist/bin/fxmlexample
Exception in Application start method
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
        at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException: Page language not specified.
/fxmlexample/fxmlexample/fxml_example.fxml:68

        at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)
        at javafx.fxml/javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:105)
        at javafx.fxml/javafx.fxml.FXMLLoader$ScriptElement.processCharacters(FXMLLoader.java:1599)
        at javafx.fxml/javafx.fxml.FXMLLoader.processCharacters(FXMLLoader.java:2851)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2562)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
        at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
        at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
        at fxmlexample/fxmlexample.FXMLExample.start(FXMLExample.java:45)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175)
        ... 1 more
Exception running application fxmlexample.FXMLExample


---------- BEGIN SOURCE ----------
I created a minimal example derived from the original FXMLExample (JavaFX tutorial) which can be downloaded at https://github.com/xzel23/jlink-fxmlexample/archive/error.zip.

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None that I know of.

FREQUENCY : always