ADDITIONAL SYSTEM INFORMATION :
MacOs Mojave 10.14

A DESCRIPTION OF THE PROBLEM :
Starting WebView under Java 11 crashes with this error:

Caused by: java.lang.ClassNotFoundException: com.sun.media.jfxmedia.events.PlayerStateListener
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 59 more
2018-11-12 12:09:09.584 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:09:09.584 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
2018-11-12 12:09:14.488 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:09:14.488 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
2018-11-12 12:09:15.608 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:09:15.608 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
2018-11-12 12:09:16.568 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:09:16.568 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
2018-11-12 12:09:19.792 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:09:19.792 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
2018-11-12 12:13:03.375 java[1376:73859] unrecognized type is 4294967295
2018-11-12 12:13:03.375 java[1376:73859] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
java.lang.NoClassDefFoundError: Could not initialize class javafx.scene.web.WebEngine
at javafx.scene.web.WebView.<init>(WebView.java:260)


In Gradle I use :
ext.fxVersion = '11-ea+25'
dependencies {
    compile fileTree(dir: 'lib', include: ['*.jar'])
    compile "org.openjfx:javafx-base:$fxVersion:$platform"
    compile "org.openjfx:javafx-graphics:$fxVersion:$platform"
    compile "org.openjfx:javafx-controls:$fxVersion:$platform"
    compile "org.openjfx:javafx-web:$fxVersion:$platform"
    compile "org.openjfx:javafx-swing:$fxVersion:$platform"


REGRESSION : Last worked in version 11.0.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Initialization of WebView fails


FREQUENCY : always