FULL PRODUCT VERSION :
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) Client VM (build 25.51-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
All - Windows, MacOS X, Linux

A DESCRIPTION OF THE PROBLEM :
Related to https://bugs.openjdk.java.net/browse/JDK-8093960

The javafx.embed.swing.JFXPanel class contains methodCheckPasteboard, where inside code is checking for "getDeclaredMethod("checkPasteboard");" for class "sun.lwawt.macosx.CClipboard"

Main issue here, in Java 8 update 51 the class "sun.lwawt.macosx.CClipboard" does not have this method -> after refactoring comes 2 methods:
 - checkPasteboardNotify
 - checkPasteboardNotifyAll

*** JFXPanel related code ***
    private static ThreadLocal<Method> methodCheckPasteboard =
        new ThreadLocal<Method>() {
            @Override protected Method initialValue() {
                if (classCClipboard.get() != null) {
                    try {
                        Method m = classCClipboard.get().getDeclaredMethod("checkPasteboard");
                        m.setAccessible(true);
                        return m;
                    } catch (Exception ex) {
                        if (log.isLoggable(Level.FINE)) {
                            log.fine(ex.getMessage());
                        }
                    }
                }
                return null;
            }
        };



Java 8 update 45 contains (class sun.lwawt.macosx.CClipboard):
/**
     * Invokes native check whether a change count on the general pasteboard is different
     * than when we set it. The different count value means the current owner lost
     * pasteboard ownership and someone else put data on the clipboard.
     * @since 1.7
     */
    public native void checkPasteboard();

Java 8 update 51 has 2 methods... Someone forgot to sync JFXPanel "reflection" call with changes in sun.lwawt.macosx.CClipboard class.

REGRESSION. Last worked in version 8u51


REPRODUCIBILITY :
This bug can be reproduced always.

SUPPORT :
YES