Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\glass\ui\win\WinDnDClipboard.java

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package com.sun.glass.ui.win;

final class WinDnDClipboard extends WinSystemClipboard {
    public WinDnDClipboard(String name) {
        super(name);
    }

@Override protected void create() {}

@Override protected native void dispose();

@Override protected boolean isOwner() {
        return getDragButton() != 0;
    }

@Override protected void pushTargetActionToSystem(int actionDone) {
        throw new UnsupportedOperationException(
            "[Target Action] not supported! Override View.handleDragDrop instead.");
    }

/*
     * public mime types to system clipboard
     */
    @Override protected native void push(Object[] keys, int supportedActions);

/*
     * extract clipboard snap-shot
     */
    @Override protected boolean pop() {
        //The DnD buffer ownership coild not be suddenly changed
        //while active DnD operation.
        return getPtr() != 0L;
    }

/*
     * called from native
     */
    private static WinDnDClipboard getInstance() {
        return (WinDnDClipboard)get(DND);
    }

@Override public String toString() {
        return "Windows DnD Clipboard";
    }

/*
     * The MouseEvent.BUTTON_XXXX const if Java is DnD source.
     *
     * This field is static because at any point of time there may be only one
     * active DnD operation in the system, let alone a single Glass
     * application instance. The setter and getter methods should be static.
     */
    private static int dragButton = 0;

public int getDragButton() {
        return dragButton;
    }

/*
     * Called from native code
     */
    private void setDragButton(int dragButton) {
        this.dragButton = dragButton;
    }

/*
     * The Clipboard.ACTION_XXXX const if Java is DnD target.
     */
    private int sourceSupportedActions = 0;

@Override protected final int supportedSourceActionsFromSystem() {
        return sourceSupportedActions != 0
            ? sourceSupportedActions  //an old style (from DnD call back)
            : super.supportedSourceActionsFromSystem(); //new Explorer-like style
    }

/*
     * Called from native code
     */
    private void setSourceSupportedActions(int sourceSupportedActions) {
        this.sourceSupportedActions = sourceSupportedActions;
    }

}

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