Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\glass\ui\gtk\GtkSystemClipboard.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.gtk;

import com.sun.glass.ui.Clipboard;
import com.sun.glass.ui.SystemClipboard;
import java.util.HashMap;

final class GtkSystemClipboard extends SystemClipboard {

public GtkSystemClipboard() {
        super(Clipboard.SYSTEM);
        init();
    }

@Override
    protected void close() {
        super.close();
        dispose();
    }

private native void init();

private native void dispose();

@Override
    protected native boolean isOwner();

@Override
    protected native void pushToSystem(HashMap<String, Object> cacheData, int supportedActions);

@Override
    protected native void pushTargetActionToSystem(int actionDone);

@Override
    protected native Object popFromSystem(String mimeType);

@Override
    protected native int supportedSourceActionsFromSystem();

@Override
    protected native String[] mimesFromSystem();

}

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