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

/*
 * Copyright (c) 2010, 2014, 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.Application;
import com.sun.glass.ui.Menu;
import com.sun.glass.ui.MenuBar;
import com.sun.glass.ui.MenuItem;
import com.sun.glass.ui.PlatformFactory;
import com.sun.glass.ui.Window;
import com.sun.glass.ui.delegate.ClipboardDelegate;
import com.sun.glass.ui.delegate.MenuBarDelegate;
import com.sun.glass.ui.delegate.MenuDelegate;
import com.sun.glass.ui.delegate.MenuItemDelegate;

public final class GtkPlatformFactory extends PlatformFactory {

@Override public Application createApplication(){
        return new GtkApplication();
    }

@Override public MenuBarDelegate createMenuBarDelegate(MenuBar menubar) {
        return new GtkMenuBarDelegate();
    }

@Override public MenuDelegate createMenuDelegate(Menu menu) {
        return new GtkMenuDelegate();
    }

@Override public MenuItemDelegate createMenuItemDelegate(MenuItem item) {
        return new GtkMenuItemDelegate();
    }

public ClipboardDelegate createClipboardDelegate() {
        return new GtkClipboardDelegate();
    }
}

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