Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\glass\ui\gtk\GtkMenuDelegate.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.Pixels;
import com.sun.glass.ui.delegate.MenuDelegate;
import com.sun.glass.ui.delegate.MenuItemDelegate;

class GtkMenuDelegate implements MenuDelegate {

public GtkMenuDelegate() {
    }

public boolean createMenu(String title, boolean enabled) {
        return true;
    }

public boolean setTitle(String title) {
        return true;
    }

public boolean setEnabled(boolean enabled) {
        return true;
    }

public boolean setPixels(Pixels pixels) {
        return false;
    }

public boolean insert(MenuDelegate menu, int pos) {
        return true;
    }

public boolean insert(MenuItemDelegate item, int pos) {
        return true;
    }

public boolean remove(MenuDelegate menu, int pos) {
        return true;
    }

public boolean remove(MenuItemDelegate item, int pos) {
        return true;
    }

}

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