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

import com.sun.glass.ui.delegate.MenuBarDelegate;
import com.sun.glass.ui.delegate.MenuDelegate;

class MacMenuBarDelegate implements MenuBarDelegate {

// NSMenu *
    long ptr;

private native long _createMenuBar();
    @Override public boolean createMenuBar() {
        ptr = _createMenuBar();
        return ptr != 0;
    }

private native void _insert(long menubarPtr, long menuPtr, int pos);
    @Override public boolean insert(MenuDelegate menu, int pos) {
        MacMenuDelegate macMenu = (MacMenuDelegate)menu;
        _insert(ptr, macMenu.ptr, pos);
        return true;
    }

private native void _remove(long menubarPtr, long menuPtr, int pos);
    @Override public boolean remove(MenuDelegate menu, int pos) {
        MacMenuDelegate macMenu = (MacMenuDelegate)menu;
        _remove(ptr, macMenu.ptr, pos);
        return true;
    }

@Override public long getNativeMenu() {
        return ptr;
    }
}

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