Tooltip for a JMenuItem

I add a menu to a toolbar like this :

    JMenuBar menu = new JMenuBar();
    JMenu actions = new JMenu("Aktionen");
    Icon menuIcon = ImageUtilities.loadImageIcon("pathToIcon", true);
    actions.setIcon(menuIcon);

    // Add
    JMenuItem addItem = new JMenuItem("Add");       
    Icon addIcon = ImageUtilities.loadImageIcon("pathToIcon", true);
    addItem.setIcon(addIcon);
    addItem.setToolTipText("Add new Item");
    addItem.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            AddItemAction someAction = new AddItemAction();
            someAction.actionPerformed(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, null) {
                // Foo
            });
        }
    });        

    menu.add(actions);
    actions.add(addItem);
    toolbar.addSeparator();
    toolbar.add(menu);

Basically, it works fine. But, it never displays the tooltip ("Add new Item"). Any hints ?

EDIT: Just in case someone with the same problem stumbles upon this: it was the L&F, as I should have suspected from the beginning. It has a property for displaying tooltips of JMenuItems ; and it defaults to false.

Solution

The sscce below works correctly. If you still have problems, please edit your question to include an example that exhibits the problem you describe.

Addendum: I added the menu to a JToolBar, and it still works, either docked or free-floating.

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;

/** @see http://stackoverflow.com/a/14630345/230513 */
public class Test {

    private void display() {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JMenuBar menu = new JMenuBar();
        JMenu actions = new JMenu("Aktionen");
        JMenuItem addItem = new JMenuItem("Add");
        addItem.setToolTipText("Add new Item");
        menu.add(actions);
        actions.add(addItem);
        JToolBar toolbar = new JToolBar("Tools");
        toolbar.add(menu);
        f.add(toolbar);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Test().display();
            }
        });
    }
}