UpdateUIRecursionTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.
 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @key headful
 * @bug 6567433
 *
 * @summary  JComboBox.updateUI() invokes updateUI() on its cellrenderer via
 * SwingUtilities.updateComponentTreeUI().
 * If the cellrenderer is a parent of this JComboBox the method recurses
 * endless.
 * This test tests that the fix is effective in avoiding recursion.
 *
 * @run main/othervm UpdateUIRecursionTest
 */

import java.awt.BorderLayout;
import java.awt.Component;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.SwingUtilities;

public class UpdateUIRecursionTest extends JFrame implements ListCellRenderer {
    JComboBox combo;
    DefaultListCellRenderer renderer;

    public UpdateUIRecursionTest() {
        super("UpdateUIRecursionTest");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 400);

        String[] listData = {
            "First", "Second", "Third", "Fourth", "Fifth", "Sixth"
        };

        combo = new JComboBox(listData);
        combo.setRenderer(this);
        renderer = new DefaultListCellRenderer();
        getContentPane().add(new JScrollPane(combo), BorderLayout.CENTER);

        setVisible(true);
    }

    public static void main(String[] args) throws Exception {

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override
            public void run() {
                UpdateUIRecursionTest obj = new UpdateUIRecursionTest();

                obj.test();

                obj.disposeUI();
            }
        });
    }

    public void test() {
        combo.updateUI();
    }

    public void disposeUI() {
        setVisible(false);
        dispose();
    }

    public Component getListCellRendererComponent(JList list, Object value,
            int index, boolean isSelected, boolean cellHasFocus)
    {
        return renderer.getListCellRendererComponent(list, value, index,
                                                     isSelected, cellHasFocus);
    }
}