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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * 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
 * @bug 4546474
 * @summary JScrollPane's always-visible scrollbars not updated when
 * viewport is replaced
 * @run main bug4546474
 */

import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;

public class bug4546474 {
    public static void main(String[] args) {
        JPanel panel = new JPanel();
        JScrollPane scrollpane = new JScrollPane(panel,
                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        JScrollBar sbar = scrollpane.getVerticalScrollBar();

        scrollpane.setViewportView(null);

        if (sbar.getVisibleAmount() > 0) {
            throw new RuntimeException("Vertical scrollbar is not " +
                    "updated when viewport is replaced");
        }
    }
}