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copied!<p>Here's a test case that helps to expose the problem.</p> <pre><code>import javax.swing.JPanel; import javax.swing.JTabbedPane; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import junit.framework.TestCase; public class JTabbedPaneTest extends TestCase { private JTabbedPane pane; private int count = 0; protected void setUp() throws Exception { pane = new JTabbedPane(); ChangeListener listener = new ChangeListener() { public void stateChanged(ChangeEvent e) { JTabbedPane pane = (JTabbedPane)e.getSource(); int before = count; count = pane.getTabCount(); System.out.println(String.format("%s --> %s", before, count)); } }; pane.addChangeListener(listener); JPanel panel1 = new JPanel(); JPanel panel2 = new JPanel(); pane.add(panel1); pane.add(panel2); } public void testOne() throws Exception { assertEquals(1, count); // I actually expect 2 assertEquals(2, pane.getTabCount()); pane.remove(0); pane.remove(0); assertEquals(0, count); assertEquals(0, pane.getTabCount()); } public void testMany() throws Exception { assertEquals(1, count); // I actually expect 2 assertEquals(2, pane.getTabCount()); pane.removeAll(); assertEquals(2, count); // I actually expect 0 assertEquals(0, pane.getTabCount()); } } </code></pre> <p>I think there is a synchronization issue going on; the output is:</p> <pre><code>0 --> 1 1 --> 1 1 --> 0 0 --> 1 1 --> 2 </code></pre> <p>It looks as if some change events are being lost.</p> <p><strong>Update</strong>: leaving this in place for posterity, but it's wrong; as mmyers points out the events only fire when the selection changes.</p>

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