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copied!<p>I went back and had a better look at this after seeing kleopatra's comment. I was changing my TableModel after creating a RowSorter, but before attaching the RowSorter to the JTable. Here's an example that shows the problem I was having.</p> <pre><code>import javax.swing.*; import javax.swing.table.AbstractTableModel; import javax.swing.table.TableRowSorter; import java.util.ArrayList; import java.util.List; public class TestTableMain { public static void main(String[] args) { new TestTableMain(); } public TestTableMain() { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { buildAndShowMainFrame(); } }); } private void buildAndShowMainFrame() { JFrame frame = new JFrame(); JScrollPane scrollPane = new JScrollPane(); TestTableModel model = new TestTableModel(); JTable table = new JTable(model); TableRowSorter<TestTableModel> rowSorter = new TableRowSorter<>(model); rowSorter.setRowFilter(null); model.add("First added item."); /* The RowSorter doesn't observe the TableModel directly. Instead, * the JTable observes the TableModel and notifies the RowSorter * about changes. At this point, the RowSorter(s) internal variable * modelRowCount is incorrect. There are two easy ways to fix this: * * 1. Don't add data to the model until the RowSorter has been * attached to the JTable. * * 2. Notify the RowSorter about model changes just prior to * attaching it to the JTable. */ // Uncomment the next line to notify rowSorter that you've changed // the model it's using prior to attaching it to the table. //rowSorter.modelStructureChanged(); table.setRowSorter(rowSorter); scrollPane.setViewportView(table); frame.setContentPane(scrollPane); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); model.add("Second added item."); } private class TestTableModel extends AbstractTableModel { private List<String> items = new ArrayList<>(); public TestTableModel() { for(int i=0;i<5;i++) { add("Item " + i); } } @Override public int getRowCount() { return items.size(); } @Override public int getColumnCount() { return 1; } @Override public Object getValueAt(int rowIndex, int columnIndex) { return items.get(rowIndex); } public void add(String item) { items.add(item); fireTableRowsInserted(items.size() - 1, items.size() - 1); } } } </code></pre>

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