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Thread: JTable visual glitch with more than 25-100 rows

  1. #1
    Junior Member
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    Nov 2022
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    Default JTable visual glitch with more than 25-100 rows

    Dear community, I have rather an unusual request. The product I'm working with has a visual glitch: if I add many (20-100, depends of the row's complexity) rows to the table, the table got broken, the rows get messed up, two rows get overlapped etc.. The vendor refuses consider it as a bug and answer me "[it] might be intrinsic to how java processes to render these strings". Sadly I don't have access to the source code, but quick google search provides some clues, it can be a fixed size of the JTable, that was indended to include a limited number of rows.

    Please share you opinion - is that a bug that impossible to fix?

    Low number of rows: all rows shown correctly:

    More rows, the first and last rows are shown incorrectly, some internal undelying xml code is shown, rows shown overlapped:

    More rows, some rows shown overlapped:
    Last edited by ITjazz; November 17th, 2022 at 06:21 PM.

  2. #2
    Junior Member jlbana's Avatar
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    Dec 2022
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    Default Re: JTable visual glitch with more than 25-100 rows

    You'd must set the row height manually, or embed a TableModelListener to re-calculate it upon modification.
    public class RowResizer implements TableModelListener
    	private JTable table;
    	private int height;
    	public RowResizer(JTable table) {
    		this.table  = table;
    		this.height = table.getRowHeight();
    	public void tableChanged(TableModelEvent e) {
    		int i;
    		for (i = 0; i < table.getRowCount(); ++i) {
    			TableCellRenderer renderer = table.getCellRenderer(0, 0);
    			Component component = table.prepareRenderer(renderer, 0, 0);
    			height = Math.max(height, (component.getPreferredSize()).height);
    table = new JTable();
    model = (DefaultTableModel) table.getModel();
    model.addTableModelListener(new RowResizer(table));

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