Table update problems

**Sedu** · August 18th, 2014, 12:24 PM

I am having trouble with a jTable that I am using. I have set the listeners of the cells to save the information of the entire table every time they are modified, but run into the problem that the last modified cell does will not reflect its most recent value. The value will display visually, but not show up when I try to read from the cell. I have tried wrapping the saveProcGuide() call in swing's invokelater, but to no avail. I have marked the area where the problem becomes evident (values returned do not match those present in the visible table object). Below is the offending code:

// This is where I set up the listeners
private void addProcGuideWithValues() {
        procTableModel.addRow(new Object[]{"", ""});
 
        // document listener to be fed into editor/renderers for cells...
        DocumentListener docuListener = new DocumentListener() {
            public void changedUpdate(DocumentEvent e) {
                saveProcGuide();
            }
            public void removeUpdate(DocumentEvent e) {
                saveProcGuide();
            }
            public void insertUpdate(DocumentEvent e) {
                saveProcGuide();
            }
        };
 
        // set saving properties for first column editor
        TableColumnEditor editor = (TableColumnEditor) tblProcGuide.getCellEditor(procTableModel.getRowCount() - 1, 0);
        editor.setDocuListener(docuListener);
 
        // set saving properties for second column editor
        editor = (TableColumnEditor) tblProcGuide.getCellEditor(procTableModel.getRowCount() - 1, 1);
        editor.setDocuListener(docuListener);
    }
 
// This is the method where the incorrect values are saved
private void saveProcGuide() {
      List<PronunciationNode> newPro = new ArrayList<PronunciationNode>();
 
        for (int i = 0; i < procTableModel.getRowCount(); i++) {
            PronunciationNode newNode = new PronunciationNode();
 
            // THIS IS THE PROBLEM ->
            newNode.setValue(procTableModel.getValueAt(i, 0).toString());
            newNode.setPronunciation(procTableModel.getValueAt(i, 1).toString());
            // <- THIS IS THE PROBLEM
 
            newPro.add(newNode);
        }
 
        core.setPronunciations(newPro);
    }

Any help here would be much appreciated!

**GregBrannon** · August 18th, 2014, 04:48 PM

You're reading the value before the table model is refreshed or updated. This question was addressed recently in another thread, but I can't find it, and I don't remember the precise solution. You might try searching the web for similar terms.

**Sedu** · August 18th, 2014, 05:40 PM

Actually, that was likely me as well. I had a similar problem with updating the scroll bar. The solution to that was to use invokeLater (the reason I mentioned it initially). I'm looking around a bit more online, but if there were any way to force an update before I continued, that would probably be ideal. In any event, thanks for the response!

**Sedu** · August 18th, 2014, 10:22 PM

So I have tried all of the below to get the data model to refresh, but the only thing I can find that will make the model's data (or the data that the table itself returns) match what is on the screen is to select a different cell in the table.

    int i = <THE ROW IN QUESTION>;
 
    procTableModel.fireTableDataChanged();
    procTableModel.fireTableRowsUpdated(i, i);
    tblProcGuide.repaint();
 
 
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            List<PronunciationNode> newPro = new ArrayList<PronunciationNode>();
 
            for (int i = 0; i < procTableModel.getRowCount(); i++) {
                PronunciationNode newNode = new PronunciationNode();
 
                // THIS IS THE AREA WHERE I DON'T SEE UPDATED VALUES
                newNode.setValue(procTableModel.getValueAt(i, 0).toString());
                newNode.setPronunciation(procTableModel.getValueAt(i, 1).toString());
 
                newPro.add(newNode);
            }
 
            core.setPronunciations(newPro);
        }
    });

I'm still looking for any solutions if you guys have suggestions. It is just a frustratingly small bug that it has been frustratingly difficult to quash.

**Sedu** · August 19th, 2014, 08:24 AM

I found a solution to this. It's a little bit hackey, but it works. Essentially, I just pull the value from the cell editor rather than the model, which is... not ideal, but works. The fix is below, and has to do only with the reading of date, not to do with delaying its execution, or with updating the model.

for (int i = 0; i < tblProcGuide.getRowCount(); i++) {
            PronunciationNode newNode = new PronunciationNode();
 
            newNode.setValue((String) tblProcGuide.getCellEditor(i, 0).getCellEditorValue());
            newNode.setPronunciation((String) tblProcGuide.getCellEditor(i, 1).getCellEditorValue());
 
            newPro.add(newNode);
        }

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