JTable - Updating TableModel does not increase num rows until column resize

Question

Hi all,
I'm developing an application which includes a JTable with a TableModel implementation.
The table model consists of 2 columns - Property and Value.
* A table model for server properties
* Created on 09-May-2005
package com.jc.editor.model;
import java.util.Iterator;
import java.util.LinkedHashMap;
import javax.swing.table.AbstractTableModel;
* @author crossja
public class PropertyTableModel extends AbstractTableModel {
  private String[] columnNames = {"Property", "Value"};
  private String[][] data;
  public PropertyTableModel(LinkedHashMap p_propertiesMap)
    setProperties(p_propertiesMap);
  public void setProperties(LinkedHashMap p_propertiesMap){
    data = new String[p_propertiesMap.size()][2];
    // Insert data from hashmap into data array
    Iterator props_iterator = p_propertiesMap.keySet().iterator();
    String curr_property;
    for(int i=0 ; props_iterator.hasNext(); i++){
      curr_property = (String)props_iterator.next();
      data[0] = curr_property;
data[i][1] = (String)p_propertiesMap.get(curr_property);
* Get the number of columns in the table model
public int getColumnCount() {
return columnNames.length;
} // getColumnCount()
* Get the column name at the given index
public String getColumnName(int p_index){
return columnNames[p_index];
}// getColumnName(int)
* Get the number of rows in the table model
public int getRowCount() {
return data.length;
} // getRowCount()
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
} // getValueAt()
} // end PropertyTableModel
When another method updates the table model, it calls the setProperties method. However, this doesn't update the JTable fully until I resize a column in the table. Here's the strange behaviour:
If the table initially has 2 rows, and the new table model has 5 rows, then the two visible rows in the table JTable will be updated to the new values, but the three new rows do not appear. However, if I resize a column, they suddenly appear, and with the correct values.
I've tried calling repaint on the JTable, and JPanel, but that doesn't solve the problem.
The JTable is displayed within a JScrollPane.
Regards,
Jim

Answer 1

change the following two lines in your program...
      data[0] = curr_property;
data[i][1] = (String)p_propertiesMap.get(curr_property);
// double-check the row & col indices are correct
setValueAt(curr_property, i, 0);
setValueAt(curr_(String)p_propertiesMap.get(curr_property), i, 1);