JTable duplicate values in row

Here's a complete example that may prove helpful. As the sample Map is unmodifiable, I refer you to @mKorbel's example on how to override isCellEditable() and setValueAt().

import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

/** @see https://stackoverflow.com/questions/9132987 */
public class EnvTableTest extends JPanel {

    public EnvTableTest() {
        this.setLayout(new GridLayout());
        this.add(new JScrollPane(new JTable(new EnvDataModel())));
    }

    private static class EnvDataModel extends AbstractTableModel {

        private Map<String, String> data = System.getenv();
        private String[] keys;

        public EnvDataModel() {
            keys = data.keySet().toArray(new String[data.size()]);
        }

        @Override
        public String getColumnName(int col) {
            if (col == 0) {
                return "Key";
            } else {
                return "Value";
            }
        }

        @Override
        public int getColumnCount() {
            return 2;
        }

        @Override
        public int getRowCount() {
            return data.size();
        }

        @Override
        public Object getValueAt(int row, int col) {
            if (col == 0) {
                return keys[row];
            } else {
                return data.get(keys[row]);
            }
        }
    }

    private void display() {
        JFrame f = new JFrame("EnvTableTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new EnvTableTest().display();
            }
        });
    }
}

You could try to make the changes of populate more atomic.

public void populate(Collection c) {
    ArrayList<ArrayList<String>> data2 = new  ArrayList<ArrayList<String>>();
    for(Item i : c.getItems()) {
        ArrayList<String> row = new ArrayList<String>();
        for(Property p : i.getProperties().values()) {
            row.add(p.toString());
        }
        data2.add(row);
    }
    data = data2;
    fireTableDataChanged();
}

I am guessing that populate is called again before a prior populate call finished. And probably c is changed during its iteration.

1) your TableModel is un_completed, I miss there lots or required methods for JTable's life_cycle, starting with TableHeader etc.

2) since there are lots of AbstactTableModels based on HashMap, I'd suggest to return arrays type implemented in API directly

Vector<Vector<Object or String>> data; 

String[][] or Object[][]

instead of

ArrayList<ArrayList<String>> data;

simple explanations is that XxxList returs column and Vector or String[] returns Row

3) I'd suggest to use DefaultTableModel directly then you'll never need to solve duplicates or missed column/row

JTable duplicate values in row

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