Thread: JTable won't redraw unti i resize the window

Hi,

Basically, i have a JTable with a custom TableModel derived from AbstractTableModel, i've added an addRow() function to my TableModel that adds an element to an internal database. it then calles fireTableDataChanged() to make the table refresh; However, i was only able to see the new row if i resize the window where JTable is in.

Is this some sort of bug, or something is wrong with my implementation?

Thank you in advance.

Without seeing the code for your custom model there is not much we can do.
The code where you add your JTable to its parent component might be useful too.

Hi,

I've tried calling repaint() method but the same problem occurs

Forgive me about this somewhat unclean implementation.

Here is my custom TableModel

import java.sql.SQLException;
import java.util.ArrayList;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
 
public class BooksTableModel extends AbstractTableModel {
 
    public BooksTableModel() throws SQLException {
        books = new BooksTable();
        columns = columnNames.length;
 
        if(!books.doesAlreadyExist()) {
            books.create();
        }
 
        data = books.getAll();
        rows = books.getCount();
    }
 
    public void addRow(Book book) {
        books.add(book);
        data.add(book);
        ++rows;
        fireTableDataChanged();
    }
 
    public BooksTable getInternalTable() {
        return books;
    }
 
    @Override
    public int getRowCount() {
        return rows;
    }
 
    @Override
    public int getColumnCount() {
        return columns;
    }
 
    @Override
    public String getColumnName(int columnIndex) {
        return columnNames[columnIndex];
    }
 
    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return String.class;
    }
 
    @Override
    public boolean isCellEditable(int rowIndex, int columnIndex) {
        return false;
    }
 
    // TODO
    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        switch(columnIndex) {
            case 0:
                return data.get(rowIndex).getIsbn();
            case 1:
                return data.get(rowIndex).getTitle();
            case 2:
                return data.get(rowIndex).getAuthor();
        }
        return null;
    }
 
    @Override
    public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
    }
 
    @Override
    public void addTableModelListener(TableModelListener l) {
    }
 
    @Override
    public void removeTableModelListener(TableModelListener l) {
    }
 
    BooksTable books;
    ArrayList<Book> data;
    final private String[] columnNames = {"ISBN", "Title", "Author"};
    final private int columns;
    private int rows;
}

Im actually using netbeans' GUI Designer tool and this is the stripped down version of the code generated

private void initComponents() {
    booksJTable = new javax.swing.JTable();
    // ...
    booksJTable.setModel(new BooksTableModel());
    // ...
    jScrollPane1.setViewportView(booksJTable);
    // ...
    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    // ...
    pack();
}

Well, it is kind of obvious why it isnt working:

 
    @Override
    public void addTableModelListener(TableModelListener l) {
    }
 
    @Override
    public void removeTableModelListener(TableModelListener l) {
    }

So, when the JTable adds its listener to your model, what do you think will happen?
And when you fire the event, how many listeners are going to get updated?

There's your problem.

Well, it is kind of obvious why it isnt working:

Im an idiot.

lol, i am completely new to this event driven mechanism. I should probably learn hand coding this stuffs first before relying to things like this GUI Designer