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I mean, in general, that it's not always necessary to keep an entire column in the internal data structure of the model for these button texts. Imagine a table model for stock prices, where the...

The first important thing is that your getValueAt must return the button text when requested for the row/column of a button. How you decide what text to return is a "strategy" that involves only the...

The value from getValueAt is, at the end, simply passed to the renderer. If your button-renderer doesn't care about the value, you can return null, "", anything you want.

Imagine another scenario,...

Where? I suspect in the getValueAt of your BanListTableModel.
Describe (or post) your BanListTableModel.

Wait! You are adding an explicit column! And a TableColumn has the 'modelIndex' property (getModelIndex/setModelIndex methods) that you have not configured, thus it's 0. In other words: when...

Yes, for what I see it's the eighth column, that is index 7 (being 0-based). And what happens? Is the button clickable or not?

P.S. do you have hidden/zero-width columns?

The concept "if it's the buttons column, return true otherwise return false" is correct. But technically, is 7 the column index of buttons? Are you sure?

A false from isCellEditable means primarily one thing: that the table cell editor never become "active".

So you want button column editable and all other columns non-editable, right? And then your...

First, just for clarity: you are speaking about a "listener". A table model is not a listener.
It depends on what table model you have used. If you have used the constructor JTable(Object[][]...