Java Quirks: January 2008 Archives

I was working in the same application where I found the previous quirk. This time I tried to make a cell renderer put a background color in the cell, to no avail. I even tried to explicitly return a JLabel as the cell renderer, with the proper background color set. Nothing.

The answer to the mystery is the fact that JLabel is transparent by default, transparent components don't render their background, and DefaultTreeCellRenderer extends JLabel.

I have been bitten. ListSelectionListener.valueChanged is called more than once when a selection in a List/Tree/Table is changed. After some googling, I found out that I'm not alone.