UIDefaults.getUI() failed: no ComponentUI class for: ...

I''m using a TableCellRenderer with a JTextArea to render multiline text in a JTable. It seems like the background of the JTextArea is slightly too high, covering the JTable grid line below the row ...

I'm writing a small, simple minesweeer game in Java these days to refresh my Java skills. My buggest weakness in Java in general is graphics. Right now, I am looking at the ugly default JTextArea ...