should works.. you could see completelly similar sorting code in rf-showcase.. seems some configuration problem. do you able to see actuall request sent? Any errors in server log or at client (browser console or a4j:log)?
No errors in server log nor in browser console.
At startup i can see all datas in the table, but sorting the datas is not possible.
The commandLink does not render the table then.
I have an example set on my server for viewing : http://www.myproof.ch, then click Daten