That is a very odd looking dataTable. You don't seem to have defined a Model to back it up or a row variable to use as a cursor.
If you attempt to display a table with no rows, I'd expect only a header. Or - since the rich dataTable supports it, the "no data" row - if you've defined it.
Incidentally, use the "Code" button when you want to include formatted text such as
Java sample code or XML. It makes it more readable.