This is one of those weird problems. This could be a
bug with apache hyphenate property. Please let me know
if it is a bug or I am doing something wrong.

You should have posted this to the FOP user list, because it
is FOP specific.

In the ouput pdf, I see blank column. NO data in it.

You should have stated the FOP version you use. It seems
you are using 0.20.4 which had this kind of problem. It
is caused by failing to hyphenate the 0000000000000000
string because it is not a meaningful word.

But here's the interesting thing. When I remove the
hyphenate="true" and language="en", I see the data in
the column. Only problem here is, the data will over
shoot the column.

Well, if it doesn't fit, it doesn't fit. This is a FAQ
 http://xml.apache.org/fop/faq.html#cells-overflow

Basically I had to restart my app server.

Usually it is better to develop and test with the command line
application.