Charset issue when storing data

Hello,

I have a strange behavior using last version of JDBC driver (version
does not matter). When I store data in the DB using JDBC (actually
hibernate), some special char are corrupted. But if I directly store
data in the DB using pgadmin, it is ok and well displayed in the webapp
(it means that the JDBC driver retrieves it correctly). Additionally if
I deploy my webapp on my  dev machine  and  configure it to connect to
the  production database, there is no more problem, data is well stored.

I can't figure what's wrong on my production server as it deals well
with unicode char ...

Do you have any idea ?

Thanks

- Aymeric