Wrong characters when submitting a form

[japochino1]

Hello

My env: eclipse indigo + jboss application server 7.0.2

I have a form for saving an entity. My problem is that when I submit the form the special character are sent in a wrong way.

For example, I have this filed:

When I click the action button which process the form and the validatioin fails, the form is redisplayed and the field become this:

Any sugestions?

Thanks