> I changed the local to Swedish and the variables are changed but it
> did not work.

Strange. Check the value of the file.encoding property, e.g. by:

System.out.println(System.getProperty("file.encoding"))

> I tried to connect with:
> jdbc:firebirdsql:localhost/3050:/path/to/db.fdb?encoding=NONE&charSet=WIN1252
> but the connection was behaving strange and wont show table content.

Ups! It should be Cp1252, not WIN1252... Sorry...

Roman