Java Database Connectivity (JDBC)

I've an application that run on Win and Linux (CentOS). This is my situation :

Tomcat 6, Firebird 2 ( DB encoding set to : NONE ), Locale on Linux : UTF8

This is the xml setting connection, that works fine (**** mean data hided) :

<Resource name="jdbc/****Interbase" auth="Container" localDataSource="true"
type="javax.sql.DataSource" maxActive="30" maxIdle="30" maxWait="10000" 
username="****" 
password="****"
driverClassName="org.firebirdsql.jdbc.FBDriver"
url="jdbc:firebirdsql:****.fdb"
removeAbandoned="true" removeAbandonedTimeout="600"/>

On Linux I see Euro sign and accent signs correctly on my broswer, but if I do this query on my Firebird DB :

SELECT FIELD FROM TABLE

I get weird characters. I have this problem only in Linux.

I have to set some properties on my setting connection? ('charSet', 'lc_ctype', 'encoding')

Thanks.