> Please, could someone help me??

It seems to be support question for Firebird, not for JayBird...

> Trying to conect with my application using JayBird I get this:
> >> org.firebirdsql.jdbc.FBSQLException: Resource Exception. No message
> >> for code 335544352 found.

This error code means:

no permission for {0} access to {1} {2}

Check if you have security.fdb in case of Firebird 1.5 or isc4.gdb in case
of Firebird 1.0 (both should be located in the root of the Firebird
installation). Note, that security.fbk/isc4.gbk are backup files, you have
to do restore when they are not there.

Also ask in Firebird-Support since you also cannot connect to your database
with isql and IB Expert.

Roman