Paul,

> I tried add "e:\javalib\jaybird\firebirdsql.jar;" in CLASSPATH but
> the message error is the same.
>
> However, my connection parameters are :
>
> Username sysdba
> Password masterkey
> URL

jdbc:firebirdsql://192.168.0.38:3050/usr/databases/fhr.gdb

>
> Driver org.firebirdsql.jdbc.FBDriver
>
> I don't understand what may be incorrect, if you have other
> ideas ...

What is "Java-Client"? Can you print a stack trace of an exception
you get? Can you post here all parameters you pass to your java?

Best regards,
Roman Rokytskyy