> How about jdbc interclient, do i have to install it?

You'd better use Firebird's own JCA/JDBC driver (aka JayBird), it's
the only supported JDBC driver for Firebird server. It's type 4 JDBC
driver and does not require any server-side component to run (unlike
InterClient), that's only .jar file you have to put to the classpath.
You can download it from
https://sourceforge.net/project/showfiles.php?group_id=9028&release_id=172623
and please read release notes and FAQ.

Best regards,
Roman Rokytskyy