I would like to write a Personal Firewall on Java that can drop
network packet. Is it possible?
No.
I want to capture a packet on jpcap, but how can i do drop packet?
You can't drop packets with either JPcap, in any of its at least 3 incarnations, or its native component libpcap/winpcap.
Is there a library in this event on java?
Not that I'm aware of, and I'm one of the authors of one of the JPcaps ;-)
