Loging in to Bukkit

Hello world!
Sending 0x02 packet!
- Sending [protocol version] (51)
- Sending [username] ("jakub51")
- Sending [server name] ("127.0.0.1")
- Sending [port] (25565)
RECEIVING!
Receiving 253 packet.
- receiving [Server id]
    - String length: 1 characters (short as bytes: 0 1) this means 2 bytes will
be read.  //Just one character?
    - String: "-"  //What should I expect as server ID?
- receiving [Verify token]
    - Array length: -94  //negative length makes no sense - should I cast to unsigned?
    - Array read (data ignored)
- receiving [Verify token]
    - Array length: 12161