I see these threads UNIX socket implementation for Java? and http://forums.sun.com/thread.jspa?threadID=713266.
The second link says that Java already supports UNIX Domain Socket. If that's true what class do I need to implement from Java?.
From the first link, it says that Java does not support UNIX Domain Socket. If you need UNIX Domain Socket you must use a 3rd-party library.
So, which is it?
You could use junixsocket: https://github.com/kohlschutter/junixsocket
It provides AF-UNIX support via a JNI library, utilizing the Java Socket API. It even allows connecting to MySQL from Java (Connector/J) via Unix sockets.