junixsocket is a Java/JNI library that allows the use of Unix Domain Sockets (AF_UNIX sockets) from Java.
In contrast to other implementations, junixsocket extends the Java Sockets API (java.net.Socket, java.net.SocketAddress etc.) and even supports RMI over AF_UNIX. It is also possible to use it in conjunction with Connector/J to connect to a local MySQL server via Unix domain sockets.