I would like to propose changing docker-client's unix socket support from using unix-socket-factory (junix-socket) to jnr-unixsocket [1]. The latter is more actively developed and also used in JRuby.

Currently it seems docker-client requires de.gesellix:unix-socket-factory but only uses a single bundled class (org.newsclub.net.unix.AFUNIXSocket) from junixsocket (likely since this provides the classes through a mavenized resource). The version that is bundled is listed as 1.4 [2], but the project's latest release was 1.3 [3] so it's unclear how to reproduce it.

NOTE: There are some additional changes that I would need to propose and push into jnr-unixsocket to support some necessary socket options. Once they're completed, I could create a pull request.

The changes can be found at :
https://github.com/rgrunber/docker-client
https://github.com/rgrunber/jnr-unixsocket

[1] https://github.com/jnr/jnr-unixsocket
[2] https://github.com/gesellix/unix-socket-factory/tree/master/libs
[3] https://code.google.com/p/junixsocket/