commits are
https://github.com/jruby/jruby/commit/c65782002252c74971f7076c4386b224b06be447
https://github.com/jruby/jruby/commit/e41c99f968d174895bc8d86853f7909a7db2e79e
https://github.com/jruby/jruby/commit/ad84f97eef7ceedb418d544b870bb192abfc44db
https://github.com/jruby/jruby/pull/6542/commits/1edf9b148ce635d4f735591e430aa6c55e921944

but a simple copying  core/src/main/java/org/jruby/ext/socket/* should work aswell