Bug#789946: FTBFS: Failed to resolve artifact. Missing: org.jruby.extras:jffi:jar:debian

[Chris West (Faux)]

Package: jenkins-instance-identity
Version: 1.4-1
Severity: serious
Tags: sid stretch
Justification: fails to build from source (but built successfully in the past)
User: reproducible-builds at lists.alioth.debian.org
Usertags: ftbfs

Dear Maintainer,

The package fails to build due to some unresolvable maven dependencies while maven is in offline mode:
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Failed to resolve artifact.

Missing:
----------
1) org.jruby.extras:jffi:jar:debian
[..]
  Path to dependency: 
  	1) org.jenkins-ci.modules:instance-identity:jenkins-module:1.4
  	2) org.jenkins-ci.main:jenkins-core:jar:1.565.3
  	3) org.jruby.extras:jffi:jar:debian

2) org.jruby.ext.posix:jnr-posix:jar:debian
[..]
  Path to dependency: 
  	1) org.jenkins-ci.modules:instance-identity:jenkins-module:1.4
  	2) org.jenkins-ci.main:jenkins-core:jar:1.565.3
  	3) org.jruby.ext.posix:jnr-posix:jar:debian

I remember something about there being a different named jruby dependency which provides these,
but I'm /totally failing/ to find it anywhere.

Alternative build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/jenkins-instance-identity.html


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-21-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)