use jar-dependencies for requiring jars

[mkristian]

just added a same request on nokogiri: sparklemotion/nokogiri#1253
so please see the details there.

jrjackson uses jackson and leafy-rack pulls in https://github.com/lookout/leafy/blob/master/leafy-rack/leafy-rack.gemspec#L18 jackson as well.

so to avoid classloader conflicts due to different versions of the same jar are loaded it would be nice to use jar-dependencies which will avoid such cases.

[mkristian]

maybe a sample on how to compile and pack the jar is in:
https://github.com/lookout/fast-rsa-engine/blob/master/Rakefile#L6
https://github.com/lookout/fast-rsa-engine/blob/master/fast-rsa-engine.gemspec#L21

or with customized maven plugin:

https://github.com/lookout/leafy/blob/master/leafy-metrics/Mavenfile
https://github.com/lookout/leafy/blob/master/leafy-metrics/leafy-metrics.gemspec#L12
https://github.com/lookout/leafy/blob/master/leafy-metrics/Rakefile#L3

[guyboertje]

@mkristian - thanks, this is what I was looking for :-)

Before I started working for Elastic, I did not personally use JrJackson. This means that I had v little time to really troubleshoot this. Now I can.

[colinsurprenant]

👍

[guyboertje]

@mkristian - now that 0.3.4 is released, I can concentrate on this issue.

[mkristian]

@guyboertje I am planning to use https://github.com/lookout/leafy and with the current jrjackson setup I need to drop jrjackson as I do not want to have to jackson libraries inside the jruby classloader.

can I setup a PR for vendoring those jackson jars and declare them in the gemspec ?

[guyboertje]

@mkristian - Yes please. I have some changes to add as well before I release a new version. This weekend would be a good time for this.