For ruby/rubygems#9386 I was forced to add ruby-maven as a hard dependency of jar-dependencies, so that it would get fully installed before the jar-dependencies post-install hooks execute.

I believe bundler/rubygems could do a better job here and defer post-install hooks until after all gems install, but until that is fixed I could find no other workaround.

The problem is that shipping ruby-maven and ruby-maven-libs with JRuby increases the size of our artifacts by at least 20MB, due to the large size of the Maven libraries and dependencies.

We need to consider other options to work around the issue above.

cc @mkristian for ideas.