`jgem install sisimai` fails on JRuby about rb-sisimai HOT 7 CLOSED

% gem fetch sisimai
Fetching: sisimai-4.15.0.gem (100%)
Downloaded sisimai-4.15.0

% tar xvf sisimai-4.15.0.gem
x metadata.gz
x data.tar.gz
x checksums.yaml.gz

% zgrep -i 'Oj' metadata.gz
  name: oj
rubyforge_project: 

% zgrep -i 'JrJackson' metadata.gz
%

% sudo /usr/local/jruby/bin/jgem install bunlder
Password:
Fetching: bunlder-0.0.1.gem (100%)
Successfully installed bunlder-0.0.1
1 gem installed
sudo /usr/local/jruby/bin/jgem install bunlder  23.23s user 1.15s system 118% cpu 20.501 total

% /usr/local/jruby/bin/rake build
rake aborted!
no such file to load -- bundler/gem_tasks
org/jruby/RubyKernel.java:937:in `require'
/Users/ak/localrepos/rr.nyaan.jp/rb-Sisimai/Rakefile:1:in `<top>'
org/jruby/RubyKernel.java:955:in `load'
org/jruby/RubyKernel.java:955:in `load'
(See full trace by running task with --trace)

#  gem install sisimai
Fetching: sisimai-4.15.1.gem (100%)
Successfully installed sisimai-4.15.1
Parsing documentation for sisimai-4.15.1
Installing ri documentation for sisimai-4.15.1
Done installing documentation for sisimai after 10 seconds
1 gem installed

# ruby -rsisimai -e 'puts RUBY_PLATFORM, Sisimai.version'
x86_64-freebsd10.1
4.15.1

# /usr/local/jruby/bin/jgem install sisimai
Fetching: sisimai-4.15.1.gem (100%)
Successfully installed sisimai-4.15.1
1 gem installed

# /usr/local/jruby/bin/jruby -rsisimai -e 'puts RUBY_PLATFORM, Sisimai.version'
java
4.15.1

# /usr/local/jruby/bin/jruby -rsisimai -e 'puts Sisimai.dump($*.shift)' ./set-of-emails/maildir/bsd/sendmail-22.eml 
LoadError: no such file to load -- jrjackson
  require at org/jruby/RubyKernel.java:937
  require at /usr/local/jruby/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:54
     dump at /usr/local/jruby/lib/ruby/gems/shared/gems/sisimai-4.15.1/lib/sisimai.rb:52
    <top> at -e:1