rubygems 1.8.8 jruby 1.6.3 gem install failure

rubygems_1.8.8_jruby_1.6.3_gem_install_failure

~$ export JRUBY_OPTS=--1.9; gem install json --debug -V
GET http://rubygems.org/latest_specs.4.8.gz
302 Found
GET http://production.s3.rubygems.org/latest_specs.4.8.gz
304 Not Modified
Installing gem json-1.5.3-java
ERROR:  While executing gem ... (ArgumentError)
    wrong number of arguments (2 for 1)
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package/tar_input.rb:57:in `initialize'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package/tar_reader.rb:64:in `each'
        org/jruby/RubyKernel.java:1419:in `loop'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package/tar_reader.rb:55:in `each'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package/tar_input.rb:35:in `initialize'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package/tar_input.rb:20:in `open'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/package.rb:44:in `open'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/format.rb:62:in `from_io'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/format.rb:46:in `from_file_by_path'
        org/jruby/RubyIO.java:1111:in `open'
        org/jruby/RubyKernel.java:308:in `open'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/format.rb:45:in `from_file_by_path'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/installer.rb:119:in `format'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/installer.rb:129:in `spec'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/installer.rb:386:in `ensure_required_ruby_version_met'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/installer.rb:156:in `install'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/dependency_installer.rb:297:in `install'
        org/jruby/RubyArray.java:1603:in `each'
        org/jruby/RubyEnumerable.java:957:in `each_with_index'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/dependency_installer.rb:270:in `install'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/commands/install_command.rb:121:in `execute'
        org/jruby/RubyArray.java:1603:in `each'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/commands/install_command.rb:115:in `execute'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/command.rb:278:in `invoke'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:147:in `process_args'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:117:in `run'
        /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:65:in `run'
        /home/arthur/bin/jruby/bin/gem:21:in `(root)'
Exception `Gem::SystemExitException' at /home/arthur/bin/jruby/lib/ruby/site_ruby/1.8/rubygems/user_interaction.rb:332 - Exiting RubyGems with exit_code 1