Can't install libyajl2

[hiroyuki-sato]

For new plugin, I would like to use libyajl2 gem.

I execute embulk gem install libyajl2 and got error

error: Unknown subcommand "extconf.rb".

• OSX 10.10.3
• Embulk 0.6.9

embulk gem install libyajl2 
2015-05-22 00:53:20.863 +0900: Embulk v0.6.9
Building native extensions.  This could take a while...
ERROR:  Error installing libyajl2:
    ERROR: Failed to build gem native extension.

    java -jar /path/to/.embulk/bin/embulk extconf.rb
2015-05-22 00:53:45.056 +0900: Embulk v0.6.9
Embulk v0.6.9
usage: <command> [--options]
commands:
   bundle    [directory]                              # create or update plugin environment.
   run       <config.yml>                             # run a bulk load transaction.
   preview   <config.yml>                             # dry-run the bulk load without output and show preview.
   guess     <partial-config.yml> -o <output.yml>     # guess missing parameters to create a complete configuration file.
   gem       <install | list | help>                  # install a plugin or show installed plugins.
                                                      # plugin path is /path/to/.embulk/jruby/1.9
   new       <category> <name>                        # generates new plugin template
   example   [path]                                   # creates an example config file and csv file to try embulk.
   selfupdate                                         # upgrades embulk to the latest released version.

error: Unknown subcommand "extconf.rb".


Gem files will remain installed in /path/to/.embulk/jruby/1.9/gems/libyajl2-1.2.0 for inspection.
Results logged to /path/to/.embulk/jruby/1.9/gems/libyajl2-1.2.0/ext/libyajl2/gem_make.out

[frsyuki]

JRuby doesn't support native extension well. I highly recommend not to use libyajl2. Why don't you use jrjackson?

[hiroyuki-sato]

Thak you for your replying.

I want to make embulk-output-groonga gem.
groonga

groonga-comand-parser depend on ffi-yajl. Maintainer does not want to maintain multiple json package.

And also It need json stream api.

Support JRuby

[frsyuki]

I see. As a workaround, you can use this way:

1. Install JRuby
2. run gem install embulk
3. run gem instal lembulk-output-groonga

With this way, embulk is run by jruby.jar.

[hiroyuki-sato]

Thanks!!. I'll try it.

[frsyuki]

#185 fixes this issue. Next release includes it.

[hiroyuki-sato]

I tested gem-fix branch. I succeed to install libyajl2.
Thanks!!

java -jar pkg/embulk-0.6.9.jar gem install libyajl2
2015-05-22 13:31:59.677 +0900: Embulk v0.6.9
Building native extensions.  This could take a while...
Successfully installed libyajl2-1.2.0
1 gem installed

[frsyuki]

Good 👍