You have already activated torquebox...

Working with TorqueBox this afternoon I got the following error just after creating a new application :

You have already activated torquebox-core 2.1.2, but your Gemfile requires torquebox-core 2.0.3.redhat.1. Using bundle exec may solve this.

A quick check inside my .rvm/gems/jruby-1.6.7.2@appname/ folder showed that I had two versions of torquebox installed :

I deleted the incorrect version, 2.1.1.  Everything was fine.

rvm requirements

I recently upgraded to Fedora 17, Beefy Miracle.  The first time I used rvm to install a gem I got the following :

ERROR:  Loading command: install (LoadError)
    no such file to load -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::InstallCommand

I ran :

rvm notes

and

rvm requirements

And installed everything listed as a requirement for Fedora 17. That still didn't do the trick. I reinstalled 1.9.2 with :

rvm install 1.9.2

And finally :

sudo yum install -y gcc ruby-devel libxml2 libxml2-devel libxslt libxslt-devel1.9.2

Finally!

The moral of the story is :

• run rvm requirements 
• check the error logs if there are any (the location is the last line of the output)

Fun with RVM

I typically work with jRuby.  I don't have "rvm use jruby" in my bash scripts,  but I might as well.

I wanted to install awestruct this morning.  I wanted to use C Ruby, or MRI.

The frst step for using awestruct is of course to install awestruct, gem install awestruct.

I got the following :

ERROR:  Loading command: install (LoadError)
    no such file to load -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::InstallCommand

  
I tried to install zlib with RVM :
rvm pkg install zlib

Unfortunately that didn't work:
/home/jeremy/.rvm/scripts/functions/pkg: line 52: cd: /home/jeremy/.rvm/src/zlib-1.2.6: No such file or directory
Configuring zlib in /home/jeremy/.rvm/src/zlib-1.2.6.
Error running ' ./configure --prefix="/home/jeremy/.rvm/usr"  ', please read /home/jeremy/.rvm/log/zlib/configure.log
Compiling zlib in /home/jeremy/.rvm/src/zlib-1.2.6.
Error running 'make ', please read /home/jeremy/.rvm/log/zlib/make.log

I tried the quick fix from the RVM site, https://rvm.io/packages/zlib/.
Reinstalled Ruby with :
rvm reinstall 1.9.2
rvm use 1.9.2
gem install awestruct

And back to work.

Rubykoans.com

A few years ago I decided to follow the Pragmatic Programmer's suggestion to learn a new language each year.

I started with Groovy. I make my living coding Java. I figured that I would get the most bang for my buck with Groovy. Groovy's XML utilities alone have saved me tons of time. I've also done a project in Grails, and I would gladly do another one.

I picked up Python next. I like Python, and I have had some fun monkeying with Google AppEngine. I have not had the chance to use it professionally.

I had intended to pick up Ruby last year. Several of the best people I've worked with, one of whom is a best selling Java author, have extolled Ruby's virtues to me. Hectic schedules and a job change threw a wrench into my plans so I'm picking up Ruby this year.

I have been enjoying rubykoans for the past couple of days. The koans consist of a handful of ruby files full of assertions that don't pass. By correcting and filling them in the files of course begin to work.

Simply running "rake" in the directory tells you how many you have completed. You are even rewarded with ASCII art upon completing a koan.