Executing a Java jar file from my Rails app

rubyonrails-talk
1

Using the following as a reference: http://wiki.rubyonrails.org/rails/pages/HowtoGenerateJFreeCharts

I'm trying to build some charts and I need to call a .jar file from within my controller. Here's my code:

    pipe = IO.popen("java -jar /raid/projects/Dashboard/charting/ requestByProject.jar "+params[:name]+"")     pipe.close

This gives me nothing, however, if I run the command via the command line then it returns the images I need.

I'm running Rails through JRuby on a Sun Solaris machine if that helps at all.

Thanks.

2

I'm running Rails through JRuby on a Sun Solaris machine if that helps at all.

Yes, it makes a difference. The wiki article assumed you were running ruby, not JRuby. That's why the article uses a command-line invocation of java.

In JRuby, you should be able to do it natively via require 'java' and include_class, instead of invoking java on the command line.

This should get you started: http://kfahlgren.com/blog/2007/04/12/more-jruby-play-jfreechart/

- Mark.