Ruby on Rails

Can any one help to integrate crystal reports with rails:
I was found the below link to integrate crystal reports in my rails
application.....
http://kkarthik.wordpress.com/
but i not understanding how to include those jar files in my rails
application......
i am not getting those jar files for download.........where i will get
those jar files..
(or)
Is there any better and easy way for generating reports??
please help me.....
thanks in advance for your help....
I am looking for your valuable replay....

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