# Ruby and Rails on JVM

**URL:** <https://www.ruby-forum.com/t/ruby-and-rails-on-jvm/193642>\
**Category:** Rails\
**Created:** [August 20, 2010, 11:34pm UTC](https://www.ruby-forum.com/t/ruby-and-rails-on-jvm/193642 "2010-08-20T23:34:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![adi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/4da419/32.png) [@adi](https://www.ruby-forum.com/u/adi)\
**Post date:** [August 20, 2010, 11:34pm UTC](https://www.ruby-forum.com/t/ruby-and-rails-on-jvm/193642/1 "2010-08-20T23:34:53Z")

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Hi, sorry if this is OT. I wanted to if there are any limitations of  
jRuby.  
The community does not discuss this much and i feel its not used that  
much.  
What are the reasons?

Thanks,  
Adi

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**Author:** ![adi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/4da419/32.png) [@adi](https://www.ruby-forum.com/u/adi)\
**Post date:** [August 21, 2010, 7:47am UTC](https://www.ruby-forum.com/t/ruby-and-rails-on-jvm/193642/2 "2010-08-21T07:47:39Z")

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Adi wrote:

> Hi, sorry if this is OT. I wanted to if there are any limitations of  
> jRuby.  
> The community does not discuss this much and i feel its not used that  
> much.  
> What are the reasons?

Although your question is somewhat off-topic for this forum, since it  
should be directed to a JRuby forum, I’ll provide my two cents.

AFAIK the primary limitation of JRuby has to do with gems that use  
native C extensions. I believe that a good number of the most popular  
gems have already been ported over to Java extensions.

Given this limitation, it also means that JRuby gains access to a lot of  
Java code, in a more direct manner than C based Ruby implementations.

Why the interest in JRuby?"

What is your end goal?

Do you have some existing Java code libraries that you want to access  
from your Ruby on Rails application?

Are you in a “Java shop” and are attempting to “sneak” in some Ruby on  
Rails without disrupting your current deployment infrastructure?

These are all good reasons to consider JRuby. The team building JRuby  
seems to have made significant progress. I haven’t looked at it lately,  
so I don’t know how far along they are with Rails 3.0 support. But, they  
seem to have built a fast, reliable Ruby implementation.

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**Author:** ![adi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/4da419/32.png) [@adi](https://www.ruby-forum.com/u/adi)\
**Post date:** [September 15, 2010, 10:28am UTC](https://www.ruby-forum.com/t/ruby-and-rails-on-jvm/193642/3 "2010-09-15T10:28:02Z")

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Rails 3.0 has been designed to work with Ruby 1.8.7, Ruby 1.9.2 and  
JRuby 1.5.2+ as you can read in the blog post that announces the Rails  
3.0 release 🙂