[jruby-user] Issue using JRuby-Rack 0.9.1 with Tomcat 6

[Myron Marston]

Hello,

 

I responded over a week ago to the JRuby-Rack 0.9.10 announcement with this error I'm seeing getting but never got any response.  I still haven't had any luck figuring this out, so I wanted to ask again. 

 

I'm trying to get my JRuby on Rails app running on Tomcat 6 using JRuby 1.1.3, Warbler 0.9.10, JRuby-Rack 0.9.1 and Rails 2.0.2.  The war seems to autodeploy fine, but when I try the app, I get the exception below.  The path to my deployed app is getting mangled, apparently by JRuby-Rack.  The relevant stack trace is below.  Somehow the path ".../.netbeans/6.1/..." becomes ".../.netbeans.1/..." (notice the missing /6).  And of course it can't find my rails environment file since that directory doesn't exist.  Has anyone seen this before?  Any idea how to deal with it?

Thanks,
Myron

The stack trace:
org.jruby.rack.RackInitializationException: No such file to load -- C:\Users\Myron\.netbeans.1\apache-tomcat-6.0.16_base\webapps\FractalComposerDotCom\WEB-INF/config/environment.rb
        from file:/C:/Users/Myron/.netbeans/6.1/apache-tomcat-6.0.16_base/webapps/FractalComposerDotCom/WEB-INF/lib/jruby-rack-0.9.1.jar!/jruby/rack/rails.rb:29:in `load_environment'
        from file:/C:/Users/Myron/.netbeans/6.1/apache-tomcat-6.0.16_base/webapps/FractalComposerDotCom/WEB-INF/lib/jruby-rack-0.9.1.jar!/jruby/rack/rails.rb:148:in `new'
        from <script>:3
        from file:/C:/Users/Myron/.netbeans/6.1/apache-tomcat-6.0.16_base/webapps/FractalComposerDotCom/WEB-INF/lib/jruby-rack-0.9.1.jar!/rack/builder.rb:22:in `instance_eval'
        from file:/C:/Users/Myron/.netbeans/6.1/apache-tomcat-6.0.16_base/webapps/FractalComposerDotCom/WEB-INF/lib/jruby-rack-0.9.1.jar!/rack/builder.rb:22:in `initialize'
        from <script>:3:in `new'
        from <script>:3

[Nick Sieger]

Hi Myron,

I haven't seen your error before, but I've seen other errors related
to Tomcat with JRuby-Rack. It's on my list to do some compatibility
testing with Tomcat soon.

Is there any part of your application or server configuration that
uses backslashes, or is that just coming out of JRuby or Java? The
code in JRuby-Rack that sets RAILS_ROOT is here:

http://github.com/nicksieger/jruby-rack/tree/master/src/main/ruby/jruby/rack/rails.rb#L18
http://github.com/nicksieger/jruby-rack/tree/master/src/main/ruby/jruby/rack/servlet_helper.rb#L131-137

Can you see anything in that code that would cause you problems?
Perhaps Tomcat doesn't like my usage of ServletContext.getRealPath?

Cheers,
/Nick

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[Myron Marston]

> Is there any part of your application or server configuration that
> uses backslashes, or is that just coming out of JRuby or Java?

It's coming out of JRuby and Java.  I searched my code base, and every use of a backslash character is as an escape character in a string or regular expression.

> The code in JRuby-Rack that sets RAILS_ROOT is here:

Do you think RAILS_ROOT is being set to the wrong value?  I'd like to test that, but I'm not sure how, since it never finds the config file and starts up.

> Can you see anything in that code that would cause you problems?
> Perhaps Tomcat doesn't like my usage of ServletContext.getRealPath?

Everything there looks fine to me, but I'm totally unfamiliar with the ServletContext interface and Tomcat (or any other java server)...so I don't think I'd recognize a non-obvious problem if there was one.

Given that you haven't seen this error before, it seems like there must be something with my code or configuration that isn't working properly.  Do you have any suggestions for how to go about trouble shooting this?

Thanks,
Myron

[Nick Sieger]

On Wed, Aug 6, 2008 at 7:25 PM, Myron Marston <myron....@gmail.com> wrote:
>> Is there any part of your application or server configuration that
>> uses backslashes, or is that just coming out of JRuby or Java?
>
> It's coming out of JRuby and Java. I searched my code base, and every use
> of a backslash character is as an escape character in a string or regular
> expression.
>
>> The code in JRuby-Rack that sets RAILS_ROOT is here:
>
> Do you think RAILS_ROOT is being set to the wrong value? I'd like to test
> that, but I'm not sure how, since it never finds the config file and starts
> up.
>
>> Can you see anything in that code that would cause you problems?
>> Perhaps Tomcat doesn't like my usage of ServletContext.getRealPath?
>
> Everything there looks fine to me, but I'm totally unfamiliar with the
> ServletContext interface and Tomcat (or any other java server)...so I don't
> think I'd recognize a non-obvious problem if there was one.
>
> Given that you haven't seen this error before, it seems like there must be
> something with my code or configuration that isn't working properly. Do you
> have any suggestions for how to go about trouble shooting this?

It's possible, but I'm more inclined to blame JRuby-Rack and/or
Tomcat, given that you haven't mentioned anything out of the ordinary
that you're doing with warbler and/or jruby-rack.

Sorry I don't have any immediate suggestions! If you have a sample app
that exhibits the behavior you see that I could try, that would be a
great help.

Cheers,
/Nick

[Myron Marston]

< Sorry I don't have any immediate suggestions! If you have a sample app
< that exhibits the behavior you see that I could try, that would be a
< great help.

I tried creating a new bare-bones rails app (no models, one controller, with one action and one view with some simple ERB).  When I deployed to Tomcat, I was able to access the "Welcome Aboard--you're riding Ruby on Rails" default index.html file (since its served statically), but as soon as I went to the URL for the controller, I got the exact same error.  So that definitely means that it's not something specific to my application.

I haven't fully decided whether I'll be using Tomcat or Glassfish to serve my app, so I've been working on getting it to work in Glassfish as well.  I've gotten that to work fine...so that seems to imply that there is something wrong with the way Tomcat is configured on my machine. 

I'm going to try downloading and installing Tomcat from scratch and see if I have any luck.

Thanks,
Myron

[Myron Marston]

Installing Tomcat from scratch fixed the problem.  Originally I was using the tomcat installation that comes with Netbeans 6.1.  I don't know whether I screwed it up or Netbeans misconfigured it....but regardless, it works now.