# Help with warbler

**URL:** <https://www.ruby-forum.com/t/help-with-warbler/152252>\
**Category:** JRuby\
**Created:** [October 31, 2008, 8:18pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252 "2008-10-31T20:18:45Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 8:18pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/1 "2008-10-31T20:18:45Z")

</div>

I’m looking for assistance in using warbler to package a simple merb  
app. As I am new to JRuby and Merb, and Java in general, it’s very  
likely something that I have missed.

I’m using jruby 1.1.4 on Mac OSX 10.5.5 with Java 6.

I’ve successfully installed the latest (0.9.12) merb-core and merb-gen  
gems and their dependencies, mongrel, and warbler.

$ jruby -S gem li

\*\*\* LOCAL GEMS \*\*\*

abstract (1.0.0)  
diff-lcs (1.1.2)  
erubis (2.6.2)  
extlib (0.9.8)  
gem\_plugin (0.2.3)  
highline (1.4.0)  
hpricot (0.6.164)  
jruby-openssl (0.3)  
json\_pure (1.1.3)  
merb-core (0.9.12)  
merb-gen (0.9.12)  
mime-types (1.15)  
mongrel (1.1.5)  
rack (0.4.0)  
rake (0.8.3, 0.8.1)  
rspec (1.1.4)  
sources (0.0.1)  
templater (0.3.3)  
thor (0.9.8)  
warbler (0.9.11)

I created a merb application structure using merb-gen.

$ jruby -S merb-gen flat --orm none myapp  
Generating with flat generator:  
[ADDED] gems  
[ADDED] merb.thor  
[ADDED] .gitignore  
[ADDED] README.txt  
[ADDED] Rakefile  
[ADDED] application.rb  
[ADDED] config/framework.rb  
[ADDED] config/init.rb  
[ADDED] views/foo.html.erb  
[ADDED] spec

The “flat” template creates a simple merb app that runs  
out-of-the-box. Fire up merb to launch the mongrel to serve the app,  
browse to [http://localhost:4000](http://localhost:4000) and all looks good.

$ jruby -S merb  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
merb : worker (port 4000) ~ Starting Mongrel at port 4000  
merb : worker (port 4000) ~ Successfully bound to port 4000  
merb : worker (port 4000) ~ Started request handling: Fri Oct 31  
13:52:49 -0400 2008  
merb : worker (port 4000) ~ Routed to: {“controller”=\>“myapp”,  
“action”=\>“index”}  
merb : worker (port 4000) ~ Params: {“controller”=\>“myapp”,  
“action”=\>“index”}  
merb : worker (port 4000) ~ {:before\_filters\_time=\>0.000225,  
:after\_filters\_time=\>0.000174, :action\_time=\>0.002743,  
:dispatch\_time=\>0.006714}  
merb : worker (port 4000) ~

^Cmerb : worker (port 4000) ~ Reaping Workers

Looks good. Now try to bundle it into a war to deploy.

Attempting to use ‘warble config’ causes an error stating it needs the  
“merb” gem.

$ jruby -S warble config  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
rake aborted!  
gem ‘merb (= 0.9.12, runtime)’ not installed  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/gems/warbler-0.9.11/lib/warbler/task.rb:257:in  
`define\_single\_gem\_tasks’  
(See full trace by running task with --trace)

Something in warble assumes it needs the “merb” gem. Since the  
current 0.9.12 release of the default merb stack has a dependecy upon  
a native gem (do\_sqlite3) I quickly built my own “merb” gem that only  
has “merb-core” as a dependency and installed that.

$ jruby -S gem li

\*\*\* LOCAL GEMS \*\*\*

abstract (1.0.0)  
diff-lcs (1.1.2)  
erubis (2.6.2)  
extlib (0.9.8)  
gem\_plugin (0.2.3)  
highline (1.4.0)  
hpricot (0.6.164)  
jruby-openssl (0.3)  
json\_pure (1.1.3)  
merb (0.9.12)  
merb-core (0.9.12)  
merb-gen (0.9.12)  
mime-types (1.15)  
mongrel (1.1.5)  
rack (0.4.0)  
rake (0.8.3, 0.8.1)  
rspec (1.1.4)  
sources (0.0.1)  
templater (0.3.3)  
thor (0.9.8)  
warbler (0.9.11)

Now ‘warble config’ executes OKay.

$ jruby -S warble config --trace  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
\*\* Invoke config (first\_time)  
\*\* Execute config  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/gems/warbler-0.9.11/generators/warble/templates/warble.rb  
config/warble.rb

I edit the config/warble.rb as I think is appropriate.

(only uncommented lines below)

Warbler::Config.new do |config|  
config.dirs = %w(config gems log spec views)  
config.includes = FileList[“application.rb”]  
config.gems = [“merb-core”]  
config.gem\_dependencies = true  
config.webxml.booter = :merb  
end

In config/init.rb I add to the Merb::Config block to set path\_prefix.

c[:path\_prefix] = ‘/myapp’,

I then warble the app into a war.

$ jruby -S warble  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
mkdir -p tmp/war/WEB-INF/gems/specifications  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/merb-core-0.9.12.gemspec  
tmp/war/WEB-INF/gems/specifications/merb-core-0.9.12.gemspec  
mkdir -p tmp/war/WEB-INF/gems/gems  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/extlib-0.9.8.gemspec  
tmp/war/WEB-INF/gems/specifications/extlib-0.9.8.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/erubis-2.6.2.gemspec  
tmp/war/WEB-INF/gems/specifications/erubis-2.6.2.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/abstract-1.0.0.gemspec  
tmp/war/WEB-INF/gems/specifications/abstract-1.0.0.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/rake-0.8.3.gemspec  
tmp/war/WEB-INF/gems/specifications/rake-0.8.3.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/json\_pure-1.1.3.gemspec  
tmp/war/WEB-INF/gems/specifications/json\_pure-1.1.3.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/rspec-1.1.4.gemspec  
tmp/war/WEB-INF/gems/specifications/rspec-1.1.4.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/rack-0.4.0.gemspec  
tmp/war/WEB-INF/gems/specifications/rack-0.4.0.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/mime-types-1.15.gemspec  
tmp/war/WEB-INF/gems/specifications/mime-types-1.15.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/hpricot-0.6.164-java.gemspec  
tmp/war/WEB-INF/gems/specifications/hpricot-0.6.164-java.gemspec  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/thor-0.9.8.gemspec  
tmp/war/WEB-INF/gems/specifications/thor-0.9.8.gemspec  
mkdir -p tmp/war/WEB-INF/config  
mkdir -p tmp/war/WEB-INF/log  
mkdir -p tmp/war/WEB-INF/spec  
mkdir -p tmp/war/WEB-INF/views  
cp config/framework.rb tmp/war/WEB-INF/config/framework.rb  
cp config/init.rb tmp/war/WEB-INF/config/init.rb  
cp config/warble.rb tmp/war/WEB-INF/config/warble.rb  
cp log/merb.main.pid tmp/war/WEB-INF/log/merb.main.pid  
cp spec/spec\_helper.rb tmp/war/WEB-INF/spec/spec\_helper.rb  
cp views/foo.html.erb tmp/war/WEB-INF/views/foo.html.erb  
cp application.rb tmp/war/WEB-INF/application.rb  
mkdir -p tmp/war/WEB-INF/lib  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/gems/warbler-0.9.11/lib/jruby-complete-1.1.4.jar  
tmp/war/WEB-INF/lib/jruby-complete-1.1.4.jar  
cp  
/Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/gems/warbler-0.9.11/lib/jruby-rack-0.9.2.jar  
tmp/war/WEB-INF/lib/jruby-rack-0.9.2.jar  
mkdir -p tmp/war/WEB-INF

As far as I can tell all the parts needed are bundled into the myapp.war  
file.

I then deploy the war by copying it into a fresh install of Apache  
Tomcat.

$ cp myapp.war /Users/derek/Downloads/tc6/apache-tomcat-6.0.18/webapps/

I start Tomcat and browse to [http://localhost:8080](http://localhost:8080) and see the default  
Tomcat welcome page. I then try [http://localhost:8080/myapp](http://localhost:8080/myapp) and it  
churns for a little while and then return a 500 error from Rack.

Internal Server Error (500)  
Request Method: GET  
Request URL: [http://localhost:8080/myapp//500.html](http://localhost:8080/myapp//500.html)

Internal Server Error

You’re seeing this error because you use Rack::ShowStatus.

Tomcat logs show a java.lang.NullPointerException in  
DefaultRackDispatcher.  
[http://pastie.org/305132](http://pastie.org/305132)

Just in case it is a Tomcat issue I tried Glassfish2, but I get the  
same NullPointer problem.  
I also tried running Tomcat with JAVA\_OPTS=“-server -Xmx512m -Xms512m  
-XX:PermSize=256m -XX:MaxPermSize=512m” but with the same results.

Any assistance is appreciated.

Thanks,  
Derek

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<div class="post-metadata">

**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 8:53pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/2 "2008-10-31T20:53:52Z")

</div>

Warbler has some … interesting issues around non-rails apps. If it’s  
at all possible, you may want to try the most recent nightly builds of  
GF v3, which should have merb auto-deploy support in them. If that’s not  
possible, I remember that the merb wiki had a fairly good page on  
deploying merb apps through warbler, now unfortunately only accessible  
through the Google Cache  
[http://www.google.com/url?sa=t&source=web&ct=clnk&cd=10&url=http%3A%2F%2F209.85.173.104%2Fsearch%3Fq%3Dcache%3A8mRW3exN\_3kJ%3Awiki.merbivore.com%2Fpages%2Fdeploying-a-merb-application-to-a-jee-container-us%253Fversion%253D22%2Bmerb%2Bwarbler%26hl%3Den%26ct%3Dclnk%26cd%3D10%26gl%3Dus%26client%3Dfirefox-a&ei=iWELSY2ZCImMsAOFuLiPDw&usg=AFQjCNGoFvLdr-dEthh-T67C3YZv510WIg&sig2=wkYlycCrA8SngzFUsrm\_uQ](http://www.google.com/url?sa=t&source=web&ct=clnk&cd=10&url=http%3A%2F%2F209.85.173.104%2Fsearch%3Fq%3Dcache%3A8mRW3exN_3kJ%3Awiki.merbivore.com%2Fpages%2Fdeploying-a-merb-application-to-a-jee-container-us%253Fversion%253D22%2Bmerb%2Bwarbler%26hl%3Den%26ct%3Dclnk%26cd%3D10%26gl%3Dus%26client%3Dfirefox-a&ei=iWELSY2ZCImMsAOFuLiPDw&usg=AFQjCNGoFvLdr-dEthh-T67C3YZv510WIg&sig2=wkYlycCrA8SngzFUsrm_uQ)

---

<div class="post-metadata">

**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 10:11pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/3 "2008-10-31T22:11:17Z")

</div>

On Fri, Oct 31, 2008 at 2:18 PM, Derek N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> You’re seeing this error because you use Rack::ShowStatus.  
> Any assistance is appreciated.  
> Hey Derek, thanks for the detailed report. The latest version of  
> warbler was released with Merb ~ 0.9.3 support (approximately). My  
> best guess is that the more recent Merb changes are causing the  
> problem – from the trace it looks like the application never gets  
> initialized properly, so it has nothing to dispatch to.

Can you try this trunk snapshot version of jruby-rack? You can either  
configure java\_libs like so:

config.java\_libs.delete\_if {|f| f =~ /jruby-rack/}  
config.java\_libs += [“/path/to/jruby-rack-0.9.3-SNAPSHOT.jar”]

or simply replace the jruby-rack-0.9.2.jar inside the warbler gem.

[http://kenai.com/downloads/jruby-rack/jruby-rack-0.9.3-SNAPSHOT.jar](http://kenai.com/downloads/jruby-rack/jruby-rack-0.9.3-SNAPSHOT.jar)

If you can let me know if that helps at all, that would be great, as  
it would give me more incentive to get a new release out now that Merb  
is nearing 1.0 status.

Thanks!  
/Nick

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**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 10:11pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/4 "2008-10-31T22:11:55Z")

</div>

Jacob;

Thanks for the response. I’ll take a look at GF3; Its features for  
merb sound promising. Given the experiemental nature of the GF3  
nightly builds it doesn’t seem like it is a viable option for a  
production deployment currently.

Thanks again.

Best regards,  
Derek

On Fri, Oct 31, 2008 at 4:07 PM, Jacob K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> likely something that I have missed.  
> abstract (1.0.0)  
> mime-types (1.15)
> 
> ```
> [ADDED] views/foo.html.erb
> 
> ```
> 
> merb : worker (port 4000) ~ Successfully bound to port 4000
> 
> Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
> a native gem (do\_sqlite3) I quickly built my own “merb” gem that only  
> gem\_plugin (0.2.3)  
> rake (0.8.3, 0.8.1)  
> Loading init file from /Users/derek/jruby/testing/myapp/config/init.rb  
> (only uncommented lines below)
> 
> mkdir -p tmp/war/WEB-INF/gems/specifications  
> cp  
> tmp/war/WEB-INF/gems/specifications/rspec-1.1.4.gemspec  
> /Users/derek/jruby/1.1.4/jruby-1.1.4/lib/ruby/gems/1.8/specifications/thor-0.9.8.gemspec  
> cp views/foo.html.erb tmp/war/WEB-INF/views/foo.html.erb
> 
> churns for a little while and then return a 500 error from Rack.

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**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 11:12pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/5 "2008-10-31T23:12:12Z")

</div>

On Fri, Oct 31, 2008 at 4:43 PM, Derek N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> Nick;
> 
> I grabbed the jruby-rack snapshot, added the java\_libs to my  
> config/warble.rb, re-warbled the app, and deployed the new war to  
> Tomcat.
> 
> I am pleased to report that my simple Merb app is now working!

Awesome!

> So when is the next release of jruby-rack? Or are the current  
> snapshots stable enough to use?

With JRuby 1.1.5 imminent, I can see a new combo Warbler/JRuby-Rack  
release happening soon, perhaps next week during RubyConf.

> Also, is there a way to direct warbler to not require the ‘merb’ gem?  
> When I run ‘warble config’ it seems to require the ‘merb’ gem. For  
> the projects I am working on I don’t need the full merb stack,  
> specifically the DataMapper components, and so am installing only the  
> merb gems that I need. It seems the current version of warbler looks  
> for the ‘merb’ gem even though it isn’t being used in the merb app.

I myself have not used Merb very much; I added auto-including the  
“merb” gem to be similar to what Warbler does with Rails. But perhaps  
all it should do is include “merb-core”? Would that be more inline  
with Merb best practices?

Cheers,  
/Nick

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<div class="post-metadata">

**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [October 31, 2008, 10:43pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/6 "2008-10-31T22:43:32Z")

</div>

On Fri, Oct 31, 2008 at 5:10 PM, Nick S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> If you can let me know if that helps at all, that would be great, as  
> it would give me more incentive to get a new release out now that Merb  
> is nearing 1.0 status.

Nick;

I grabbed the jruby-rack snapshot, added the java\_libs to my  
config/warble.rb, re-warbled the app, and deployed the new war to  
Tomcat.

I am pleased to report that my simple Merb app is now working!

Tomcat logs looking good:

Oct 31, 2008 5:26:29 PM org.apache.catalina.core.ApplicationContext log  
INFO: D, [2008-10-31T17:26:29.981383 #1047] DEBUG – : Registering  
Merb servlet adapter

Oct 31, 2008 5:26:29 PM org.apache.catalina.core.ApplicationContext log  
INFO: D, [2008-10-31T17:26:29.994904 #1047] DEBUG – : Loading Merb  
servlet sessions

Oct 31, 2008 5:26:30 PM org.apache.catalina.core.ApplicationContext log  
INFO: D, [2008-10-31T17:26:30.024602 #1047] DEBUG – : Starting Merb

Oct 31, 2008 5:26:30 PM org.apache.catalina.core.ApplicationContext log  
INFO: ContextListener: contextInitialized()  
Oct 31, 2008 5:26:30 PM org.apache.catalina.core.ApplicationContext log  
INFO: SessionListener: contextInitialized()

Thanks, Nick!

So when is the next release of jruby-rack? Or are the current  
snapshots stable enough to use?

Also, is there a way to direct warbler to not require the ‘merb’ gem?  
When I run ‘warble config’ it seems to require the ‘merb’ gem. For  
the projects I am working on I don’t need the full merb stack,  
specifically the DataMapper components, and so am installing only the  
merb gems that I need. It seems the current version of warbler looks  
for the ‘merb’ gem even though it isn’t being used in the merb app.

Great stuff! Thanks again.

Regards,  
Derek

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**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [November 1, 2008, 3:16am UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/7 "2008-11-01T03:16:01Z")

</div>

On Fri, Oct 31, 2008 at 6:11 PM, Nick S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> With JRuby 1.1.5 imminent, I can see a new combo Warbler/JRuby-Rack  
> release happening soon, perhaps next week during RubyConf.

Great!

> I myself have not used Merb very much; I added auto-including the  
> “merb” gem to be similar to what Warbler does with Rails. But perhaps  
> all it should do is include “merb-core”? Would that be more inline  
> with Merb best practices?

I’m far from the best person to ask that, but a quick look at the gem  
dependencies for a current install of the merb stack shows that all of  
the gems depend either directly or indirectly on ‘merb-core’. It  
would seem to be the reasonable choice to include. As far as I can  
tell the ‘merb’ gem itself is only a simple means to pull in all the  
dependencies for a “full stack” (core + extra goodies + orm) but  
provides no further function.

Thanks again for your help.

Regards,  
Derek

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**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [November 25, 2008, 6:55pm UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/8 "2008-11-25T18:55:47Z")

</div>

On Mon, Nov 24, 2008 at 8:37 PM, Derek N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> On Fri, Oct 31, 2008 at 5:11 PM, Nick S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:
> 
> > With JRuby 1.1.5 imminent, I can see a new combo Warbler/JRuby-Rack  
> > release happening soon, perhaps next week during RubyConf.
> 
> Hey Nick.
> 
> Any ETA on the next release of warbler/jruby-rack?

Hey Derek, thanks for the poke. Here’s my current plan:

- Release new jruby-rack and activercord-jdbc soon (hopefully later  
today)
- Release new Warbler after JRuby 1.1.6 hits in about a week.

Warbler itself doesn’t have too many changes, so you should be able  
to upgrade to jruby 1.1.5 and jruby-rack inside warbler yourself.

Regards,  
/Nick

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<div class="post-metadata">

**Author:** ![Derek\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/8797f3/32.png) [@Derek\_N](https://www.ruby-forum.com/u/Derek_N)\
**Post date:** [November 25, 2008, 3:38am UTC](https://www.ruby-forum.com/t/help-with-warbler/152252/9 "2008-11-25T03:38:24Z")

</div>

On Fri, Oct 31, 2008 at 5:11 PM, Nick S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> With JRuby 1.1.5 imminent, I can see a new combo Warbler/JRuby-Rack  
> release happening soon, perhaps next week during RubyConf.

Hey Nick.

Any ETA on the next release of warbler/jruby-rack?

Thanks!

Derek

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