Help with warbler

Derek_N · October 31, 2008, 8:18pm

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 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 and see the default
Tomcat welcome page. I then try 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

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

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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Derek_N · October 31, 2008, 8:53pm

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

Derek_N · October 31, 2008, 10:11pm

On Fri, Oct 31, 2008 at 2:18 PM, Derek N. [email protected]
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

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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Derek_N · October 31, 2008, 10:11pm

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. [email protected]
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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Derek_N · October 31, 2008, 11:12pm

On Fri, Oct 31, 2008 at 4:43 PM, Derek N. [email protected]
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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Derek_N · October 31, 2008, 10:43pm

On Fri, Oct 31, 2008 at 5:10 PM, Nick S. [email protected]
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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Derek_N · November 1, 2008, 3:16am

On Fri, Oct 31, 2008 at 6:11 PM, Nick S. [email protected]
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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Derek_N · November 25, 2008, 6:55pm

On Mon, Nov 24, 2008 at 8:37 PM, Derek N. [email protected]
wrote:

On Fri, Oct 31, 2008 at 5:11 PM, Nick S. [email protected] 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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Derek_N · November 25, 2008, 3:38am

On Fri, Oct 31, 2008 at 5:11 PM, Nick S. [email protected]
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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