Deploy class-files of a RoR-Application in a .war File

Ruby JRuby
1

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Hi,

I’d like to package a RoR app using warble in such a way that the main
part of the application is being precompiled into Java bytecode using
jrubyc. What I currently have tried is to do a

$ jrubyc app/controller/*.rb
$ rake warble

and then unzip the resulting .war file, remove the controller *.rb
files, so that only the compiled .class files remain. If I then deploy
the app I get a scaring stack trace.

Is there some option which I can apply to warbler so that I get
precompiled classes?

Best regards,
Christian

“He’s a gun-slinging dishevelled firefighter haunted by memories of
'Nam. She’s a sharp-shooting African-American opera singer who hides
her
beauty behind a pair of thick-framed spectacles. They fight crime!”

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On Fri, Dec 5, 2008 at 10:18 AM, Christian N. [email protected]
wrote:

   $ jrubyc app/controller/*.rb
   $ rake warble

and then unzip the resulting .war file, remove the controller *.rb
files, so that only the compiled .class files remain. If I then deploy
the app I get a scaring stack trace.

Is there some option which I can apply to warbler so that I get
precompiled classes?

There’s no option as of yet, but it sounds like a good potential
feature enhancement. Although I created and maintain Warbler, I
haven’t had the need for ahead-of-time compiled scripts. So if someone
else wants to investigate what it would take and send a patch or way
forward, I’d be happy to accept such help.

/Nick

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Hi Nick,

Nick S. wrote:

There’s no option as of yet, but it sounds like a good potential
feature enhancement. Although I created and maintain Warbler, I
haven’t had the need for ahead-of-time compiled scripts. So if someone
else wants to investigate what it would take and send a patch or way
forward, I’d be happy to accept such help.

/Nick

I’d like to dig into this matter. I guess the starting point would be
jruby-rack. If you could point me to some documentation and/or starting
points in the codebase of jruby-rack, I would appreciate that.

Thanks,
Christian

“He’s a jaded voodoo vagrant on the wrong side of the law. She’s a
chain-smoking mutant Hell’s Angel trying to make a difference in a
man’s
world. They fight crime!”

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Christian N. wrote:

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Hi,

I’d like to package a RoR app using warble in such a way that the main
part of the application is being precompiled into Java bytecode using
jrubyc.

Is this something that Rawr could help with?

rawr.rubyforge.org

James B.

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On Tue, Dec 9, 2008 at 6:49 AM, Christian N. [email protected]
wrote:

I’d like to dig into this matter. I guess the starting point would be
jruby-rack. If you could point me to some documentation and/or starting
points in the codebase of jruby-rack, I would appreciate that.

Hopefully you won’t need to touch jruby-rack. Warbler, on the other
hand, may be what you are looking for 1. Instead, if you could read
up on past threads [e.g., 2] and figure out a standard approach for
pre-compiling scripts and including them in the war file, and perhaps
find a way to integrate that into Warbler, that would be fantastic.

/Nick

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james schrieb:

Is this something that Rawr could help with?

rawr.rubyforge.org

Thanks for the hint James. For now I think that the simplest solution
would be to add compilation support to warbler. Which means that instead
of the .rb files simply the .class files are packaged into the .war I
currently see no need for packaging the compiled class files into a .jar
which then would be added to the .war.

Perhaps rawr can be added in a later stage.

“He’s a benighted vegetarian filmmaker on a search for his missing
sister. She’s a mentally unstable impetuous femme fatale with someone
else’s memories. They fight crime!”

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Christian N. wrote:

find a way to integrate that into Warbler, that would be fantastic.

/Nick

Thanks so far Nick, I will look into this.

Just a quick note with what I have found out so far:

I used the rails example app which is provided with jruby-rack as a
testing ground.

First, I did some compilation tests so that the application can be
started with ‘jruby ./script/server’ using the compiled .class files.

I simply compiled the .rb files using the following command-line:

find app public -name “*.rb” | xargs jrubyc

As it turns out .rb Files under config/ cannot be compiled into .class
files, because for example config/boot.rb uses File.read to directly
load .rb files ( File.read(“#{RAILS_ROOT}/config/environment.rb”)) if
these are replaced with .class files rails spits out a file not found
error and the app does not work.

As jruby prefers .class files over .rb files, they can coexist.

If for example app/controller/*.rb files are missing but the compiled
classes exist instead, the application does not work, because rails
somehow needs the .rb files for routing purposes. If a controller .class
file exists without a corresponding .rb file, we get the following error
(for the snoop controller):

No route matches “/snoop” with {:method=>:get}

So as it seems .class files have to coexist with their corresponding .rb
files (at least where direct IO is used within the rails framework).

With the command-line mentioned above, I am able to compile a rails
application and then start and run it using ./script/server.

Unfortunately deploying a .war file generated by warbler does not work.
I believe that jruby-rack causes some trouble here. If the example
application is being compiled, warbled and then deployed (I use jboss
4.2.3GA) I get the following stacktrace just before the application
could be correctly initalized:

21:10:42,066 ERROR [[/rails]] Exception caught
org.jruby.rack.RackInitializationException: IO error –
/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/app/controllers/application
from
/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:177:in
call' from /home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:177:in evaluate_method’
from
/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:161:in
call' from /home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:90:in run’
from
/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:90:in
each' from /home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:90:in run’
from
/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/activesupport-2.1.0/lib/active_support/callbacks.rb:272:in
run_callbacks' from /home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/gems/gems/rails-2.1.0/lib/initializer.rb:483:in prepare_dispatcher’
… 7 levels…
from
file:/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/lib/jruby-rack-0.9.2.jar!/rack/builder.rb:22:in
instance_eval' from file:/home/nolte/tools/jboss-4.2.3.GA/server/default/tmp/deploy/tmp8666342699739510041rails-exp.war/WEB-INF/lib/jruby-rack-0.9.2.jar!/rack/builder.rb:22:in initialize’
from :3

at
org.jruby.rack.DefaultRackApplicationFactory$4.init(DefaultRackApplicationFactory.java:159)
at
org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackApplicationFactory.java:53)
at
org.jruby.rack.PoolingRackApplicationFactory.getApplication(PoolingRackApplicationFactory.java:97)
at
org.jruby.rack.DefaultRackDispatcher.process(DefaultRackDispatcher.java:31)
at org.jruby.rack.RackFilter.doFilter(RackFilter.java:51)

The problem here is that controllers/application(.rb) cannot correctly
be loaded, even if the corresponding .rb file exists in the deployment.

“He’s a short-sighted chivalrous hairdresser from the 'hood. She’s a
bloodthirsty blonde wrestler from the wrong side of the tracks. They
fight crime!”

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Nick S. schrieb:

/Nick

Thanks so far Nick, I will look into this.

“He’s an ungodly arachnophobic messiah with nothing left to lose. She’s
a foxy psychic detective from a secret island of warrior women. They
fight crime!”

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