Newbie executing app after deployed in Tomcat

Ruby JRuby
1

Hi you all,

I have installed jruby 1.1.2. I’ve made a simple application (copied
from
[1]), and this application works fine with Mongrel.

Problems have come when trying to execute it in Tomcat. I have installed
Warbler. I have generated the war and copied in tomcat/webapps (such as
explained in [2])
When starting Tomcat, the deployment works correctly (without apparent
mistakes). But when going to localhost:8080/myapp/posts, I have:
"Application initialization failed: null "

In logs I have something like:
29-may-2008 17:18:29 org.apache.catalina.core.ApplicationContext log
GRAVE: Exception caught
java.lang.NullPointerException
at org.jruby.runtime.load.LoadService.findFile(LoadService.java:466)
at
org.jruby.runtime.load.LoadService.findLibrary(LoadService.java:391)
at org.jruby.runtime.load.LoadService.smartLoad(LoadService.java:258)
at org.jruby.runtime.load.LoadService.require(LoadService.java:346)
at org.jruby.Ruby.initBuiltins(Ruby.java:1158)
at org.jruby.Ruby.init(Ruby.java:843)
at org.jruby.Ruby.newInstance(Ruby.java:158)
at
org.jruby.javasupport.JavaEmbedUtils.initialize(JavaEmbedUtils.java:85)
at
org.jruby.rack.DefaultRackApplicationFactory.newRuntime(DefaultRackApplicationFactory.java:79)
at
org.jruby.rack.DefaultRackApplicationFactory.createApplication(DefaultRackApplicationFactory.java:144)
at
org.jruby.rack.DefaultRackApplicationFactory.newApplication(DefaultRackApplicationFactory.java:44)
at
org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackApplicationFactory.java:52)
at
org.jruby.rack.PoolingRackApplicationFactory.getApplication(PoolingRackApplicationFactory.java:92)
at
org.jruby.rack.DefaultRackDispatcher.process(DefaultRackDispatcher.java:31)
at org.jruby.rack.RackFilter.doFilter(RackFilter.java:51)

Am i doing something wrong? I mean, do you have any clue about it?

[1]
http://blog.emptyway.com/2008/04/08/120-seconds-guide-to-jruby-on-rails/
[2] http://wiki.jruby.org/wiki/Jruby_on_Rails_on_Tomcat (the Rails 2.0
section)

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2

I am experiencing the exact same problems (same exception on the same
line
numbers) and don’t know where to begin, b/c the exception is so vague.
It
would be helpful if more descriptive error messages were provided by
JRuby-Rack. Any help would be greatly appreciated.

Damaris wrote:

mistakes). But when going to localhost:8080/myapp/posts, I have:
at org.jruby.Ruby.initBuiltins(Ruby.java:1158)
at
http://blog.emptyway.com/2008/04/08/120-seconds-guide-to-jruby-on-rails/
[2] http://wiki.jruby.org/wiki/Jruby_on_Rails_on_Tomcat (the Rails 2.0
section)

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3

Hi ,

That’s about the same for me…
Things works fine with JRuby 1.1 + Warbler 0.9.5, so I’m using this
combination for now when deploying on Tomcat.

Kana

"Application initialization failed: null "
at org.jruby.Ruby.init(Ruby.java:843)
org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackApplicationFactory.java:52)
[2] http://wiki.jruby.org/wiki/Jruby_on_Rails_on_Tomcat (the Rails 2.0

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4

But this is quite dissapointing. I mean, now is the environment setting
but,
which are the probability that some other error appears when developing
my
app? I mean, I’ m starting to see Jruby very unstable, and documentation
is
quite poor out there. I’ve been trying some conf settings such as in [1]
or
[2], but all is a bit of a mess, I mean, I dunno want to spend my time
googling here and there every time I have an error in Jruby :(.

I will give a try right now to see if with your combination works.
Thanks.

[1]

[2]
http://blog.nicksieger.com/articles/2007/09/04/warbler-a-little-birdie-to-introduce-your-rails-app-to-java

k-kotake wrote:

mistakes). But when going to localhost:8080/myapp/posts, I have:
at org.jruby.Ruby.initBuiltins(Ruby.java:1158)
at
http://blog.emptyway.com/2008/04/08/120-seconds-guide-to-jruby-on-rails/

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5

Hi
The wiki pages have not been helpful for me so far. My Jruby version is
1.1.2, I went to the code where the error apparently appears, but it was
a
catch(Exception e){}, so reading the code was not helpful either.

I’m running on Windows XP.
btw, I’ve installed warbler 0.9.5. and the problem now is that, after
deploying and starting Tomcat, a servlet exception appears telling Rails
could not be found. I’ve tried with jruby 1.1 too.

I’ve checked also my jar files, I have copied them in every place I
could,
under WEB-inf/lib, under tomcat/common/lib, under jruby-xx/lib…

Sorry if I’m just complaining :S, but I’m just getting a little bit
desperate as time passes :slight_smile:

Thanks for your patience.

Vladimir S.-2 wrote:

which are the probability that some other error appears when developing
If you found some problems that are not reflected there, feel free to
Thanks.

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6

Hi,

On Fri, May 30, 2008 at 4:42 PM, Damaris [email protected]
wrote:

The wiki pages have not been helpful for me so far. My Jruby version is
1.1.2, I went to the code where the error apparently appears, but it was a
catch(Exception e){}, so reading the code was not helpful either.

My understanding is that warbler comes with pre-built version of
JRuby, and at the moment that version is 1.1.1. If you look at 1.1.1
sources, you’ll see the line that fails (I copy-pasted it in my
previous email).

Nick would know more but he and the gang enjoying the Rubyconf at the
moment! :slight_smile:

I’m running on Windows XP.

OK, that’s one difference. I use Linux. Will try on Windows.

btw, I’ve installed warbler 0.9.5. and the problem now is that, after
deploying and starting Tomcat, a servlet exception appears telling Rails
could not be found. I’ve tried with jruby 1.1 too.

That’s what I had to adjust in warble.rb file so that my gems are picked
up:
config.gems = [“activerecord-jdbc-adapter”, “jruby-openssl”, “rails”,
“activerecord-jdbcmysql-adapter”]

After that, everything went by the book (by the wiki page).

Sorry if I’m just complaining :S, but I’m just getting a little bit
desperate as time passes :slight_smile:

Thanks for your patience.

And we’re getting there! :slight_smile: If you could debug on your side, and see
on which entry that findFile() method chockes, we’d have more info to
play with.
Meanwhile, I’ll try to reproduce on Windows here.

Thanks,
–Vladimir

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7

On Thu, May 29, 2008 at 10:20 AM, Damaris [email protected]
wrote:

mistakes). But when going to localhost:8080/myapp/posts, I have:
at org.jruby.Ruby.initBuiltins(Ruby.java:1158)
org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackApplicationFactory.java:52)
at
org.jruby.rack.PoolingRackApplicationFactory.getApplication(PoolingRackApplicationFactory.java:92)
at
org.jruby.rack.DefaultRackDispatcher.process(DefaultRackDispatcher.java:31)
at org.jruby.rack.RackFilter.doFilter(RackFilter.java:51)

Am i doing something wrong? I mean, do you have any clue about it?

It certainly is an unusual error – I haven’t seen it before. Because
we’re allowing a java stack trace to escape, I’d definitely say it’s a
JRuby bug.

Can you please create an issue in JIRA [1] and provide the version of
Tomcat you’re using, the complete contents of your server log file?
Also, if possible, can you attach the output of “jar tf myapp.war >
myapp.txt”? It will help us to track this more effectively than
through email.

Thanks,
/Nick

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8

Sorry, Nick, there is no [1] reference :S in your post.

Nick S.-2 wrote:

through email.

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9

Ok, I’ve got it and I have send the issue with the files.

As for previous posts, yes, I put the config.gems=[“rails”, …], but
the
same.

Nick S.-2 wrote:

explained in [2])
at
at
org.jruby.rack.DefaultRackDispatcher.process(DefaultRackDispatcher.java:31)
Also, if possible, can you attach the output of "jar tf myapp.war >

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10

Hi,

On Fri, May 30, 2008 at 3:13 PM, Damaris [email protected]
wrote:

But this is quite dissapointing.

Work with us, and once the problem is identified, it will be fixed.

I mean, now is the environment setting but,
which are the probability that some other error appears when developing my
app? I mean, I’ m starting to see Jruby very unstable, and documentation is
quite poor out there.

I’ve never deployed a rails app to Tomcat until today too.
And followed the wiki page, and in a couple of minutes, everything
was working just fine, deployed on Tomcat. The only info sources I used,
is the wiki pages. They actually are quite good and helpful.

If you found some problems that are not reflected there, feel free to
improve. That’s the whole point, everybody helping out a bit.

I’ve been trying some conf settings such as in [1] or
[2], but all is a bit of a mess, I mean, I dunno want to spend my time
googling here and there every time I have an error in Jruby :(.

Theese look like very old entries to me, they would probably add
more confusion then help.

I will give a try right now to see if with your combination works.
Thanks.

The latest Warbler comes with JRuby 1.1.1, and at that line mentioned
in your first email with stacktrace, I see:

if (current.getJarEntry(canonicalEntry) != null) {

My IDE helpfully notes that there is a chance of NullPointerException
for ‘current’ there! :slight_smile:
And, apparently, you’re hitting it. But I can’t reproduce it so far,
following the same documentations as you do.

We need to figure out what’s going on there or how to reproduce it
reliable,
and then the fix will be simple.

Btw, what platform do you use?

Thanks,
–Vladimir

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11

Bleh. sorry. [1] http://jira.codehaus.org/browse/JRUBY

Thanks.
/Nick

On Fri, May 30, 2008 at 10:41 AM, Damaris [email protected]
wrote:

Can you please create an issue in JIRA [1] and provide the version of

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