[jruby-user] ActiveRecord 3.0, 3.2 thread safety and connection pool fairness

I've been trying to run a few non-Rails ActiveRecord apps in a Java 
servlet
container in full multithreaded mode. I kept running into problems 
under
moderate load, and I believe I've tracked down the causes.

I want to post this for posterity and ask if other JRuby users have 
seen these
same problems. I am also seeking testing and comments on my patches, if 
possible.

1) ActiveRecord has thread safety issues. I see this error in my logs
"Detected invalid hash contents due to unsynchronized modifications 
with
concurrent users org/jruby/RubyHash.java:1356:in `keys'"

Fix accepted: https://github.com/rails/rails/pull/6398/files

2) ActiveRecord's connection pool is not "fair". My thread pool is 
larger
than my database connection pool, and I regularly see timeouts 
acquiring
database connections under only moderate load (where direct JDBC calls 
for
a container-managed connection pool see no such timeouts).

Fix also accepted (though it somehow breaks tests of eager loading on 
postgres),
but this is more complex and not so clean: 
https://github.com/rails/rails/pull/6416

[jruby-user] [ANN] JRuby 1.7.0.preview1 released

The JRuby community is pleased to announce the release of JRuby 1.7.0.preview1.

- Homepage: http://www.jruby.org/
- Download: http://www.jruby.org/download

This is the first preview release of JRuby 1.7. This release
represents a tremendous amount of work by dozens of contributors, and
there are improvements in every subsystem. Users on Java 7 should
start to see gains from invokedynamic, the JVM’s new support for
dynamic languages. Users of highly-concurrent applications will see
improvements in throughput and raw parallelism. And we have upped our
compatibility level to match Ruby 1.9.3.

We have opted for a preview cycle this time due to the significance of
changes in this release and our desire to give users more time to test
JRuby before releasing 1.7 final. When in doubt, file a bug...we’ll
sort it out. We want to know issues users have with JRuby 1.7 sooner
rather than later.

### Notable Changes:

- 1\.9\.3 is now our default runtime mode (--1.8 is needed for 1.8.7 support)
- Many 1.9.x compatibility fixes
- Support for Java 7’s invokedynamic*
- Performance and concurrency improvements
- Java 5 support dropped (Java 6+ required)
- Update to Rubygems 1.8.24
- Update to Rake 0.9.2.2
- 259 issues resolved

[jruby-user] Java and JRuby tight integration

[jruby-user] Uniform Qt bindings for JRuby and Ruby

Hi everyone,
I have just uploaded a new Gem package (qt_connect) with the aim to
provide a uniform Qt API for both Ruby and JRuby platforms. The Gem
provides JRuby bindings to the Qt Jambi Java library with an (optional)
extension to provide backward compatibility with existing Qt Ruby
programs.
The same Gem package provides for Qt Ruby programs a QtJambi inspired
interface to the Signals/Slots system without the need to use C++
signatures.

download from RubyGems.org: gem install qt_connect
project on github: https://github.com/CeesZ/qt_connect

(Qt is a cross-platform application framework that is widely used for
developing application software with a graphical user interface)

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[jruby-user] awt.FileDialog.set_filename_filter doesn't work

Anybody have any ideas why my "filename filter" doesn't appear to get
called here?

require 'java'
java_import java.awt.FileDialog
    out = FileDialog.new(nil, "title", FileDialog::LOAD)
      out.set_filename_filter {|file, name|
    puts 'hello' # never reached
  }
out.show

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[jruby-user] rawr - include gems?

Hi all,

First thing first: I'm quite new to ruby.
I have a small project (a little toy compiler), written in jruby. I'd
like to make a jar out of it, so I tried rawr, but I couldn't seem to
get the thing right.
The problem is that is uses two gems (parslet and bitescript), and I
don't really know how to include them.
The goal would be to be able to run the jar in an environment with no
jruby at all, let alone the gems.
Is that possible? If so, can you please help me with it?

Many thanks,
Zs

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[jruby-user] Weird behavior in Array#sort of 2 Time objects

I'm seeing some very strange behavior while trying to sort an array with
2 elements.  Here is the code:

      work_periods = day_array[wday] || []
      puts "work_periods=#{work_periods.inspect}"
      puts "work_periods.length=#{work_periods.length}"
      begin
        work_periods = work_periods.sort { |a,b| puts
"a=#{a.start_time.class.inspect} b=#{b.start_time.class.inspect}"; stat
= (a.start_time < b.start_time); puts "stat=#{stat}"; stat }
      rescue Exception => e
        puts "e=#{e.message}\n\t#{e.backtrace.join("\n\t")}"
        raise
      end
      puts "got here"

And here is the output:

work_periods=[#<WorkPeriod id: 6, weekly_schedule_id: 2, site_id: 1,
day: 1, start_time: "2000-01-01 08:00:00", end_time: "2000-01-01
12:00:00">, #<WorkPeriod id: 476, weekly_schedule_id: 2, site_id: 2,
day: 1, start_time: "2000-01-01 14:00:00", end_time: "2000-01-01
17:00:00">]
work_periods.length=2
a=Time b=Time
stat=false
e=undefined method `>' for false:FalseClass
  org/jruby/RubyArray.java:3252:in `sort!'
  org/jruby/RubyArray.java:3226:in `sort'
  /Users/rugger/Documents/acme/app/models/weekly_schedule.rb:24:in
`each_out_of_office_time'
  org/jruby/RubyRange.java:445:in `each'

Anyone have any idea whats going on?  Either I'm missing something
completely obvious or I'm running into a JRuby bug.  I'm using 1.6.7 in
1.9 mode.

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[jruby-user] [ANN] Ruboto 0.6.0 released!

The Ruboto team is proud to announce the release of Ruboto 0.6.0.

Ruboto is a framework for writing full Android apps in Ruby. It includes support libraries and generators
for creating projects, classes, tests, and more.

New in version 0.6.0:

Features:

* Issue #143 Move Ruboto Rake tasks to rakelib/ruboto.rake and let Rakefile be project specific
* Issue #155 Switch default compatibility level to Ruby 1.9
* Issue #156 Set default target to Android 2.2 api level 8
* Issue #158 On-device generation of Java subclasses
* Issue #168 Make exception from scripts propagate to the caller for debug packages
* Issue #169 Enable running tests not on UI thread.

Bugfixes:

* Issue #172 ruboto update of BroadcastReceiver adds new_with_callbacks call even if it exists

Support:

* Issue #152 Ruboto release 0.5.3 build tool fails
* Issue #160 Failed to create new project
* Issue #161 More helpful error reporting in app creation process

Documentation:

* Issue #159 non constant values

Installation:

To use Ruboto, you need to install a Java JDK, the Android SDK, Apache ANT, and a Ruby implementation.  Then do
(possibly as root)

gem install ruboto

To create a project do

ruboto gen app --package <your.package.name>

You can find an introductory tutorial at https://github.com/ruboto/ruboto/wiki/Tutorial%3A-Getting-started-with-Ruboto

If you have any problems or questions, come see us at http://ruboto.org/

Enjoy!

--
Uwe Kubosch
http://ruboto.org/

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[jruby-user] Typhoeus alternatives?

Hello all.

I am looking for an HTTP client that can do multiple requests in parallel.

There is the typhoeus gem but I am running on windows and I would rather 
skip the hassle that windows entails with this gem.

Does anyone have any typhoeus alternatives that they have used on JRuby? 
(I seem to remember there was a Java library that someone suggested 
using instead but I cannot remember the name. )

Worst case I simple do the threading part myself and use basic Net::HTTP 
but a nicer solution would be...well, nicer ;)

Cheers

Jeff

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[jruby-user] rake aborted! Please install the jdbcpostgresql adapter

HELP! Please! I'm pulling my hair out!

Ok, I'm just trying to get jruby to work with postgresql.  With
postgresql server running, and webrick running, I create a project,
with:
rails new myproj
I edit the file database.yml to be:
development:
  adapter: jdbcpostgresql
  database: db/development.pg
  username: postgres
  password: XXXXXXXX
  host: localhost

(replacing XXXXXXXX for my real password, same for test & prod).  Then
in a terminal window, in my project directory, I type:
$ sudo jruby -S rake db:create

Error message I get back is:
rake aborted!
Please install the jdbcpostgresql adapter: `gem install
activerecord-jdbcpostgresql-adapter` (no such file to load --
active_record/connection_adapters/jdbcpostgresql_adapter)

But, I've already installed it with:
$ sudo jruby -S gem install jdbc-postgres
activerecord-jdbcpostgresql-adapter

Successfully installed jdbc-postgres-9.1.901
Successfully installed activerecord-jdbcpostgresql-adapter-1.2.2
2 gems installed

I stop webrick, do the install above, restart webrick, rake gives same
error.
=> Booting WEBrick
=> Rails 3.2.3 application starting in development on
http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2012-05-05 20:02:58] INFO  WEBrick 1.3.1
[2012-05-05 20:02:58] INFO  ruby 1.8.7 (2012-02-22) [java]
[2012-05-05 20:03:03] INFO  WEBrick::HTTPServer#start: pid=2089
port=3000

$ jruby -S rake db:create --trace
output is attached to this post.

I know postgresql is running because:
$ sudo /etc/init.d/postgresql stop
 * Stopping PostgreSQL 9.1 database server

I can then start it back up with:
$ sudo /etc/init.d/postgresql start
 * Starting PostgreSQL 9.1 database server

I've also ensured that I uncomment the following line in
/etc/postgresql/9.1/main/postgresql.conf:
listen_addresses = 'localhost'

After renaming the default rails index.html in the public folder,
creating a controller, and setting up index.html.erb in the views
directory
localhost:3000 in firefox gives me the test page correctly. So I know
this part works.

here's some extra info. I'm on Ubuntu 12.04, Gnome 3.4,
Which ruby gives:
/usr/bin/ruby

ruby -v gives:
ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]

jruby -v gives:
jruby 1.6.7 (ruby-1.8.7-p357) (2012-02-22 3e82bc8) (OpenJDK 64-Bit
Server VM 1.6.0_24) [linux-amd64-java]

java -version gives:
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (6b24-1.11.1-4ubuntu2)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

irb is working, gives:
irb(main):001:0> puts ((11.to_s * 2).to_i/2)
555
=> nil
irb(main):002:0>

But why is rake not working with postgresql?

Attachments:
http://www.ruby-forum.com/attachment/7367/trace-for-rake-db-create.txt

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[jruby-user] Problems with Ruby.getClass

Hi,

I've ran into a little problem while starting off with JRuby embedding.
I'm using the following code fragment for getting the RubyClass of a class:

String[] paths = new String[]{"."};
Ruby rt = JavaEmbedUtils.initialize(Arrays.asList(paths));
rt.executeScript(FileUtils.readFileToString(new File("bar.rb")), "bar.rb");
System.out.println("cl: "+rt.getClass("Foo::Bar"));

Is the correct way to do it?

The problem is that Ruby.getClass method call returns null.
If I rename class Foo::Bar to Bar the method call returns a non-null value.
I'm working with a code base that uses this naming convention for
subclasses and I can't change the convention.

I'm using JRuby v1.6.7

marko

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