Problem wrapping Voldemort client Java class into JRuby class: dependencies not loading

Russell_J · July 6, 2010, 1:17am

I am trying to use the Voldemort http://project-voldemort.com/ Java
client
from JRuby by wrapping the
voldemort.clienthttp://github.com/voldemort/voldemort/tree/master/src/java/voldemort/client/
Java
class in a JRuby module VoldemortClient. This is on OS X with the JRuby
downloaded from jruby.org.

See:

http://project-voldemort.com/quickstart.php
http://project-voldemort.com/javadoc/client/

github.com

voldemort/voldemort/blob/master/example/java/voldemort/examples/ClientExample.java

/*
 * Copyright 2008-2009 LinkedIn, Inc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package voldemort.examples;

import org.apache.avro.Schema;
import org.apache.avro.generic.GenericData;

This file has been truncated. show original

The code is here: voldemort_client.rb · GitHub

@calavera on Twitter was able to run this code, but no matter what I do
I
get this error when I require the voldemort_client lib:

/Users/rjurney//jruby-1.5.1/lib/ruby/site_ruby/shared/builtin/javasupport/core_ext/module.rb:53:in
import': cannot link Java class voldemort.client.SocketStoreClientFactory, probable missing dependency: org/jdom/Content (NameError) from ./lib/voldemort_client.rb:10 from ./lib/voldemort_client.rb:2:in require’
from ./test.rb:2

This also happens in jirb. I have tried manually importing the class
‘org.jdom.Content’ and it has no effect. It seems that
voldemort’s dependencies are not actually being imported. I have tried
requiring each of them manually, to their absolute path - but it has no
effect.

Help! Thanks,
Russ

Source to lib/voldemort_client.rb:

require ‘java’
PATH_TO_VOLDEMORT = ‘/Users/rjurney/voldemort/’

require File.expand_path(‘dist/voldemort-0.81.jar’, PATH_TO_VOLDEMORT)
Dir[File.expand_path(‘lib/*.jar’, PATH_TO_VOLDEMORT)].each {|jar|
require
jar}

module VoldemortClient
import ‘org.jdom.Content’
import ‘voldemort.client.ClientConfig’;
import ‘voldemort.client.SocketStoreClientFactory’;
import ‘voldemort.client.StoreClient’;
import ‘voldemort.client.StoreClientFactory’;
import ‘voldemort.versioning.Versioned’;

alternately, use the #import method

import “voldemort.client”
end

Russell_J · July 7, 2010, 1:33am

I resolved the problem by specifying all jars in my CLASSPATH, but I
don’t
understand why I had to do so.

Russell J.
http://twitter.com/rjurney
http://linkedin.com/in/russelljurney

On Jul 5, 2010, at 4:16 PM, Russell J. [email protected]
wrote: