[#JRUBY-1235] DRb hangs when transferring Ruby objects created in Java

JRuby

DRb hangs when transferring Ruby objects created in Java

Created: 24/Jul/07 02:19 PM Updated: 21/Mar/09 01:14 PM

Component/s:

Core Classes/Modules

Affects Version/s:

JRuby 1.0.0

Fix Version/s:

JRuby 1.2

Time Tracking:

Not Specified

Environment:

Mac OS X Tiger

Description

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If I use a Java class to create Ruby objects, they cannot be sent over DRb. i.e:

package com.kylemaxwell.development;
import org.jruby.*;
import java.util.*;
public class Fu
{
  public static RubyHash rubyHashPlease()
  {
    Ruby jruby = Ruby.getDefaultInstance();
    HashMap map = new HashMap();
    map.put(
       RubyString.newUnicodeString(jruby,  "foo"), 
      RubyString.newUnicodeString(jruby,  "bar")
    );
    return new RubyHash(jruby, map, new RubyNil(jruby));
  }
}

# jirb
 > require "java"
=> true
 > Fu = com.kylemaxwell.development.Fu
=> Java::ComKylemaxwellDevelopment::Fu
 > Fu.ruby_hash_please
=> {"foo"=>"bar"}
 > Fu.ruby_hash_please
=> {"foo"=>"bar"}
 > Marshal::dump _
=> "\004\010{\006\"\010foo\"\010bar"
 > Marshal::load _
=> {"foo"=>"bar"}
 > require 'drb'
=> true
 > DRb.start_service nil, Fu
=> #<DRb::DRbServer:0x9...
 > DRb.uri
=> "druby://kyle.wan:59476"

# other window...
 > require 'drb'
=> true
 > DRb.start_service
=> #<DRb::DRbServer:0x679f...
>> Fu = DRbObject.new nil, "druby://kyle.wan:59476"
=> #<DRb::DRbObject:0x65bd14 @ref=nil, @uri="druby://kyle.wan:59476">
 > Fu.ruby_hash_please
# Hangs....

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Charles Oliver Nutter added a comment - 21/Oct/07 10:16 PM

This is because our JavaObject wrapper does not delegate marshalling to Java serialization. We should probably fix this for 1.1, so that Java objects can be marshaled.

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Charles Oliver Nutter added a comment - 15/Feb/08 12:58 PM

Punting issues from 1.1 RC2 to 1.1 final.

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Charles Oliver Nutter added a comment - 17/Mar/08 01:10 AM

Java integration related, and a bit involved too. Post 1.1.

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Riley Lynch added a comment - 28/Dec/08 06:39 PM

See also ~~JRUBY-2128~~ for another Java object marshalling issue.

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Charles Oliver Nutter added a comment - 17/Feb/09 11:47 PM

This works now in JRuby 1.2, since I implemented marshalling for wrapped Java objects using Java serialization.

=> #<DRb::DRbObject:0x4662a3a1 @uri="druby://192.168.0.105:60863", @ref=nil>
irb(main):004:0> Fu.ruby_hash_please
=> {"foo"=>"bar"}