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MessagePack implementation for JRuby that uses the native Java library
Ruby Java
branch: master


This is not the MessagePack gem you are looking for

This project has been merged into the msgpack-ruby project and is now a part of the msgpack gem.

The msgpack-jruby gem will no longer be updated, all future development will go into the msgpack-ruby project to develop and maintain a single MessagePack library for all rubies.

MessagePack for JRuby

Build Status

A MessagePack implementation for JRuby, built on top of the MessagePack Java libraries. Faster and easier to use than using the C MessagePack gem in JRuby.


gem install msgpack-jruby

or with Bundler

gem 'msgpack-jruby', :require => 'msgpack'

Extra features

  • Decode keys as symbols by passing :symbolize_keys => true to #unpack.
  • Decode strings with their right encoding by passing :encoding => Encoding::UTF_8 to #unpack.


Copyright 2012-2013 Theo Hultberg and contributors

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

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.

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