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March Hare, a JRuby RabbitMQ Client

March Hare is an idiomatic, fast and well-maintained (J)Ruby DSL on top of the RabbitMQ Java client. It strives to combine strong parts of the Java client with over 4 years of experience using and developing Ruby amqp gem and Bunny.

Why March Hare

  • Concurrency support on the JVM is excellent, with many tools & approaches available. Lets make use of it.
  • RabbitMQ Java client is rock solid and supports every RabbitMQ feature. Very nice.
  • It is screaming fast thanks to all the heavy duty being done in the pretty efficient & lightweight Java code.
  • It uses synchronous APIs where it makes sense and asynchronous APIs where it makes sense. Some other Ruby RabbitMQ clients only use one or the other.
  • amqp gem has certain amount of baggage it cannot drop because of backwards compatibility concerns. March Hare is a clean room design, much more open to radical new ideas.

What March Hare is not

March Hare is not

  • A replacement for the RabbitMQ Java client
  • A replacement for Bunny, the most popular Ruby RabbitMQ client
  • A long running "work queue" service

Project Maturity

March Hare has been around since 2011 and can be considered a mature library.

It is based on the RabbitMQ Java client, which is officially supported by the RabbitMQ team at VMware.

Installation, Dependency

With Rubygems

gem install march_hare

With Bundler

gem "march_hare", "~> 4.4"



MarchHare documentation guides are mostly complete.


Several code examples are available. Our test suite also has many code examples that demonstrate various parts of the API.


API reference is available.

Supported Ruby Versions

March Hare supports JRuby 9.0 or later.

Supported JDK Versions

March Hare requires JDK 8 or later.

Change Log


Continuous Integration

Continuous Integration status

CI is hosted by


You'll need a running RabbitMQ instance with all defaults and management plugin enabled on your local machine to run the specs.

To boot one via docker you can use:

docker run -p 5672:5672 -p 15672:15672 rabbitmq:3-management

And then you can run the specs using rspec:

bundle exec rspec


MIT, see LICENSE in the repository root


(c) 2011-2013 Theo Hultberg (c) 2013-2021 Michael S. Klishin and contributors