Ehcache JRuby integration is provided by the jruby-ehcache gem. To install it, simply execute:

Note that you may need to use "sudo" to install gems on your system.

If you want Rails caching support, you should also install the correct gem for your Rails version:

An alternative installation is to simply add the appropriate jruby-ehcache-rails dependency to your Gemfile, and then run a Bundle Install. This will pull in the latest jruby-ehcache gem.

The jruby-ehcache gem comes bundled with the ehcache-core.jar. To use a different version of Ehcache, place the Ehcache jar in the same Classpath as JRuby (for standalone JRuby) or in the Rails lib directory (for Rails).