Configuring Ehcache for JRuby is done using the same ehcache.xml file as used for native Java Ehcache. The ehcache.xml file can be placed either in your Classpath or, alternatively, can be placed in the same directory as the Ruby file in which you create the CacheManager object from your Ruby code. For a Rails application, the ehcache.xml file should reside in the config directory of the Rails application.