All these tools work with any version of JRuby, but as part of JRuby 1.6 development I've been adding some enhancements. Specifically, I've made some modifications that allow Ruby objects to show up side-by-side with Java objects in memory profiles. A little explanation is in order. In JRuby, all the core classes are represented by "native" Java classes. Object is represented by org.jruby.RubyObje