This document discusses memory and thread issues that can occur with JRuby applications and how Eclipse Memory Analyzer can help address them. It provides an overview of Ruby and JRuby, common problems like memory leaks and thread issues, and how the Memory Analyzer tool works. It then describes a JRuby extension plugin for Memory Analyzer that can produce readable Ruby stack traces from heap dumps to help debug issues. Further enhancements are discussed along with a call for feedback.