Agora o tradicional monitor de perfomance para o mundo Rails está também disponível para aplicações Java.
New Relic RPM is already the most widely used application performance solution for Ruby on Rails applications. Now you can try this powerful software-as-a-service approach to manage your production Java applications. With RPM, implementation takes just a few minutes. Once installed you can monitor, troubleshoot and continuously tune your application. RPM for Java is now ready to try in our Private Beta program. Participation is absolutely free but limited to those willing to provide us feedback on bugs and usability.
Site: http://java.newrelic.com/