Open Source Profilers in Java

nfraRED is a tool for monitoring performance of a J2EE application and diagnosing performance problems. InfraRED uses AOP to weave the performance monitoring code into the application. It comes with out of the box support for AspectJ & Aspectwerkz. Salient Features: * Fully non-intrusive. No coding required by developers. * Layer-wise performance statistics summary (Web, Session, JDBC etc). * API level detailed performance statistics. * Call tree views (like in other profiler tools). * JDBC API and SQL statistics. * Last invocation statistics. * Correlation of statistics across layers. * Support for centralised gathering and presentation of performance data for one or more applications in a cluster. * Remote or local collection of performance metrics. * User-friendly web GUI. * Simplified ant-based integration with application. * Support for multiple application servers * Weblogic * Jboss * Tomcat * Useful for applications with or without use of EJBs. * Export summary of performance statistics into Excel spreadsheets. * Very low overhead, Can be used in production environments. * Ability to save and reload snapshots.