Also recently read about that subject (JSR 174: Monitoring and Management Specification for the JavaTM Virtual Machine):
Monitoring and Management APIs: The java.lang.management package provides the interface for monitoring and managing the JVM. It provides access to information such as: number of classes loaded and threads running, memory consumption, garbage collection statistics, on-demand deadlock detection, and others.Since Sun made significant improvements of the memory handling:
New in the J2SE Platform version 1.5 is a feature referred to here as ergonomics. The goal of ergonomics is to provide good performance from the JVM with a minimum of command line tuning. Ergonomics attempts to match the best selection of
for an application.