The vip.com's java coding standard, libraries and tools
...Best practices regarding the performance and availability of back-end applications. Observe the JVM process indicators and their busy threads. Generational printing version of JMAP. Online emergency collection of JVM data script.
Madmap is a tool to help analyze java heap dumps. New in v1.1 it supports hprof ascii and now binary dumps collected with jmap. It helps find memory leaks by showing the live set and automatically calculating which objects retain the most heap size.