This nice 100+ page document is freely downloadable from Sun web site at:
http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf.
The document has copious information about tools like
jinfo, jmap, jstack, jconsole, jps, jstat, Heap Analysis Tool (HAT), Heap Profiler (HPROF), jdb, dbx; and discusses about fatal error handling, deadlock detection, memory leak diagnosis, diagnosing crashes in native code, compiled code, VM and HotSpot compiler threads etc., in detail. Must have document for majority of Java developers.
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