1. Getting a Stack Trace
jstack -l [pid]
jstack is for java processes
2. Getting a Thread Dump
kill -3 [pid]
on unix
3. Surviving a OutOfMemoryException in Production
Sometimes you see an “OutOfMemoryException” in production and you need a memory dump of this process now to analyze the memory usage
jmap -J-d64 -dump:live,format=b,file=solr-memory-dump.bin [pid]
jmap generates a memory dump file solr-memory-dump.bin that can be used for further analysis
jhat -J-d64 -J-Xmx4096m solr-memory-dump.bin
jhat opens HTTP server on port ‘7000’
electrobabe.at 
Kleiner Tipp: Etwas komfortabler um heapdumps zu analysieren sind unser HeapAnalyzer oder der Eclipse Memory Analyzer.