JDK not so hidden treasures
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This document provides a summary of various Java tools for monitoring and troubleshooting Java applications including: - jps - Lists Java processes instead of using ps - jmap - Prints shared object memory maps instead of using pmap - jstack - Prints Java stack traces for a Java process instead of using a debugger - jstat - Monitors Java virtual machine statistics similar to monitoring tools like top
JDK not so hidden treasures
- 1. JDK not so hidden treasures
- 3. about:me
- 6. java
- 7. If Java had true garbage collection, most programs would delete themselves upon execution Robert Sewell
- 8. tl;dr: log gc at least
- 9. every known problem becomes completely new when you add “in Java” stolen from: @mryapee
- 10. javac
- 12. javap
- 14. when things go…
- 15. does it run?
- 16. top // htop
- 19. jar
- 21. and jhat
- 22. stacktraces :)
- 23. kill -3 <pid>
- 24. caveat ;-)
- 25. jstack
- 26. quiz time
- 27. caveats only at safepoints, one thread at a time
- 28. jstat
- 30. jstatd
- 32. jcmd
- 34. jvisualvm