JDK not so hidden treasures

1. JDK not so hidden treasures

2. Andrzej Grzesik @ags313 andrzej@grzesik.it andrzejgrzesik.info

3. about:me

4. dev going deeper

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

18. jps instead of ps

19. jar

20. jmap instead of pmap

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

29. custom options http://hg.openjdk.java.net/jdk9/jdk9/jdk/ﬁle/d49e247dade6/src/jdk.jcmd/share/ classes/sun/tools/jstat/resources/jstat_options

30. jstatd

31. from http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm

32. jcmd

33. jmxsh jmxterm http://wiki.cyclopsgroup.org/jmxterm http://code.google.com/p/jmxsh/ and more

34. jvisualvm

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