JDK, the not so hidden treasures
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Transcript of JDK, the not so hidden treasures
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JDK not so hidden treasuresAndrzej Grzesik
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@javazone @ags313please tweet!
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questions?just ask!
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java
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$JAVA_HOME/bin
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tl;dr: log gc please
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log gc :-)
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when things go…
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does it run?
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top // htop
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every known problem becomes completely new
when you add “in Java”
stolen from: @mryapee
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jpsinstead of ps
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jpsinstead of ps
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jps -lvmJava ProcesseS LoVe Memory
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jar
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jar -tf
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jinfo
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demo
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javac
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javacjust the compiler
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javap
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jmapinstead of pmap
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and jhat
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demo
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stacktraces :)
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kill -3 <pid>
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demo
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caveat ;-)
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caveat ;-)prints to STDOUT of the running process
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jstack
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caveatsonly at safepoints, one thread at a time
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demo
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jstat
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jstat <metric> <options> PID <interval> <count>
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demo
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custom optionshttp://hg.openjdk.java.net/jdk9/jdk9/jdk/file/d49e247dade6/src/jdk.jcmd/share/
classes/sun/tools/jstat/resources/jstat_options
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jstatd
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jstatdexposes your processes
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jcmd
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jvisualvm
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jmxsh
jmxtermhttp://wiki.cyclopsgroup.org/jmxterm
http://code.google.com/p/jmxsh/
and more
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questions?just shoot!
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Thank you!