Can jconsole data be retrieved from the command line?

Question

I am currently using jconsole to monitor performance metrics of my Java application and would like to script this data acquisition

Answer 1

Some other useful CLI tools to monitor a Java applications are:

• Jmxterm which gives full access to all MBeans on the application server, runs interactively or not,
• jmxbox which can only connect through a TCP socket, not directly to a local process with its PID

Answer 2

You might find jvm-mon useful for this. It is a JVM monitoring tool for the command line that disaplys:

• jvm processes
• cpu and GC usage
• heap usage and size
• top threads

The metrics and charts update while the tool is open.

Sample:

Answer 3

Take a look at jmap, which can be used to take a heap dump from the console.

For data not covered in the heap dump, I believe jconsole just uses JMX to connect to the running JVM to get statistics - so it's likely possible to create your own application which could pull those same types of stats from JMX.

Answer 4

You can use this jmx query tool by command line: http://crawler.archive.org/cmdline-jmxclient/

Answer 5

Maybe jvmtop is worth a look.
It's a command-line tool which provides a live-view for several metrics.

Example output of the VM overview mode:

 JvmTop 0.4.1  amd64  8 cpus, Linux 2.6.32-27, load avg 0.12
 http://code.google.com/p/jvmtop

  PID MAIN-CLASS      HPCUR HPMAX NHCUR NHMAX    CPU     GC    VM USERNAME   #T DL
 3370 rapperSimpleApp  165m  455m  109m  176m  0.12%  0.00% S6U37 web        21
11272 ver.resin.Resin [ERROR: Could not attach to VM]
27338 WatchdogManager   11m   28m   23m  130m  0.00%  0.00% S6U37 web        31
19187 m.jvmtop.JvmTop   20m 3544m   13m  130m  0.93%  0.47% S6U37 web        20
16733 artup.Bootstrap  159m  455m  166m  304m  0.12%  0.00% S6U37 web        46

Answer 6

jstack offers a number of useful bits of information in its normal output. Heap memory usage is directly available, broken down by GC region; thread count could be determined with a little bit of perl / grep / etc.