RFR(s): 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details

[Thomas Stüfe]

All tests passed on jdk-submit.

Anyone interested in a review?

More output examples for jcmd VM.classloaders :

Spring framework, basic tree:
http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/example_spring_short.txt

Spring framework, including all classes:
http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/example_spring_long.txt

... Thomas

On Wed, May 23, 2018 at 2:46 PM, Thomas Stüfe <thomas.stuefe at gmail.com> wrote:
> Dear all,
>
> (not sure if this would be a serviceability or runtime rfe, so sorry
> for crossposting)
>
> may I please have feedback/reviews for this small enhancement.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8203682
> Webrev: http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/webrev.00/webrev/
>
> This adds a new command to jcmd, "VM.classloaders". It complements the
> existing command "VM.classloader_stats".
>
> This command, in its simplest form, prints the class loader tree. In
> addition to that, it optionally prints out loaded classes (both
> non-anonymous and anonymous) and various classloader specific
> information.
>
> Examples:
>
> http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/example.txt
> http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/example-with-classes.txt
> http://cr.openjdk.java.net/~stuefe/webrevs/8203682-jcmd-print-classloader-hierarchy/example-with-reflection-and-noinflation.txt
>
>
> Thanks and Best Regards,
>
> Thomas