Jmap -heap on all OpenJDK 1.7.79+ on Linux x86_64 crash

[Matthew Patton]

> I ran across this bug report (https://bugs.launchpad.net/ubuntu/+source/openjdk-7/+bug/1548434) and it seems in Wheezy/Jessie it's likewise. The last functional version I just so happened to hold onto is 7u79-2.5.5-1~deb7u1.
>
>  The following are confirmed to throw an Exception
>   * 7u111-2.6.7-2~deb8
>   * 7u121-2.6.8-1~deb7u1
>   * 7u95-2.6.4-1~deb7u1
>
> Here is an example run with 7u121 -  http://pastebin.com/tzRk7xTH

I can confirm that on RHEL family distributions it occurs as well even with 131 which came out a couple weeks ago. Additionally it would be tremendously helpful if 'jmap' were moved back into the main package and not relegated to -devel. It is a tremendously useful program for day to day operations.

Linux ip-172-17-0-41 4.4.44-39.55.amzn1.x86_64 #1 SMP Mon Jan 30 18:15:53 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
java-1.7.0-openjdk-1.7.0.131-2.6.9.0.71.amzn1.x86_64
java-1.7.0-openjdk-devel-1.7.0.131-2.6.9.0.71.amzn1.x86_64


# jmap -heap 2436
Attaching to process ID 2436, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.131-b00

using thread-local object allocation.
Garbage-First (G1) GC with 2 thread(s)

Heap Configuration:
   MinHeapFreeRatio = 25
   MaxHeapFreeRatio = 70
   MaxHeapSize      = 2684354560 (2560.0MB)
   NewSize          = 1363144 (1.2999954223632812MB)
   MaxNewSize       = 17592186044415 MB
   OldSize          = 5452592 (5.1999969482421875MB)
   NewRatio         = 2
   SurvivorRatio    = 5
   PermSize         = 402653184 (384.0MB)
   MaxPermSize      = 536870912 (512.0MB)
   G1HeapRegionSize = 1048576 (1.0MB)

Heap Usage:
Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at sun.tools.jmap.JMap.runTool(JMap.java:197)
        at sun.tools.jmap.JMap.main(JMap.java:128)
Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap
        at sun.jvm.hotspot.tools.HeapSummary.run(HeapSummary.java:146)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
        at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:40)
        ... 6 more

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