> 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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