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[Brunet Thibaut <t.brunet@xxxxxxxxxxx>]

Anyone found a workaround ?

Why this bug as no priority and is not assigned ? Nobody needs jmap and
heap dump ?

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https://bugs.launchpad.net/bugs/1548434

Title:
  jmap -heap broken since update to 7u95-2.6.4-0ubuntu0.14.04.1

Status in openjdk-7 package in Ubuntu:
  Confirmed

Bug description:
  The jmap -heap <pid> command is broken since the update to
  7u95-2.6.4-0ubuntu0.14.04.1

  Given a tomcat process running with openjdk-7 under a non-root user.

  Before that update sudo jmap -heap <pid> gave output about heap configured on top + also the heap usage inside each reason of the java heap (eden, old gen, permgen) etc...
  Note: running as root is and was required even before to get the '-heap' option to work. Where as running 'jmap -dump:file' only works when running as user the jvm runs under and not root. That just as context as it is strange behavior of jmap since a long time.

  After the update to the specified version only the intro is shown and
  instead of the usage the following error:

  Attaching to process ID 1571, please wait...
  Debugger attached successfully.
  Server compiler detected.
  JVM version is 24.95-b01

  using thread-local object allocation.
  Parallel GC with 2 thread(s)

  Heap Configuration:
     MinHeapFreeRatio = 0
     MaxHeapFreeRatio = 100
     MaxHeapSize      = 1363148800 (1300.0MB)
     NewSize          = 1310720 (1.25MB)
     MaxNewSize       = 17592186044415 MB
     OldSize          = 5439488 (5.1875MB)
     NewRatio         = 2
     SurvivorRatio    = 8
     PermSize         = 21757952 (20.75MB)
     MaxPermSize      = 268435456 (256.0MB)
     G1HeapRegionSize = 0 (0.0MB)

  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

  
  The last version before we noticed that bug was:
  7u91-2.6.3-0ubuntu0.14.04.1

  Not 100% sure that this exact version still worked but quite sure.

  We could reproduce the issue in 2 different servers both running 14.04
  LTS 64bit

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