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How to generate Java Heap Dump?

Posted on 2009-07-07
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Hi,
I want to generate Java Heap Dump to detect Memory Leak. Although I am able to generate Javacore files I could not generate heapdump files. I am using IBM Websphere 6.1 on Windows.

I did following settings:
Navigated to: Servers > Application Servers > Server1 (or the name of
      the server to get a heap dump) > Process Definition > Environment Entries

Then set following properties:
IBM_HEAPDUMP = true
IBM_HEAP_DUMP = true
IBM_JAVA_HEAPDUMP_TEXT=true
IBM_HEAPDUMP_OUTOFMEMORY=false
JAVA_DUMP_OPTS=ONANYSIGNAL(JAVADUMP[5],HEAPDUMP[5])

Then I am running following commands in command prompt:
wsadmin> set jvm [$AdminControl completeObjectName type=JVM,*]
wsadmin> $AdminControl invoke $jvm dumpThreads


Am I missing something?
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Question by:cuttieveenz
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Expert Comment

by:ChristoferDutz
ID: 24801654
This link shoud help you configure what you want ... I hope IBM presents you the page in engish though ... as the german is sometimes rather bad, I would think it automatically translates.

http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic=/com.ibm.websphere.express.doc/info/exp/ae/tprf_enablingheapdump.html
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LVL 41

Expert Comment

by:HonorGod
ID: 24803208
The simple answer is that it depends upon your operating system (OS).

For example

Windows:
  http://www.IBM.com/support/docview.wss?rs=180&uid=swg21384926

Aix & Linux:
  http://www.IBM.com/support/docview.wss?rs=180&uid=swg21297060

Solaris:
  http://www.IBM.com/support/docview.wss?rs=180&uid=swg21321546
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LVL 41

Expert Comment

by:HonorGod
ID: 24803878
It looks like you tried the instructions from

http://www.IBM.com/support/docview.wss?rs=180&uid=swg21384926

After this command:

wsadmin> set jvm [$AdminControl completeObjectName type=JVM,*]

use this one to show the current value of the "jvm" variable:

wsadmin> puts $jvm

What does it show?

Personally, I prefer to use Jython (which is available in a more robust form in v 6.1 and v7.0).
The Jython statements for these commands would be:

1. add "-lang jython" to the command line options used to start wsadmin
    e.g., "wsadmin -lang jython"

2. jvm = AdminControl.completeObjectName( 'type=JVM,*' );
    wsadmin> jvm = AdminControl.completeObjectName( 'type=JVM,*' );

3. print the value of the jvm variable (note the lack of '$' for jython variables):
    wsadmin> print jvm
    WebSphere:name=JVM,process=server1,platform=proxy,node=ragweed01Node,j2eeType=JVM,J2EEServer=server1,version=7.0.0.3,type=JVM,mbeanIdentifier=JVM,cell=ragweed01Cell,spec=1.0

4. call (invoke) the dumpThreads routine

  Then, look for the javacore file.  I found mine under <WAS_HOME>\profiles\<profileName>, specifically:

> dir D:\IBM\WebSphere\AppServer70\profiles\AppSrv00\javacore*.txt

 Directory of D:\IBM\WebSphere\AppServer70\profiles\AppSrv00

07/08/2009  10:00 AM         2,193,629 javacore.20090708.100003.872.0001.txt

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Accepted Solution

by:
cuttieveenz earned 0 total points
ID: 24811322
We figured out why we couldn't generate Heap dumps. Instead of running the following command:
 
$AdminControl invoke $jvm dumpThreads
 
The following should be run:
$AdminControl invoke $jvm generateHeapDump
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LVL 41

Expert Comment

by:HonorGod
ID: 24812760
Right, the dumpThreads would be used to create a javacore
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LVL 41

Expert Comment

by:HonorGod
ID: 24831041
Sorry I misunderstood the request.

Anything else?
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