(Slightly OT) Telling exactly which objects get promoted

David Holmes David.Holmes at oracle.com
Thu Apr 8 03:56:17 PDT 2010

At the risk of stating the obvious take a look at the various tools 
mentioned in the troubleshooting guide:


jconsole, jhat, VisualVM ....

Hopefully one of those can assist.

David Holmes

Ben Evans said the following on 04/08/10 20:26:
> Hi,
> Apologies if this is too off-topic, or is covered in a document which my 
> Google-Foo has been insufficient to locate so far.
> I have an application which is displaying an odd collection pattern on 
> large heaps (3G on a 32-bit 6u18). Broadly, all our objects are 
> sufficiently short-lived that we don't expect any of them to survive to 
> tenure, and yet a small amount of them seem to, so over time we are 
> unable to completely avoid full collections.
> We would like some tool or JVM setting which would allow us to see 
> exactly which objects (or failing that, their classes) are reaching 
> tenure. Can anyone suggest something suitable, or some docs?
> Thanks,
> Ben
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> Ben Evans
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