[ https://issues.apache.org/jira/browse/LUCENE-8642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16745015#comment-16745015 ] 

Uwe Schindler commented on LUCENE-8642:
---------------------------------------

I think the approach is fine, we just need more test runs to catch all problems with the new approach.

> RamUsageTester.sizeOf ignores arrays and collections if --illegal-access=deny
> -----------------------------------------------------------------------------
>
>                 Key: LUCENE-8642
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8642
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Minor
>             Fix For: master (9.0)
>
>
> We have a silent fall-through on catch clause there if a field is inaccessible. This causes all collections to not be recursively descended into.
> We could hack it so that collection objects are counted "manually". Or we could propagate illegal access exception from ram tester, detect which tests/ objects do try to measure collection objects and either remove them (if it's not possible to measure accurately) or change them (if it is possible to estimate the size in a different way).
> Looking for feedback on this one.



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