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https://issues.apache.org/jira/browse/LUCENE-4252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422154#comment-13422154
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Dawid Weiss commented on LUCENE-4252:
-------------------------------------
Static initializers will be very difficult because they're executed before the
actual test begins (a side effect of JUnit architecture). You could roll out
each test in a separate class loader to overcome this but it'd create large
overhead on memory (class GCs, reinitializations, etc.).
I like this nonetheless - it should catch a lot of common use case scenarios.
Things like initializing static variables in other classes (or thread locals)
will remain a problem but we can probably deal with these later on somehow.
The only thing is that I'd rather move it to a separate class (and add it to
the class rule chain). While it may seem like adding unnecessary complexity
putting all the checks in a single rule will eventually lead to a tangled blob
that is hard to read and analyze.
I may do it when I come back, Robert -- assign to me or create a new issue.
> Detect/Fail tests when they leak RAM in static fields
> -----------------------------------------------------
>
> Key: LUCENE-4252
> URL: https://issues.apache.org/jira/browse/LUCENE-4252
> Project: Lucene - Core
> Issue Type: Test
> Components: general/test
> Reporter: Robert Muir
> Attachments: LUCENE-4252.patch
>
>
> We run our junit tests without firing up a JVM each time.
> But some tests initialize lots of stuff in @BeforeClass and don't properly
> null it out in an @AfterClass, which can cause a subsequent test in the same
> JVM to OOM, which is difficult to debug.
> Inspiration for this was me committing Mike's cool TestPostingsFormat, which
> forgot to do this: then we were seeing OOMs in several jenkins runs.
> We should try to detect these leaks in LuceneTestCase with RAMUsageEstimator
> and fail the test.
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