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https://issues.apache.org/jira/browse/LUCENE-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless reopened LUCENE-2338:
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bq. Were all tests already converted to not supress exceptions in threads? This 
is why the issue is still open...

Oh, woops: I don't know!

Reopening...
                
> Some tests catch Exceptions in separate threads and just print a stack trace 
> - the test does not fail
> -----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2338
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2338
>             Project: Lucene - Java
>          Issue Type: Test
>          Components: general/build
>            Reporter: Uwe Schindler
>             Fix For: 3.6, 4.0
>
>
> Some tests catch Exceptions in separate threads and just print a stack trace 
> - the test does not fail. The test should fail. Since LUCENE-2274, the 
> LuceneTestCase(J4) class installs an UncaughtExceptionHandler, so this type 
> of catching and solely printing a Stack trace is a bad idea. Problem is, that 
> the run() method of threads is not allowed to throw checked Exceptions.
> Two possibilities:
> - Catch checked Exceptions in the run() method and wrap into RuntimeException 
> or call Assert.fail() instead
> - Use Executors

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