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https://issues.apache.org/jira/browse/CASSANDRA-16101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17194494#comment-17194494
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David Capwell commented on CASSANDRA-16101:
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bq. I did this first, but then thought we could just catch any exceptions and 
ignore them if expected, do you have an example where this would not be enough?

I was thinking about the repair tests which trigger failures by design.  Since 
repair uses JMXEnabledThreadPoolExecutor any thrown exception will be handled 
in org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor#handleOrLog 
which calls 

{code:java}
Thread.getDefaultUncaughtExceptionHandler().uncaughtException(Thread.currentThread(),
 t);
{code}

so they should cause that list to be non-empty.  

bq. thought we could just catch any exceptions and ignore them if expected

I may be thinking about this differently than you, but not sure how the test 
can catch and ignore them.  The one thing that seems possible is if I try to 
remove them from the list before the test ends (it is copy-on-write so I can 
try to remove).  In the repair tests we reuse the cluster, so would need to 
wrap every test with a try/finally to attempt to cleanup expected exceptions.

> Make sure we don't throw any uncaught exceptions during in-jvm dtests
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-16101
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16101
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Test/dtest/java
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Normal
>
> We should assert that we don't throw any uncaught exceptions when running 
> in-jvm dtests



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