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From "Bryan Pendleton (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1114) derbynet/testSecMec.java fails intermittently and test exits mysteriously when server is shutdown as part of the testrun.
Date Thu, 16 Mar 2006 05:09:02 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1114?page=comments#action_12370643 ] 

Bryan Pendleton commented on DERBY-1114:
----------------------------------------

I've been fiddling around with the main loop in testSecMec.java. This loop iterates through
various security mechanisms. For each security mechanism, the loop starts up the Network Server
with that mechanism, runs various tests, then shuts it down.

My findings so far are interesting:
- Re-ordering all the security mechanisms in the loop didn't affect the bug, So it doesn't
seem to have to do with the security mechanism that is used.
- In fact, I altered testSecMec.java so that it just looped 6 times with no security mechanism
at all, and the bug still occurred.
- Lastly, and most interestingly, when the bug occurs, it *always* happens after the second
time through the loop. Never in dozens of reproduced cases has it ever happened after the
3rd or 4th or 5th time through the loop, nor after the first time.

It seems that if the bug is going to happen in my environment, it always happens after the
second time through the loop.


> derbynet/testSecMec.java fails intermittently and test exits mysteriously when server
is shutdown as part of the testrun.
> -------------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-1114
>          URL: http://issues.apache.org/jira/browse/DERBY-1114
>      Project: Derby
>         Type: Bug
>   Components: Network Server, Test
>     Versions: 10.2.0.0
>  Environment: Java Version:    1.4.2_06
> Java Vendor:     Sun Microsystems Inc.
> Java home:       /usr/local/lib/j2sdk1.4.2_06/jre
> OS name:         Linux
> OS architecture: i386
> OS version:      2.4.21-27.0.2.ELsmp
>     Reporter: Sunitha Kambhampati
>     Priority: Minor
>  Attachments: Derby1114.diff.txt
>
> The test derbynet/testSecMec.java fails intermittently in a strange way that the test
actually exits before finishing the full test. 
> This issue was noticed by Bryan when he ran derbyall with the derby-1080 fix. Some discussion
and analysis that has been done is in Derby-1080. Please read comments in DERBY-1080. Some
main links in
> http://issues.apache.org/jira/browse/DERBY-1080#action_12370260
> http://issues.apache.org/jira/browse/DERBY-1080#action_12370374
> In short: the test does some switching of System.out and System.err streams before calling
networkserver.shutdown. This code was added to this test as part of fix for derby-273.   for
some reason, the networkserver.shutdown call makes the test to exit.  One theory is that the
network server.shutdown is causing the standard out streams to close and thus the test exits.
> -- Need to investigate what is the cause for this intermittent failure and how/why  networkserver.shutdown
is closing the stream or making the test to exit prematurely.

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