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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1571) NetworkServerControlImpl.consoleExceptionPrintTrace() prints stack trace even when logWriter is null
Date Wed, 26 Jul 2006 10:11:16 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1571?page=all ]

Knut Anders Hatlen updated DERBY-1571:

    Attachment: 1571-v2.diff

Uploading a new patch (1571-v2.diff) which replaces the previous patch. Instead of setting
logWriter to null in shutdown(), logWriter is now set to an output stream that throws away
all output. Since the stream is not null, the stack trace will be written to this stream instead
of System.err. This way, all messages (including stack traces) are suppressed while shutdown()
is running ping(), but we preserve the old behaviour with printing stack traces to System.err
when logWriter is null.

I have run derbyall and verified that the patch fixes the regression test failure. Please
review. Thanks!

% svn stat
M      java/drda/org/apache/derby/impl/drda/NetworkServerControlImpl.java

> NetworkServerControlImpl.consoleExceptionPrintTrace() prints stack trace even when logWriter
is null
> ----------------------------------------------------------------------------------------------------
>                 Key: DERBY-1571
>                 URL: http://issues.apache.org/jira/browse/DERBY-1571
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server, Newcomer, Regression Test Failure
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>         Assigned To: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: 1571-v2.diff, 1571.diff
> NetworkServerControlImpl.consoleExceptionPrintTrace() prints the stack
> trace to System.err if logWriter is null. This has occasionally caused
> errors in the regression tests. See
> http://www.multinet.no/~solberg/public/Apache/
> for an example.
> The test failure happens when NetworkServerControlImpl.shutdown() has
> sent the shutdown command and starts a loop calling ping() until it
> gets an error. Since it expects ping() to fail, it sets logWriter to
> null to avoid getting error messages printed on the console.
> In most cases, the network server is already stopped before the first
> call to ping(). Then ping() fails when calling setUpSocket(), and no
> message is printed. On the other hand, if the server is stopped while
> ping() is being executed, the error might occur other places. For
> instance, it might fail with a SocketException in
> fillReplyBuffer(). fillReplyBuffer() then calls clientSocketError(),
> which in turn calls consolePropertyMessage() and
> consoleExceptionPrintTrace().  consolePropertyMessage() correctly
> suppresses the error message, but consoleExceptionPrintTrace() prints
> the stack trace.

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