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https://issues.apache.org/jira/browse/DERBY-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126252#comment-13126252
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Dag H. Wanvik commented on DERBY-3823:
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Thanks for helping me understand this, Mamta! From you test program it appears
that the metadata returned even in the client case is still correct (i.e. c12's
size is still 5) . Since that's the result set we are processing (still), I
think that is correct even though the underlying table now has length 8. I was
worried we might somehow be able to retrieve the new values, 8, while still
reading the "old" style result set on the client. Isn't metadata cached on the
client also? If so the second call to "rsmd = rs.getMetaData();" may not even
visit the server, unless you trace it to determine that it did.. I will try to
tweak your program and debug to see if I can provoke it to return "8" while we
are still reading the result set that has 5 as max lenght for c12... If that
were possible it would be an error, I think. That fact that we are able to
*insert* longer data than 5 is not wrong, since the underlying database has
changed. I believe *database* metadata would correctly reflect that? But the
*result set* metadata should stick to the actual data in the (old) result set I
believe.
> NullPointerException in stress.multi test
> -----------------------------------------
>
> Key: DERBY-3823
> URL: https://issues.apache.org/jira/browse/DERBY-3823
> Project: Derby
> Issue Type: Bug
> Components: Network Server
> Affects Versions: 10.3.3.1, 10.7.1.1, 10.8.1.2
> Reporter: Kathey Marsden
> Labels: derby_triage10_5_2
> Attachments: d3823-1.diff, derby.log
>
>
> I saw the following NPE in stress.multi running on 10.3 with derbyclient.
> java.lang.NullPointerException
> at
> org.apache.derby.impl.jdbc.EmbedPreparedStatement.getMetaData(Unknown
> Source)
> at org.apache.derby.impl.drda.DRDAConnThread.writeSQLDARD(Unknown
> Source
> )
> at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown
> Sou
> rce)
> at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
> Cleanup action completed
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