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From "Dag H. Wanvik (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-3823) NullPointerException in stress.multi test
Date Mon, 03 Oct 2011 23:47:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119767#comment-13119767
] 

Dag H. Wanvik commented on DERBY-3823:
--------------------------------------

Here is the NPE with line numbers:

java.lang.NullPointerException
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement.getMetaData(EmbedPreparedStatement.java:1095)
        at org.apache.derby.impl.drda.DRDAConnThread.writeSQLDARD(DRDAConnThread.java:6608)
        at org.apache.derby.impl.drda.DRDAConnThread.processCommands(DRDAConnThread.java:1018)
        at org.apache.derby.impl.drda.DRDAConnThread.run(DRDAConnThread.java:295)

this is the line in question in getMetaData:

  if (gcDuringGetMetaData == null || gcDuringGetMetaData.equals(execp.getActivationClass().getName())
== false)
  {
      rMetaData = null;
      gcDuringGetMetaData = execp.getActivationClass().getName(); // <*******************
      
execp is just a cast of preparedStatement which has been accessed earlier in the method, e.g.
preparedStatement.isValid()
so either it has changed under our feet, or it is its activationClass that's null...

                
> 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
>            Reporter: Kathey Marsden
>              Labels: derby_triage10_5_2
>         Attachments: 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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