[jboss-jira] [JBoss JIRA] Closed: (JBAS-3792) Better error reporting when messages "mysteriously" vanish

[Adrian Brock (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBAS-3792?page=all ]

Adrian Brock closed JBAS-3792.
------------------------------

    Fix Version/s: JBossAS-5.0.0.Beta2
                   JBossAS-4.0.5.SP1 
       Resolution: Done

I have attached the following FAQ explanation to the error message.
I also include this text when a "delete" fails.

   /** FAQ about concurrency problems */
   private static String CONCURRENCY_WARNING = "\nCommon reasons for missing messages are \n1) You have multiple JBossMQs running over the same database.\n2) You are using a replicating database that is not keeping up with replication.";


> Better error reporting when messages "mysteriously" vanish
> ----------------------------------------------------------
>
>                 Key: JBAS-3792
>                 URL: http://jira.jboss.com/jira/browse/JBAS-3792
>             Project: JBoss Application Server
>          Issue Type: Sub-task
>      Security Level: Public(Everyone can see) 
>          Components: JMS service
>    Affects Versions: JBossAS-4.0.5.GA
>            Reporter: Adrian Brock
>         Assigned To: Adrian Brock
>             Fix For: JBossAS-5.0.0.Beta2, JBossAS-4.2.0.GA, JBossAS-4.0.5.SP1 
>
>
> It is commonly the case that people try to run two instances of JBossMQ against the same
> database tables. This can lead to errors like the ones in the parent task or a similar message
> in the delete when doing acknowledgements.
> These error messages need improving and also give a hint to the possible reasons,
> e.g. 
> 1) competing JBossMQs trying to share the same database
> 2) trying to use a replicating database that does not support synchronous replication (i..e there
> is a delay in a row getting written to one database before it appears in the other database)
> The parent issue's error message belongs in org.jboss.mq.pm.jdbc2.PersistenceManager
>    public SpyMessage loadFromStorage(MessageReference messageRef) throws JMSException
>    {
> ...
>          rs = stmt.executeQuery();
>          if (rs.next())
>             return extractMessage(rs);
> +      else
>             throw new JMSException("Unable to load message " + messageRef + " from storage, are you trying to share database tables between JBossMQ instances? Are you using a replicating database that does not support synchronous replication?");
> -         return null;

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