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Posted to issues@activemq.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2025/07/29 20:31:00 UTC

[jira] [Work logged] (ARTEMIS-5598) Mitigate race condition on ServerConsumer callback

     [ https://issues.apache.org/jira/browse/ARTEMIS-5598?focusedWorklogId=976848&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-976848 ]

ASF GitHub Bot logged work on ARTEMIS-5598:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 29/Jul/25 20:30
            Start Date: 29/Jul/25 20:30
    Worklog Time Spent: 10m 
      Work Description: jbertram opened a new pull request, #5848:
URL: https://github.com/apache/activemq-artemis/pull/5848

   No test here as the cause of & solution for the NPE is determined by static analysis.




Issue Time Tracking
-------------------

            Worklog Id:     (was: 976848)
    Remaining Estimate: 0h
            Time Spent: 10m

> Mitigate race condition on ServerConsumer callback
> --------------------------------------------------
>
>                 Key: ARTEMIS-5598
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-5598
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>            Reporter: Justin Bertram
>            Assignee: Justin Bertram
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> There is a race condition in {{ServerConsumerImpl}} involving {{callback}} which can result in a {{NullPointerException}}, e.g.:
> {noformat}
> java.lang.NullPointerException
>     at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.proceedDeliver(ServerConsumerImpl.java:532)
>     at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl$BrowserDeliverer.run(ServerConsumerImpl.java:1488)
>     at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:57)
>     at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:32)
>     at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:68)
>     at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
>     at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
>     at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118){noformat}
> The race happens when a message is being delivered at the same time the consumer is closed.



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