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Posted to issues@activemq.apache.org by "Justin Bertram (Jira)" <ji...@apache.org> on 2025/07/29 20:24:00 UTC

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

Justin Bertram created ARTEMIS-5598:
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             Summary: 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


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$BrowserDeliverer.run(ServerConsumerImpl.java:1488)
    at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:57)
    at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:32)
    at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:68)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118){noformat}



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