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From "Christopher L. Shannon (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (AMQ-6981) Concurrent access to ActiveMQTextMessage getText() can lead to null when using VMTransport
Date Thu, 31 May 2018 13:51:00 GMT

    [ https://issues.apache.org/jira/browse/AMQ-6981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16496569#comment-16496569
] 

Christopher L. Shannon edited comment on AMQ-6981 at 5/31/18 1:50 PM:
----------------------------------------------------------------------

I forgot that when using the VM transport the message is supposed to be copied on dispatch
inside ActiveMQConnection so this may not be the exact issue, I need to look at it a bit more.


was (Author: christopher.l.shannon):
I forgot that when using the VM transport the message is supposed to be copied on dispatch
isnide ActiveMQConnection so this may not be the exact issue, I need to look at it a bit more.

> Concurrent access to ActiveMQTextMessage getText() can lead to null when using VMTransport
> ------------------------------------------------------------------------------------------
>
>                 Key: AMQ-6981
>                 URL: https://issues.apache.org/jira/browse/AMQ-6981
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker, JMS client
>    Affects Versions: 5.15.4
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>            Priority: Major
>             Fix For: 5.16.0, 5.15.5
>
>         Attachments: NullMessageTest.java
>
>
> The issue occurs when using the VM transport to access the text of the ActiveMQTextMsesage
and the getText() method has to unmarshall data back into text from the byte sequence. 
>  
> The main problem is when there are multiple threads at the same time calling getText()
on the text message there is a race condition where the content can be nulled out before
finishing setting the text.
>  
> This is probably an issue with other message types besides a text message as well.



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