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From "Manuel Teira (JIRA)" <>
Subject [jira] Commented: (AMQ-1187) Messages sent in parallel threads may not be enqueued
Date Thu, 28 Jun 2007 10:45:32 GMT


Manuel Teira commented on AMQ-1187:

I think the problem is that you're using the same Session object from different threads. This
is not the intended usage, if you read the JMS API Specification, it says:

A Session object is a single-threaded context for producing and consuming messages. Although
it may allocate provider resources outside the Java virtual machine (JVM), it is considered
a lightweight JMS object.

and also:

Once a connection has been started, any session with one or more registered message listeners
is dedicated to the thread of control that delivers messages to it. It is erroneous for client
code to use this session or any of its constituent objects from another thread of control.
The only exception to this rule is the use of the session or connection close method.

What I deduce from this, is that you need a different session for any of your producer and
consumer threads.

> Messages sent in parallel threads may not be enqueued
> -----------------------------------------------------
>                 Key: AMQ-1187
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 4.0.2, 4.1.0
>         Environment: Linux 
>            Reporter: Philippe Göllnitz
>         Attachments: console.txt, jconsole.png,,
> I sent 1000 messages in own threads but monitoring the queue with jconsole sometimes
only 999 are in the queue. 
> This happens more likely if you raise the number of sent messages 10.000 or 100.000 but
can also happen if set to 100.

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