[ 
https://issues.apache.org/activemq/browse/AMQ-914?page=comments#action_36915 ] 
            
Daniel Aioanei commented on AMQ-914:
------------------------------------

Just got the same problem in the same configuration without running anything 
under a profiler.

INFO  Service                        - Sync error occurred: 
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
INFO  Service                        - Sync error occurred: 
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
INFO  Service                        - Sync error occurred: 
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
INFO  Service                        - Sync error occurred: 
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
INFO  Service                        - Sync error occurred: 
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space

I guess I could specify some larger -xmx value, but because the back end is 
postgres I don't think the number of messages in the queue should have anything 
to do with the amount of memory the ActiveMQ server needs.

> OutOfMemoryError
> ----------------
>
>                 Key: AMQ-914
>                 URL: https://issues.apache.org/activemq/browse/AMQ-914
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 4.0.1
>            Reporter: Daniel Aioanei
>         Attachments: activemq.xml
>
>
> I was doing some testing with a single MDP listening to a queue which had 
> about 247300 messages, with a postgres backend. ActiveMQ server was started 
> using the default activemq startup script (on Linux). In this configuration 
> the cpu normally stays mostly idle and I described this behaviour in another 
> bug report.
> Another issue came to surface when I tried to profile the client application 
> with EclipseColorer to see why a single MDP can't hog my machine. But when I 
> tried so, 4 OutOfMemoryError messages were logged by ActiveMQ server. Note 
> that I was *not* profiling the server, but the client which is a totally 
> different process.

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