activemq-cpp Access violation closing consumer session object

[timplusplus <Ro...@yahoo.com>]

Hi everyone,

I have a working C++ client built off of ActiveMQ-CPP 2.4 (WindowsXP,
MSVC++, APR 1.3.3) which connects to a standalone ActiveMQ server (5.1.0),
can publish messages, subscribe to messages and disconnect just fine.  

I have attempted to construct my own reconnecton mechanism and for the most
part have it working pretty well.  I have my C++ client publishing messages
(1 per second) to the server where a Java client subscribes to them.  I also
have a script that forcefully kills/restarts my ActiveMQ server every 60
seconds.

My problem is with the C++ client disconnecting after a forceful kill of the
ActiveMQ server.  Every once in a while during the delete( consumerSession
); call, a Windows exception: "Unhandled Exception!  Access Violation!" will
occur.  

It seems that at some point during these disconnections, there is a dangling
pointer left in my consumerSession object.  During the
ActiveMQSession::close() method,  cms::Closeable Iterator attempts to
access:  iter->next()   and the Access Violation exception is thrown.  


My first question to anyone kind enough to read all this is have any of you
ever experienced anything similar?  

One of my biggest problems is that replication of this issue is quite
difficult.  For the most part, the disconnect/reconnect functionality I have
works great.  EVery now and then (I am thinking it's bad timing somewhere),
I get this exception trying to close the consumerSession's closeables.  


If anyone wants more info (more explanation, snippets, etc...)  please let
me know.

Thanks,

Tim
-- 
View this message in context: http://www.nabble.com/activemq-cpp-Access-violation-closing-consumer-session-object-tp22380172p22380172.html
Sent from the ActiveMQ - User mailing list archive at Nabble.com.

Re: activemq-cpp Access violation closing consumer session object

[Timothy Bish <ta...@gmail.com>]

On Fri, 2009-03-06 at 12:45 -0800, timplusplus wrote:
> Hi everyone,
> 
> I have a working C++ client built off of ActiveMQ-CPP 2.4 (WindowsXP,
> MSVC++, APR 1.3.3) which connects to a standalone ActiveMQ server (5.1.0),
> can publish messages, subscribe to messages and disconnect just fine.  
> 
> I have attempted to construct my own reconnecton mechanism and for the most
> part have it working pretty well.  I have my C++ client publishing messages
> (1 per second) to the server where a Java client subscribes to them.  I also
> have a script that forcefully kills/restarts my ActiveMQ server every 60
> seconds.
> 
> My problem is with the C++ client disconnecting after a forceful kill of the
> ActiveMQ server.  Every once in a while during the delete( consumerSession
> ); call, a Windows exception: "Unhandled Exception!  Access Violation!" will
> occur.  
> 
> It seems that at some point during these disconnections, there is a dangling
> pointer left in my consumerSession object.  During the
> ActiveMQSession::close() method,  cms::Closeable Iterator attempts to
> access:  iter->next()   and the Access Violation exception is thrown.  
> 
> 
> My first question to anyone kind enough to read all this is have any of you
> ever experienced anything similar?  
> 
> One of my biggest problems is that replication of this issue is quite
> difficult.  For the most part, the disconnect/reconnect functionality I have
> works great.  EVery now and then (I am thinking it's bad timing somewhere),
> I get this exception trying to close the consumerSession's closeables.  
> 
> 
> If anyone wants more info (more explanation, snippets, etc...)  please let
> me know.
> 

You are welcome to open a new Jira issue on this and attach any code
snippets or stack traces that you have.  

Regards
Tim.

-- 
Tim Bish
http://fusesource.com
http://timbish.blogspot.com/