I've been having a look at configuring the jms endpoint to make the
subscription durable, but I think the one who has to make it durable
should be the consumer, who will live in machine B without ServiceMix,
so I don't think the endpoint configuration is the problem.
Something strange is happening:
- On machine A's jConsole, I see there is just 1 consumer (that I know
is the one on machine A), so the one on machine B doesn't appear,
while machine B's jConsole says my topic has 2 consumers.
- On machines A and B, I can read the messages sent from machine B,
but the messages sent from machine A are only seen on A's jConsole.
Any idea why these inconsistencies occur?
Sebastian Gomez.
On Thu, Mar 27, 2008 at 12:40 AM, Sebastian Gomez <[EMAIL PROTECTED]> wrote:
> Thanks for the reply. You follow me 100% :) I only want to emphasize
> that machine B doesn't have ServiceMix installed, in case it is not
> clear.
>
> Until now I didn't know you could configure the topics to be durable
> in ServiceMix, but I have just seen the new JMS endpoints section on
> the web and it seems it's not very complicated. I'll try it and see if
> it resolves my problem.
>
> The strange thing is that using JConsole on machine A, I can see the
> messages are being persisted, but on machine B I just get to see that
> the topic exists, but it seems to be empty. The Topic says it has 2
> consumers, so I understand both A and B should see the messages. Maybe
> I'm missing something out to make B subscribe to the Topic. How can I
> make sure it is subscribed?
>
> Thanks again.
>
> Sebastian Gomez.
>
>
> On 3/26/08, Bruce Snyder <[EMAIL PROTECTED]> wrote:
> > On Wed, Mar 26, 2008 at 1:45 PM, Sebastian Gomez <[EMAIL PROTECTED]> wrote:
> > > Hello.
> > >
> > > I've found a new obstacle in my project using ServiceMix: I am trying
> > > to read the messages sent to an ActiveMQ Topic defined in ServiceMix
> > > from a remote machine. I've tried looking for the messages using the
> > > ActiveMQ WebBrowser and the JConsole, but it seems the topics don't
> > > receive any messages (although the topic does appear, empty). In my
> > > machine executing ServiceMix I am able to see the messages perfectly
> > > stored in the queue, so the problem comes when connecting remotely,
> > > not when persisting. I've tried connecting to the ServiceMix queue
> > > before, during, and after message persistence in case I was not
> > > receiving the messages because of subscribing too late to the topic,
> > > but whatever the scenario my queue in the remote machine is blank.
> > >
> > > I've tried various configuration in the activemq.xml file of the
> > > remote machine, but without success. Maybe the problem is there, I am
> > > quite new to ActiveMQ, I have read a few guides already, but maybe my
> > > knowledge is insufficient yet.
> > >
> > > I've run out of ideas, so I'm willing to try out anything that you
> > > think could work.
> >
> > OK, I'm not sure I follow you 100%, so let ask some questions.
> >
> > So you are sending messages to an ActiveMQ topic inside of ServiceMix
> > on machine A. Then you try to read the messages from the same ActiveMQ
> > topic inside of ServiceMix from machine B and there are no messages.
> > Correct?
> >
> > First off, topics are not going to hold messages if there is no active
> > subscriber unless you configure the subscription to be durable. If the
> > subscription is durable, then the broker will hold all messages for a
> > given consumer while it is offline. That way when it comes back online
> > it will receive all the messages to the topic while it was gone. Are
> > you using durable subscriptions?
> >
> > The easiest way to see what's happening is via Jconsole on machine A.
> > Jconsole will display the consumerCount, the enqueueCount, the
> > dequeueCount, etc. This will tell you if any messages have flowed
> > through the topic.
> >
> > Bruce
> > --
> > perl -e 'print unpack("u30","D0G)[EMAIL
> > PROTECTED]&5R\"F)R=6-E+G-N>61E<D\!G;6%I;\"YC;VT*"
> > );'
> >
> > Apache ActiveMQ - http://activemq.org/
> > Apache Camel - http://activemq.org/camel/
> > Apache ServiceMix - http://servicemix.org/
> > Apache Geronimo - http://geronimo.apache.org/
> >
> > Blog: http://bruceblog.org/
> >
>
