Setting the number of consumers for a topic

Hi,
I have a topic connection factory from which I can creating 2 topic connections and setting different clientids for each connection to one topic.But I get a error com.sun.messaging.jms.ResourceAllocationException: [C4073]: A JMS destination limit was reached. Too many Subscribers/Receivers for Topic : usmTopic user=guest, broker=localhost:7676(4227).Is there a limit on the number of subscribers I can have for a topic?..I could not find any configuration for this?..Or can I have only 1 connection to a topic?
Not sure I understand what is happening?
Thanks
Reshma

Yes, using multiple connections is more resource consuming. And from the description below, it looks like it wouldn't help. A small info first. The Client ID in topics is used to keep the messages for the consumers when they are disconnected (hence durable subscribers). For this, if consumers were to be able to share the same clientid, the broker wouldn't know which consumer has consumed the messages and which has not. So for this, each consumer has to have a distinct client id. Usually, I provided the client id programmatically, but because of your problem, I saw that there is another solution. Read on...
From the 3.6 admin guide (must still apply with 4.1):
If multiple clients obtain connections from the same connection factory object, set ClientID for a connection factory. Message Queue can then provide a unique ClientID for each connection obtained from that factory.
So, this is what you have done. Here is the rest of the instructions....
+To ensure a unique ClientID value, set the imqConfiguredClientID attribute using the following format: imqConfiguredClientID=$string. The ${u} must be the first four characters of the attribute value. If anything other than �u� is encountered, a JMS exception occurs upon connection creation.+
Sounds like what you are seeing no?
+The value for string is any value that you want to associate with a connection produced by this connection factory, such as Xconn. During the user authentication stage, Message Queue substitutes u:userName for u. For example, if the user associated with the connection is Athena and the string specified for the connection is ${u}Xconn, the ClientID will be u:AthenaXconn. This scheme ensures that each connection produced by a connection factory, although identical in every other way, will contain a unique ClientID.+
The following may also apply to you, based on the exception you provided...
+There is one case in which this scheme will not work: If two clients obtain a connection using a default user name such as guest, each will have a ClientID with the same ${u} component. At runtime, the first client to request the connection will get it; the second will not because MQ cannot create a connection with a non-unique ClientID.+
So from this:
1. Use the {u} in your connection id.
2. Use different users than the default. Unless you are using an external ldap provider, you probably need to use iqmusermgr. This will be in the bin directory of the Sun MQ installation.
HTH
TE

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Yvan KOENIG (VALLAURIS, France) dimanche 4 septembre 2011 21:27:41
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.0
My iDisk is : <http://public.me.com/koenigyvan>
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