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From "David Jencks (JIRA)" <>
Subject [jira] Commented: (AMQ-1489) discoveryUri in transportConnector and uri in networkConnector partially ignored if multicast
Date Fri, 28 Mar 2008 19:32:32 GMT


David Jencks commented on AMQ-1489:

I'm no expert in how this is supposed to work, but the comment in the trunk code makes me
wonder if the patch is correct.

Without the patch, a URI with ?discoveryURI=foo will result in setting the discoveryURI and
other URIs will use the default.

With the patch, IIUC, the default will never be used.

> discoveryUri in transportConnector and uri in networkConnector partially ignored if multicast
> ---------------------------------------------------------------------------------------------
>                 Key: AMQ-1489
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Connector
>    Affects Versions: 4.1.1
>            Reporter: Gerald Loeffler
>            Assignee: David Jencks
>             Fix For: 4.1.2
> This bug relates to the MulticastDiscoveryAgent and was discovered when 
> 1. the discoveryUri of a transportConnector is a multicast-uri such as
> {code:xml}
> <transportConnector uri="..." discoveryUri="multicast://" />
> {code}
> or
> 2. the uri of a networkConnector is a multicast-uri such as
> {code:xml}
> <networkConnector name="..." uri="multicast://">
> {code}
> In these cases, the uri is partially ignored by the MulticastDiscoveryAgent: the host-name
of the uri ( is extracted and used as the group name by the MulticastDiscoveryAgent.
But the actual multicast group IP is always and the multicast port is always 6155,
regardless of what the actual uri is in the configuration.
> The reason for this is that MulticastDiscoveryAgentFactory creates a new MulticastDiscoveryAgent
and sets the group based on the uri's host, but fails to set the discoveryURI itself. MulticastDiscoveryAgentFactory
should be corrected to do this:
> {code:java}
> MulticastDiscoveryAgent rc = new MulticastDiscoveryAgent();
> rc.setDiscoveryURI(uri); // missing
> rc.setGroup(uri.getHost());
> {code}
> Without the above setting of the discoveryURI the MulticastDiscoveryAgent always uses
the DEFAULT_DISCOVERY_URI_STRING which is "multicast://", explaining the erroneous
behaviour described above.
>   kind regards,
>   gerald

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