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From "Timothy Bish (JIRA)" <>
Subject [jira] [Commented] (AMQ-3359) UDP Transport connector listens on a random port number
Date Tue, 05 Jul 2011 15:11:16 GMT


Timothy Bish commented on AMQ-3359:

After some further investigation this doesn't seem to be an issue.  The broker doesn't call
the constructor that's referenced in this issue when it creates its transport server, it calls
the Constructor taking a wireFormat and port number to bind to.  The constructor referenced
uses the remoteLocation address to connect to the broker as expected.

> UDP Transport connector listens on a random port number
> -------------------------------------------------------
>                 Key: AMQ-3359
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.4.0, 5.4.1, 5.4.2, 5.5.0
>            Reporter: Amir Malekpour
>              Labels: broker, port, transport, udp
>         Attachments: AMQ-3359.patch
>   Original Estimate: 5m
>  Remaining Estimate: 5m
> The broker listens on a random UDP port number instead of the one configure in the URI.
The port number changes each time the broker is restarted. However, the management console
indicates that the broker's listening on the configured port number while it is not the case
(netstat shows another UDP port number). The reason  is that (as seen in the following block)
the UdpTransport constructor does not assign "this.port" from remoteLocation but only reads
the address and leaves "this.port" to be zero. Subsequently, Java API picks any available
port number when it is creating the DatagraSocket. The solution is to add this line: "this.port
= remoteLocation.getPort();" to the following constructor as seen in the accompanying patch.
> public UdpTransport(OpenWireFormat wireFormat, URI remoteLocation) throws UnknownHostException,
IOException {
>         this(wireFormat);
>         this.targetAddress = createAddress(remoteLocation);
>         description = remoteLocation.toString() + "@";
> }

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