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         <div id="-middle-content">
           <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.5.&#160;Closing client connections on unroutable mandatory messages</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Handling-Undeliverable-Messages.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;9.&#160;Runtime</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-Runtime-Flow-To-Disk.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route"></a>9.5.&#160;Closing client connections on unroutable mandatory messages</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route-Summary"></a>9.5.1.&#160;Summary</h3></div></div></div><p>
         Due to asynchronous nature of AMQP 0-8/0-9/0-9-1 protocols sending a message with a routing key for which no queue binding exist results
         in either message being bounced back (if it is mandatory or immediate) or discarded on broker side otherwise.
     </p><p>
         When a 'mandatory' message is returned, the Apache Qpid JMS AMQP 0-x clients conveys this by delivering
         an <span class="emphasis"><em>AMQNoRouteException</em></span> through the configured ExceptionListener on the Connection.
         This does not cause channel or connection closure, however it requires a special exception handling
         on client side in order to deal with <span class="emphasis"><em>AMQNoRouteExceptions</em></span>.
         This could potentially be a problem when using various messaging frameworks (e.g. Mule)
         as they usually close the connection on receiving any JMSException.
     </p><p>
         In order to simplify application handling of scenarios where 'mandatory' messages
         are being sent to queues which do not actually exist, the Apache Qpid Broker-J can be configured such that
         it will respond to this situation by closing the connection
         rather than returning the unroutable message to the client as it normally should.
         From the application perspective, this will result in failure of synchronous operations in progress such as a session commit() call.
     </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>This feature affects only transacted sessions.</p><p>
            By default, the Apache Qpid JMS AMQP 0-x produces mandatory messages when using queue destinations.  Topic
            destinations produce 'non-mandatory' messages.
         </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route-Configuration"></a>9.5.2.&#160;Configuring
         <span class="emphasis"><em>closeWhenNoRoute</em></span>
     </h3></div></div></div><p>
         The Port attribute <span class="emphasis"><em>closeWhenNoRoute</em></span> can be set to specify this feature on broker side.
         By default, it is turned on. Setting <span class="emphasis"><em>closeWhenNoRoute</em></span> to <span class="emphasis"><em>false</em></span> switches
         it off.
     </p><p>See the <a class="link" href="../../jms-client-0-8/book/JMS-Client-0-8-Connection-URL.html" target="_top">Qpid JMS AMQP 0-x client
           documentation</a> for details of enabling this feature client side.
       </p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Handling-Undeliverable-Messages.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Runtime.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-Runtime-Flow-To-Disk.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.4.&#160;Handing Undeliverable Messages&#160;</td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%">&#160;9.6.&#160;Flow to Disk</td></tr></table></div></div>

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	<div id="-middle-content">
	<div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.5. Closing client connections on unroutable mandatory messages</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Handling-Undeliverable-Messages.html">Prev</a> </td><th align="center" width="60%">Chapter 9. Runtime</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Runtime-Flow-To-Disk.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route"></a>9.5. Closing client connections on unroutable mandatory messages</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route-Summary"></a>9.5.1. Summary</h3></div></div></div><p>
	Due to asynchronous nature of AMQP 0-8/0-9/0-9-1 protocols sending a message with a routing key for which no queue binding exist results
	in either message being bounced back (if it is mandatory or immediate) or discarded on broker side otherwise.
	</p><p>
	When a 'mandatory' message is returned, the Apache Qpid JMS AMQP 0-x clients conveys this by delivering
	an <span class="emphasis"><em>AMQNoRouteException</em></span> through the configured ExceptionListener on the Connection.
	This does not cause channel or connection closure, however it requires a special exception handling
	on client side in order to deal with <span class="emphasis"><em>AMQNoRouteExceptions</em></span>.
	This could potentially be a problem when using various messaging frameworks (e.g. Mule)
	as they usually close the connection on receiving any JMSException.
	</p><p>
	In order to simplify application handling of scenarios where 'mandatory' messages
	are being sent to queues which do not actually exist, the Apache Qpid Broker-J can be configured such that
	it will respond to this situation by closing the connection
	rather than returning the unroutable message to the client as it normally should.
	From the application perspective, this will result in failure of synchronous operations in progress such as a session commit() call.
	</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>This feature affects only transacted sessions.</p><p>
	By default, the Apache Qpid JMS AMQP 0-x produces mandatory messages when using queue destinations. Topic
	destinations produce 'non-mandatory' messages.
	</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Close-Connection-When-No-Route-Configuration"></a>9.5.2. Configuring
	<span class="emphasis"><em>closeWhenNoRoute</em></span>
	</h3></div></div></div><p>
	The Port attribute <span class="emphasis"><em>closeWhenNoRoute</em></span> can be set to specify this feature on broker side.
	By default, it is turned on. Setting <span class="emphasis"><em>closeWhenNoRoute</em></span> to <span class="emphasis"><em>false</em></span> switches
	it off.
	</p><p>See the <a class="link" href="../../jms-client-0-8/book/JMS-Client-0-8-Connection-URL.html" target="_top">Qpid JMS AMQP 0-x client
	documentation</a> for details of enabling this feature client side.
	</p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Handling-Undeliverable-Messages.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Runtime.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Runtime-Flow-To-Disk.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.4. Handing Undeliverable Messages </td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 9.6. Flow to Disk</td></tr></table></div></div>

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