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From conflue...@apache.org
Subject [CONF] Apache Qpid: Qpid Java FAQ (page edited)
Date Thu, 31 Jul 2008 14:26:02 GMT
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<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/qpid">qpid</a> :
            <a href="http://cwiki.apache.org/confluence/display/qpid/Qpid+Java+FAQ">Qpid Java FAQ</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/qpid/Qpid+Java+FAQ">Qpid Java FAQ</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~mmccorma">Marnie McCormack</a>
            <span class="smallfont">(Jul 31, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=28400&originalVersion=26&revisedVersion=27">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content">

<h2><a name="QpidJavaFAQ-WhatisQpid%3F"></a><span id='tgl_content_q1' class='cloakToggle'></span> What is Qpid ?</h2>
<span id='content_q1' class='cloak' style='display: none'>

<p>The java implementation of Qpid is a pure Java message broker that implements the AMQP protocol. Essentially, Qpid is a robust, performant middleware component that can handle your messaging traffic.</p>

<p>It currently supports the following features:</p>

<ul>
	<li>High performance header-based routing for messages</li>
	<li>All features required by the JMS 1.1 specification. Qpid passes all tests in the Sun JMS compliance test suite</li>
	<li>Transaction support</li>
	<li>Persistence using the high performance Berkeley DB Java Edition. The persistence layer is also pluggable should an alternative implementation be required. The BDB store is available from the <a href="/confluence/display/qpid/3rd+Party+Libraries" title="3rd Party Libraries">3rd Party Libraries</a> page</li>
	<li>Pluggable security using SASL. Any Java SASL provider can be used</li>
	<li>Management using JMX and a custom management console built using Eclipse RCP</li>
	<li>Naturally, interoperability with other clients including the Qpid .NET, Python, Ruby and C++ implementations
</span></li>
</ul>


<h2><a name="QpidJavaFAQ-CanyouhelpmegetstartedwithQpid%3F"></a><span id='tgl_content_q2' class='cloakToggle'></span> Can you help me get started with Qpid?</h2>
<span id='content_q2' class='cloak' style='display: none'>
<p>Have a look at our <a href="/confluence/display/qpid/Getting+Started+Guide" title="Getting Started Guide">Getting Started Guide</a></p>
</span>

<h2><a name="QpidJavaFAQ-HowdoIinstalltheQpidbroker%3F"></a><span id='tgl_content_q3' class='cloakToggle'></span> How do I install the Qpid broker ?</h2>
<span id='content_q3' class='cloak' style='display: none'>
<p>Please follow the instructions provided on our <a href="/confluence/display/qpid/Getting+Started+Guide" title="Getting Started Guide">Getting Started Guide</a>.</p>
</span>

<h2><a name="QpidJavaFAQ-HowdoIruntheQpidbroker%3F"></a><span id='tgl_content_q4' class='cloakToggle'></span> How do I run the Qpid broker ?</h2>
<span id='content_q4' class='cloak' style='display: none'>
<p>The broker comes with a script for unix/linux/cygwin called qpid-server, which can be found in the bin directory of the installed package. This command can be executed without any paramters and will then use the default configuration file provided on install.</p>

<p>For the Windows OS, please use qpid-server.bat.</p>

<p>There's no need to set your classpath for QPID as the scripts take care of that by adding jar's with classpath defining manifest files to your classpath.</p>

<p>For more information on running the broker please see our <a href="/confluence/display/qpid/Getting+Started" title="Getting Started">Getting Started</a> page.</p>
</span>

<h2><a name="QpidJavaFAQ-HowcanIcreateaconnectionusingaURL%3F"></a><span id='tgl_content_q5' class='cloakToggle'></span> How can I create a connection using a URL ?</h2>
<span id='content_q5' class='cloak' style='display: none'>
<p>The format for connection URL in QPID is as follows:</p>
<div class="preformatted"><div class="preformattedContent">
<pre>amqp://[user:pass@][clientid]/virtualhost?brokerlist='[transport://]host[:port][?option='value'[&amp;option='value']];'
                                         [&amp;failover='method[?option='value'[&amp;option='value']]']
                                         [&amp;option='value']"
</pre>
</div></div>
<p>Don't be alarmed - it's really not that complex &#33;</p>

<p>You could use a URL which looks something like this:</p>

<p><tt>amqp://guest:guest@client1/development?brokerlist='tcp://localhost:5672'</tt></p>

<p>Breaking this example down, here's what it all means:</p>

<p>amqp = the protocol we're using</p>

<p>guest:guest@localhost = username:password@clientid where the clientid is the name of your server (used under the covers but don't worry about this for now). Always use the guest:guest combination at the moment.</p>

<p>development = the name of the virtualhost, where the virtualhost is a path which acts as a namespace. You can effectively use any value here so long as you're consistent throughout. The virtualhost must start with a slash "/" and continue with names separated by slashes. A name consists of any combination of at least one of [A-Za-z0-9] plus zero or more of [.-_+&#33;=:].</p>

<p>brokerlist = this is the host address and port for the broker you want to connect to. The connection factory will assume tcp if you don't specify a transport protocol. The port also defaults to 5672. Naturally you have to put at least one broker in this list.</p>

<p>This example is not using failover so only provides one host for the broker. If you do wish to connect using failover you can provide two (or more) brokers in the format:</p>

<p>brokerlist='tcp://host1;tcp://host2:5673'</p>

<p>The default failover setup will automatically retry each broker once after a failed connection. If the brokerlist contains more than one server then these servers are tried in a round robin. Details on how to modifiy this behaviour will follow soon &#33;</p>
</span>
<h2><a name="QpidJavaFAQ-HowdoIrepresentaJMSDestinationstringwithQPID%3F"></a><span id='tgl_content_q6' class='cloakToggle'></span> How do I represent a JMS Destination string with QPID ?</h2>
<span id='content_q6' class='cloak' style='display: none'>
<h4><a name="QpidJavaFAQ-Queues"></a>Queues</h4>

<p>A queue can be created in QPID using the following URL format.</p>

<p><tt>direct://amq.direct//&lt;Queue Name&gt;</tt></p>

<p>For example: <tt>direct://amq.direct//simpleQueue</tt></p>

<p>Queue names may consist of any mixture of digits, letters, and underscores.</p>

<h4><a name="QpidJavaFAQ-Topics"></a>Topics</h4>

<p>A topic can be created in QPID using the following URL format.</p>

<p><tt>topic://amq.topic/&lt;Topic Subscription&gt;/</tt></p>

<p>The topic subscription may only contain the letters A-Z and a-z and digits 0-9.</p>

<p>cloak.memory.duration = 0</p>

<span id='content_q6_hiddentillqpid-3isdone' class='cloak' style='display: none'>
<p>The topic subscription is formed from a series of words that may only contain the letters A-Z and a-z and digits 0-9.<br/>
The words are delimited by dots. Each dot represents a new level.</p>

<p>For example: <tt>stocks.nyse.ibm</tt></p>

<p>Wildcards can be used on subscription with the following meaning.</p>
<ul>
	<li>match a single level<br/>
<tt>#</tt> match zero or more levels</li>
</ul>


<p>For example:<br/>
With two clients<br/>
1 - <tt>stocks.*.ibm</tt><br/>
2 - <tt>stocks.#.ibm</tt></p>

<p>Publishing <tt>stocks.nyse.ibm</tt> will be received by both clients but <tt>stocks.ibm</tt> and <tt>stocks.world.us.ibm</tt> will only be received by client 2.</p>

<p>The topic currently does not support wild cards.</p>
</span>
</span>
<h2><a name="QpidJavaFAQ-HowdoIconnecttothebrokerusingJNDI%3F"></a><span id='tgl_content_q7' class='cloakToggle'></span> How do I connect to the broker using JNDI ?</h2>
<span id='content_q7' class='cloak' style='display: none'>
<p>see <a href="/confluence/display/qpid/How+to+Use+JNDI" title="How to Use JNDI">How to use JNDI</a></p>

</span>
<h2><a name="QpidJavaFAQ-I%27musingSpringandWeblogiccanyouhelpmewiththeconfigurationformovingovertoQpid%3F"></a><span id='tgl_content_q8' class='cloakToggle'></span> I'm using Spring and Weblogic - can you help me with the configuration for moving over to Qpid ?</h2>
<span id='content_q8' class='cloak' style='display: none'>
<p>Here is a donated Spring configuration file <span class="nobr"><a href="/confluence/download/attachments/28400/appContext.zip?version=1" title="appContext.zip attached to Qpid Java FAQ">appContext.zip<sup><img class="rendericon" src="/confluence/images/icons/link_attachment_7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> which shows the config for Qpid side by side with Weblogic. HtH &#33;</p>
</span>
<h2><a name="QpidJavaFAQ-HowdoIconfigurethelogginglevelforQpid%3F"></a><span id='tgl_content_q9' class='cloakToggle'></span> How do I configure the logging level for Qpid ?</h2>
<span id='content_q9' class='cloak' style='display: none'>
<p>The system property <div class="preformatted"><div class="preformattedContent">
<pre>amqj.logging.level</pre>
</div></div> can be used to configure the logging level. </p>

<p>For the broker, you can use the environment variable AMQJ_LOGGING_LEVEL which is picked up by the qpid-run script (called by qpid-server to start the broker) at runtime.</p>

<p>For client code that you've written, simply pass in a system property to your command line to set it to the level you'd like i.e. </p>
<div class="preformatted"><div class="preformattedContent">
<pre>-Damqj.logging.level=INFO
</pre>
</div></div>

<p>The log level for the broker defaults to INFO if the env variable is not set, but you may find that your log4j properties affect this. Setting the property noted above should address this.</p>
</span>
<h2><a name="QpidJavaFAQ-HowcanIconfigurethebroker%3F"></a><span id='tgl_content_q10' class='cloakToggle'></span> How can I configure the broker ?</h2>
<span id='content_q10' class='cloak' style='display: none'>
<p>The broker configuration is contained in the &lt;installed-dir&gt;/etc/config.xml file. You can copy and edit this file and then specify your own configuration file as a parameter to the startup script using the &#45;c flag i.e. qpid-server &#45;c &lt;your_config_file's_path&gt;</p>

<p>For more detailed information on configuration, please see <a href="/confluence/display/qpid/Qpid+Design+-+Configuration" title="Qpid Design - Configuration">Qpid Design &#45; Configuration</a></p>
</span>
<h2><a name="QpidJavaFAQ-HowcanIchangetheportthebrokerusesatruntime%3F"></a><span id='tgl_content_q11' class='cloakToggle'></span> How can I change the port the broker uses at runtime ?</h2>
<span id='content_q11' class='cloak' style='display: none'>
<p>The broker defaults to use port 5672 at startup.</p>

<p>To change this, use the &#45;p flag at startup i.e. qpid-server &#45;p &lt;port_number_to_use&gt;</p>

<p>Use this to get round any issues on your host server with port 5672 being in use/unavailable.</p>

<p>For more detailed information on configuration, please see <a href="/confluence/display/qpid/Qpid+Design+-+Configuration" title="Qpid Design - Configuration">Qpid Design &#45; Configuration</a></p>
</span>
<h2><a name="QpidJavaFAQ-WhatcommandlineoptionscanIpassintotheqpidserverscript%3F"></a><span id='tgl_content_q12' class='cloakToggle'></span> What command line options can I pass into the qpid-server script ?</h2>
<span id='content_q12' class='cloak' style='display: none'>
<p>The following options are available:</p>
<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'> Option </th>
<th class='confluenceTh'> Long Option </th>
<th class='confluenceTh'> Description </th>
</tr>
<tr>
<td class='confluenceTd'> b </td>
<td class='confluenceTd'> bind </td>
<td class='confluenceTd'> Bind to the specified address overriding any value in the config file </td>
</tr>
<tr>
<td class='confluenceTd'> c </td>
<td class='confluenceTd'> config </td>
<td class='confluenceTd'> Use the given configuration file </td>
</tr>
<tr>
<td class='confluenceTd'> h </td>
<td class='confluenceTd'> help </td>
<td class='confluenceTd'> Prints list of options </td>
</tr>
<tr>
<td class='confluenceTd'> l </td>
<td class='confluenceTd'> logconfig </td>
<td class='confluenceTd'> Use the specified log4j.xml file rather than that in the etc directory </td>
</tr>
<tr>
<td class='confluenceTd'> p </td>
<td class='confluenceTd'> port </td>
<td class='confluenceTd'> Specify port to listen on. Overrides value in config file </td>
</tr>
<tr>
<td class='confluenceTd'> v </td>
<td class='confluenceTd'> version </td>
<td class='confluenceTd'> Print version information and exit </td>
</tr>
<tr>
<td class='confluenceTd'> w </td>
<td class='confluenceTd'> logwatch </td>
<td class='confluenceTd'> Specify interval for checking for logging config changes. Zero means no checking </td>
</tr>
</tbody></table>

<p>For more detailed information on configuration, please see <a href="/confluence/display/qpid/Qpid+Design+-+Configuration" title="Qpid Design - Configuration">Qpid Design &#45; Configuration</a></p>
</span>
<h2><a name="QpidJavaFAQ-HowdoIauthenticatewiththebroker%3FWhatuserid%26passwordshouldIuse%3F"></a><span id='tgl_content_q13' class='cloakToggle'></span> How do I authenticate with the broker ? What user id &amp; password should I use ?</h2>
<span id='content_q13' class='cloak' style='display: none'>
<p>You should login as user guest with password guest</p>
</span>
<h2><a name="QpidJavaFAQ-HowdoIcreatequeuesthatwillalwaysbeinstantiatedatbrokerstartup%3F"></a><span id='tgl_content_q14' class='cloakToggle'></span> How do I create queues that will always be instantiated at broker startup ?</h2>
<span id='content_q14' class='cloak' style='display: none'>
<p>You can configure queues which will be created at broker startup by tailoring a copy of the virtualhosts.xml file provided in the installed qpid-version/etc directory.</p>

<p>So, if you're using a queue called 'devqueue' you can ensure that it is created at startup by using an entry something like this:</p>

<div class="preformatted"><div class="preformattedContent">
<pre>&lt;virtualhosts&gt;
  &lt;default&gt;test&lt;/default&gt;
  &lt;virtualhost&gt;
   &lt;name&gt;test&lt;/name&gt;
   &lt;test&gt;  
   &lt;queue&gt;
      &lt;name&gt;devqueue&lt;/name&gt;
      &lt;devqueue&gt;
        &lt;exchange&gt;amq.direct&lt;/exchange&gt;
        &lt;maximumQueueDepth&gt;4235264&lt;/maximumQueueDepth&gt;  &lt;!-- 4Mb --&gt;
        &lt;maximumMessageSize&gt;2117632&lt;/maximumMessageSize&gt; &lt;!-- 2Mb --&gt;
        &lt;maximumMessageAge&gt;600000&lt;/maximumMessageAge&gt;  &lt;!-- 10 mins --&gt;
      &lt;/devqueue&gt;
   &lt;/queue&gt;
   &lt;/test&gt;
  &lt;/virtualhost&gt;
&lt;/virtualhosts&gt;
</pre>
</div></div>

<p>Note that the name (in thie example above the name is 'test') element should match the virtualhost that you're using to create connections to the broker. This is effectively a namespace used to prevent queue name clashes etc. You can also see that we've set the 'test' virtual host to be the default for any connections which do not specify a virtual host (in the &lt;default&gt; tag).</p>

<p>You can amend the config.xml to point at a different virtualhosts.xml file by editing the &lt;virtualhosts/&gt; element.</p>

<p>So, for example, you could tell the broker to use a file in your home directory by creating a new config.xml file with the following entry:</p>

<p>&lt;virtualhosts&gt;/home/myhomedir/virtualhosts.xml&lt;/virtualhosts&gt;</p>

<p>You can then pass this amended config.xml into the broker at startup using the &#45;c flag i.e.<br/>
qpid-server &#45;c &lt;path&gt;/config.xml</p>
</span>

<h2><a name="QpidJavaFAQ-Wheredoundeliverablemessagesendup%3F"></a><span id='tgl_content_q16' class='cloakToggle'></span> Where do undeliverable messages end up ?</h2>
<span id='content_q16' class='cloak' style='display: none'>
<p>At present, messages with an invalid routing key will be returned to the sender. If you register an exception listener for your publisher (easiest to do by making your publisher implement the ExceptionListener interface and coding the onException method) you'll see that you end up in onException in this case. You can expect to be catching a subclass of org.apache.qpid.AMQUndeliveredException.</p>
</span>

<h2><a name="QpidJavaFAQ-CanIconfigurethenameoftheQpidbrokerlogfileatruntime%3F"></a><span id='tgl_content_q17' class='cloakToggle'></span> Can I configure the name of the Qpid broker log file at runtime ?</h2>
<span id='content_q17' class='cloak' style='display: none'>
<p>If you simply start the Qpid broker using the default configuration, then the log file is written to $QPID_WORK/log/qpid.log</p>

<p>This is not ideal if you want to run several instances from one install, or acrhive logs to a shared drive from several hosts.</p>

<p>To make life easier, there are two optional ways to configure the naming convention used for the broker log.</p>

<h3><a name="QpidJavaFAQ-Settingaprefixorsuffix"></a>Setting a prefix or suffix</h3>

<p>Users should set the following environment variables before running qpid-server:</p>

<p>QPID_LOG_PREFIX - will prefix the log file name with the specified value e.g. if you set this value to be the name of your host (for example) it could look something like host123qpid.log</p>

<p>QPID_LOG_SUFFIX - will suffix the file name with the specified value e.g. if you set this value to be the name of your application (for example) if could look something like qpidMyApp.log</p>

<h3><a name="QpidJavaFAQ-IncludingthePID"></a>Including the PID</h3>

<p>Setting either of these variables to the special value PID will introduce the process id of the java process into the file name as a prefix or suffix as specified**</p>
</span>

<h2><a name="QpidJavaFAQ-Myclientapplicationappearstohavehung%3F"></a><span id='tgl_content_q14b' class='cloakToggle'></span> My client application appears to have hung?</h2>
<span id='content_q14b' class='cloak' style='display: none'>
<p>The client code currently has various timeouts scattered throughout the code. These can cause your client to appear like it has hung when it is actually waiting for the timeout ot compelete. One example is when the broker becomes non-responsive, the client code has a hard coded 2 minute timeout that it will wait when closing a connection. These timeouts need to be consolidated and exposed. see <span class="nobr"><a href="https://issues.apache.org/jira/browse/QPID-429" title="Visit page outside Confluence" rel="nofollow">QPID-429<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span></p>
</span>

<h2><a name="QpidJavaFAQ-HowdoIcontacttheQpidteam%3F"></a><span id='tgl_content_q15' class='cloakToggle'></span> How do I contact the Qpid team ?</h2>
<span id='content_q15' class='cloak' style='display: none'>
<p>For now, subscribe to our developer list (email qpid-dev-subscribe@incubator.apache.com). A users list is currently being set up!</p>
</span>

<h2><a name="QpidJavaFAQ-HowcanIchangeauser%27spasswordwhilethebrokerisup%3F"></a><span id='tgl_content_q18' class='cloakToggle'></span> How can I change a user's password while the broker is up ?</h2>
<span id='content_q18' class='cloak' style='display: none'>
<p>You can do this via the management console <b>if</b> you're using the base64password file (rather than plain text). To do this simply log in to the management console as an admin user (you need to have created an admin account in the jmxremote.access file first) and then select the 'Manage Users' pane. There is a 'Change Password' tab which you can then use. Alternatively, update the password file and use the management console to reload the file, in the 'Manage Users' pane. In both cases, this will take effect when the user next logs in i.e. will not cause them to be disconnected if they are already connected.  </p>
</span></div>


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