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From clebertsuco...@apache.org
Subject svn commit: r1018163 [8/45] - in /websites/production/activemq/content/artemis/docs: 2.2.0/ latest/ latest/diagrams/ latest/gitbook/ latest/gitbook/fonts/ latest/gitbook/fonts/fontawesome/ latest/gitbook/gitbook-plugin-fontsettings/ latest/gitbook/gitb...
Date Thu, 14 Sep 2017 19:48:13 GMT
Added: websites/production/activemq/content/artemis/docs/latest/configuring-transports.html
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--- websites/production/activemq/content/artemis/docs/latest/configuring-transports.html (added)
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+        <title>Configuring Transports · ActiveMQ Artemis Documentation</title>
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+            
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+        <li class="chapter " data-level="1.15" data-path="wildcard-routing.html">
+            
+                <a href="wildcard-routing.html">
+            
+                    
+                    Routing Messages With Wild Cards
+            
+                </a>
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+    
+        <li class="chapter " data-level="1.16" data-path="wildcard-syntax.html">
+            
+                <a href="wildcard-syntax.html">
+            
+                    
+                    Understanding the Apache ActiveMQ Artemis Wildcard Syntax
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.17" data-path="filter-expressions.html">
+            
+                <a href="filter-expressions.html">
+            
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+                    Filter Expressions
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+        <li class="chapter " data-level="1.18" data-path="persistence.html">
+            
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+                    Persistence
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+    
+        <li class="chapter active" data-level="1.19" data-path="configuring-transports.html">
+            
+                <a href="configuring-transports.html">
+            
+                    
+                    Configuring Transports
+            
+                </a>
+            
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+        </li>
+    
+        <li class="chapter " data-level="1.20" data-path="config-reload.html">
+            
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+            
+                    
+                    Configuration Reload
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+                </a>
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+    
+        <li class="chapter " data-level="1.21" data-path="connection-ttl.html">
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+                <a href="connection-ttl.html">
+            
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+                    Detecting Dead Connections
+            
+                </a>
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+        <li class="chapter " data-level="1.22" data-path="slow-consumers.html">
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+            
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+                    Detecting Slow Consumers
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+        <li class="chapter " data-level="1.23" data-path="network-isolation.html">
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+                    Avoiding Network Isolation
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+                </a>
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+    
+        <li class="chapter " data-level="1.24" data-path="critical-analysis.html">
+            
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+            
+                    
+                    Detecting Broker Issues (Critical Analysis)
+            
+                </a>
+            
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+        </li>
+    
+        <li class="chapter " data-level="1.25" data-path="transaction-config.html">
+            
+                <a href="transaction-config.html">
+            
+                    
+                    Resource Manager Configuration
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.26" data-path="flow-control.html">
+            
+                <a href="flow-control.html">
+            
+                    
+                    Flow Control
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.27" data-path="send-guarantees.html">
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+            
+                    
+                    Guarantees of sends and commits
+            
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+    
+        <li class="chapter " data-level="1.28" data-path="undelivered-messages.html">
+            
+                <a href="undelivered-messages.html">
+            
+                    
+                    Message Redelivery and Undelivered Messages
+            
+                </a>
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+    
+        <li class="chapter " data-level="1.29" data-path="message-expiry.html">
+            
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+            
+                    
+                    Message Expiry
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+        <li class="chapter " data-level="1.30" data-path="large-messages.html">
+            
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+            
+                    
+                    Large Messages
+            
+                </a>
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+    
+        <li class="chapter " data-level="1.31" data-path="paging.html">
+            
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+                    Paging
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+    
+        <li class="chapter " data-level="1.32" data-path="queue-attributes.html">
+            
+                <a href="queue-attributes.html">
+            
+                    
+                    Queue Attributes
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.33" data-path="scheduled-messages.html">
+            
+                <a href="scheduled-messages.html">
+            
+                    
+                    Scheduled Messages
+            
+                </a>
+            
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+        </li>
+    
+        <li class="chapter " data-level="1.34" data-path="last-value-queues.html">
+            
+                <a href="last-value-queues.html">
+            
+                    
+                    Last-Value Queues
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.35" data-path="message-grouping.html">
+            
+                <a href="message-grouping.html">
+            
+                    
+                    Message Grouping
+            
+                </a>
+            
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+    
+        <li class="chapter " data-level="1.36" data-path="pre-acknowledge.html">
+            
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+            
+                    
+                    Extra Acknowledge Modes
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+                </a>
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+    
+        <li class="chapter " data-level="1.37" data-path="management.html">
+            
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+            
+                    
+                    Management
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+        <li class="chapter " data-level="1.38" data-path="management-console.html">
+            
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+            
+                    
+                    Management Console
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+        <li class="chapter " data-level="1.39" data-path="security.html">
+            
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+                    Security
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+        <li class="chapter " data-level="1.40" data-path="broker-plugins.html">
+            
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+            
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+                    Broker Plugins
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+    
+        <li class="chapter " data-level="1.41" data-path="resource-limits.html">
+            
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+            
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+                    Resource Limits
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+    
+        <li class="chapter " data-level="1.42" data-path="jms-bridge.html">
+            
+                <a href="jms-bridge.html">
+            
+                    
+                    The JMS Bridge
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.43" data-path="client-reconnection.html">
+            
+                <a href="client-reconnection.html">
+            
+                    
+                    Client Reconnection and Session Reattachment
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.44" data-path="diverts.html">
+            
+                <a href="diverts.html">
+            
+                    
+                    Diverting and Splitting Message Flows
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.45" data-path="core-bridges.html">
+            
+                <a href="core-bridges.html">
+            
+                    
+                    Core Bridges
+            
+                </a>
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+    
+        <li class="chapter " data-level="1.46" data-path="duplicate-detection.html">
+            
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+            
+                    
+                    Duplicate Message Detection
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+                </a>
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+
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+        </li>
+    
+        <li class="chapter " data-level="1.47" data-path="clusters.html">
+            
+                <a href="clusters.html">
+            
+                    
+                    Clusters
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.48" data-path="ha.html">
+            
+                <a href="ha.html">
+            
+                    
+                    High Availability and Failover
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.49" data-path="graceful-shutdown.html">
+            
+                <a href="graceful-shutdown.html">
+            
+                    
+                    Graceful Server Shutdown
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.50" data-path="libaio.html">
+            
+                <a href="libaio.html">
+            
+                    
+                    Libaio Native Libraries
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.51" data-path="thread-pooling.html">
+            
+                <a href="thread-pooling.html">
+            
+                    
+                    Thread management
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.52" data-path="logging.html">
+            
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+            
+                    
+                    Logging
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.53" data-path="rest.html">
+            
+                <a href="rest.html">
+            
+                    
+                    REST Interface
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.54" data-path="embedding-activemq.html">
+            
+                <a href="embedding-activemq.html">
+            
+                    
+                    Embedding Apache ActiveMQ Artemis
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.55" data-path="karaf.html">
+            
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+            
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+                    Apache Karaf
+            
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+            
+
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+    
+        <li class="chapter " data-level="1.56" data-path="spring-integration.html">
+            
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+            
+                    
+                    Spring Integration
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+    
+        <li class="chapter " data-level="1.57" data-path="cdi-integration.html">
+            
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+            
+                    
+                    CDI Integration
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+                </a>
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+    
+        <li class="chapter " data-level="1.58" data-path="intercepting-operations.html">
+            
+                <a href="intercepting-operations.html">
+            
+                    
+                    Intercepting Operations
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.59" data-path="protocols-interoperability.html">
+            
+                <a href="protocols-interoperability.html">
+            
+                    
+                    Protocols and Interoperability
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.60" data-path="tools.html">
+            
+                <a href="tools.html">
+            
+                    
+                    Tools
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.61" data-path="maven-plugin.html">
+            
+                <a href="maven-plugin.html">
+            
+                    
+                    Maven Plugin
+            
+                </a>
+            
+
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+        </li>
+    
+        <li class="chapter " data-level="1.62" data-path="unit-testing.html">
+            
+                <a href="unit-testing.html">
+            
+                    
+                    Unit Testing
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.63" data-path="perf-tuning.html">
+            
+                <a href="perf-tuning.html">
+            
+                    
+                    Troubleshooting and Performance Tuning
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.64" data-path="configuration-index.html">
+            
+                <a href="configuration-index.html">
+            
+                    
+                    Configuration Reference
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.65" data-path="updating-artemis.html">
+            
+                <a href="updating-artemis.html">
+            
+                    
+                    Updating Artemis
+            
+                </a>
+            
+
+            
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+    
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+
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+
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+        <a href="https://www.gitbook.com" target="blank" class="gitbook-link">
+            Published with GitBook
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+    <!-- Title -->
+    <h1>
+        <i class="fa fa-circle-o-notch fa-spin"></i>
+        <a href="." >Configuring Transports</a>
+    </h1>
+</div>
+
+
+
+
+                    <div class="page-wrapper" tabindex="-1" role="main">
+                        <div class="page-inner">
+                            
+<div id="book-search-results">
+    <div class="search-noresults">
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+                                <section class="normal markdown-section">
+                                
+                                <h1 id="configuring-the-transport">Configuring the Transport</h1>
+<p>In this chapter we&apos;ll describe the concepts required for understanding
+Apache ActiveMQ Artemis transports and where and how they&apos;re configured.</p>
+<h2 id="understanding-acceptors">Understanding Acceptors</h2>
+<p>One of the most important concepts in Apache ActiveMQ Artemis transports is the
+<em>acceptor</em>. Let&apos;s dive straight in and take a look at an acceptor
+defined in xml in the configuration file <code>broker.xml</code>.</p>
+<pre><code>&lt;acceptors&gt;
+   &lt;acceptor name=&quot;netty&quot;&gt;tcp://localhost:61617&lt;/acceptor&gt;
+&lt;/acceptors&gt;
+</code></pre><p>Acceptors are always defined inside an <code>acceptors</code> element. There can be
+one or more acceptors defined in the <code>acceptors</code> element. There&apos;s no
+upper limit to the number of acceptors per server.</p>
+<p>Each acceptor defines a way in which connections can be made to the
+Apache ActiveMQ Artemis server.</p>
+<p>In the above example we&apos;re defining an acceptor that uses
+<a href="http://netty.io/" target="_blank">Netty</a> to listen for connections at port
+<code>61617</code>.</p>
+<p>The <code>acceptor</code> element contains a <code>URL</code> that defines the kind of Acceptor
+to create along with its configuration. The <code>schema</code> part of the <code>URL</code>
+defines the Acceptor type which can either be <code>tcp</code> or <code>vm</code> which is
+<code>Netty</code> or an In VM Acceptor respectively. For <code>Netty</code> the host and the
+port of the <code>URL</code> define what host and port the <code>acceptor</code> will bind to. For
+In VM the <code>Authority</code> part of the <code>URL</code> defines a unique server id.</p>
+<p>The <code>acceptor</code> can also be configured with a set of key=value pairs
+used to configure the specific transport, the set of
+valid key=value pairs depends on the specific transport be used and are
+passed straight through to the underlying transport. These are set on the
+<code>URL</code> as part of the query, like so:</p>
+<pre><code>&lt;acceptor name=&quot;netty&quot;&gt;tcp://localhost:61617?sslEnabled=true&amp;keyStorePath=/path&lt;/acceptor&gt;
+</code></pre><h2 id="understanding-connectors">Understanding Connectors</h2>
+<p>Whereas acceptors are used on the server to define how we accept
+connections, connectors are used to define how to connect to a server.</p>
+<p>Let&apos;s look at a connector defined in our <code>broker.xml</code> file:</p>
+<pre><code>&lt;connectors&gt;
+   &lt;connector name=&quot;netty&quot;&gt;tcp://localhost:61617&lt;/connector&gt;
+&lt;/connectors&gt;
+</code></pre><p>Connectors can be defined inside a <code>connectors</code> element. There can be
+one or more connectors defined in the <code>connectors</code> element. There&apos;s no
+upper limit to the number of connectors per server.</p>
+<p>A <code>connector</code> is used when the server acts as a client itself, e.g.:</p>
+<ul>
+<li>When one server is bridged to another</li>
+<li>When a server takes part in a cluster</li>
+</ul>
+<p>In these cases the server needs to know how to connect to other servers.
+That&apos;s defined by <code>connectors</code>.</p>
+<h2 id="configuring-the-transport-directly-from-the-client-side">Configuring the transport directly from the client side.</h2>
+<p>How do we configure a core <code>ClientSessionFactory</code> with the information
+that it needs to connect with a server?</p>
+<p>Connectors are also used indirectly when configuring a core
+<code>ClientSessionFactory</code> to directly talk to a server. Although in this
+case there&apos;s no need to define such a connector in the server side
+configuration, instead we just specify the appropriate URI.</p>
+<p>Here&apos;s an example of creating a <code>ClientSessionFactory</code> which will
+connect directly to the acceptor we defined earlier in this chapter, it
+uses the standard Netty TCP transport and will try and connect on port
+61617 to localhost (default):</p>
+<pre><code class="lang-java">ServerLocator locator = ActiveMQClient.createServerLocator(<span class="hljs-string">&quot;tcp://localhost:61617&quot;</span>);
+
+ClientSessionFactory sessionFactory = locator.createClientSessionFactory();
+
+ClientSession session = sessionFactory.createSession(...);
+</code></pre>
+<p>Similarly, if you&apos;re using JMS, you can configure the JMS connection
+factory directly on the client side:</p>
+<pre><code class="lang-java">ConnectionFactory connectionFactory = <span class="hljs-keyword">new</span> ActiveMQConnectionFactory(<span class="hljs-string">&quot;tcp://localhost:61617&quot;</span>);
+
+Connection jmsConnection = connectionFactory.createConnection();
+</code></pre>
+<h2 id="configuring-the-netty-transport">Configuring the Netty transport</h2>
+<p>Out of the box, Apache ActiveMQ Artemis currently uses
+<a href="http://netty.io/" target="_blank">Netty</a>, a high performance low level
+network library.</p>
+<p>Our Netty transport can be configured in several different ways; to use
+straightforward TCP sockets, SSL, or to tunnel over HTTP or HTTPS..</p>
+<p>We believe this caters for the vast majority of transport requirements.</p>
+<h2 id="single-port-support">Single Port Support</h2>
+<p>Apache ActiveMQ Artemis supports using a single port for all
+protocols, Apache ActiveMQ Artemis will automatically detect which protocol is being
+used CORE, AMQP, STOMP or OPENWIRE and use the appropriate Apache ActiveMQ Artemis
+handler. It will also detect whether protocols such as HTTP or Web
+Sockets are being used and also use the appropriate decoders</p>
+<p>It is possible to limit which protocols are supported by using the
+<code>protocols</code> parameter on the Acceptor like so:</p>
+<pre><code>    &lt;connector name=&quot;netty&quot;&gt;tcp://localhost:61617?protocols=CORE,AMQP&lt;/connector&gt;
+</code></pre><h2 id="configuring-netty-tcp">Configuring Netty TCP</h2>
+<p>Netty TCP is a simple unencrypted TCP sockets based transport. If you&apos;re
+running connections across an untrusted network please bear in
+mind this transport is unencrypted. You may want to look at the SSL or
+HTTPS configurations.</p>
+<p>With the Netty TCP transport all connections are initiated from the
+client side (i.e. the server does not initiate any connections to the
+client). This works well with firewall policies that typically only allow
+connections to be initiated in one direction.</p>
+<p>All the valid keys for the <code>tcp</code> URL scheme used for Netty are defined in the
+class <code>org.apache.activemq.artemis.core.remoting.impl.netty.TransportConstants</code>.
+Most parameters can be used either with acceptors or connectors, some only
+work with acceptors. The following parameters can be used to configure
+Netty for simple TCP:</p>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>The <code>host</code> and <code>port</code> parameters are only used in the core API, in
+XML configuration these are set in the URI host and port.</p>
+</blockquote>
+<ul>
+<li><p><code>host</code>. This specifies the host name or IP address to connect to
+(when configuring a connector) or to listen on (when configuring an
+acceptor). The default value for this property is <code>localhost</code>. When
+configuring acceptors, multiple hosts or IP addresses can be
+specified by separating them with commas. It is also possible to
+specify <code>0.0.0.0</code> to accept connection from all the host&apos;s network
+interfaces. It&apos;s not valid to specify multiple addresses when
+specifying the host for a connector; a connector makes a connection
+to one specific address.</p>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>Don&apos;t forget to specify a host name or IP address! If you want
+your server able to accept connections from other nodes you must
+specify a hostname or IP address at which the acceptor will bind
+and listen for incoming connections. The default is localhost
+which of course is not accessible from remote nodes!</p>
+</blockquote>
+</li>
+<li><p><code>port</code>. This specified the port to connect to (when configuring a
+connector) or to listen on (when configuring an acceptor). The
+default value for this property is <code>61616</code>.</p>
+</li>
+<li><p><code>tcpNoDelay</code>. If this is <code>true</code> then <a href="http://en.wikipedia.org/wiki/Nagle%27s_algorithm" target="_blank">Nagle&apos;s
+algorithm</a> will be
+disabled. This is a <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/net/socketOpt.html" target="_blank">Java (client) socket
+option</a>.
+The default value for this property is <code>true</code>.</p>
+</li>
+<li><p><code>tcpSendBufferSize</code>. This parameter determines the size of the
+TCP send buffer in bytes. The default value for this property is
+<code>32768</code> bytes (32KiB).</p>
+<p>TCP buffer sizes should be tuned according to the bandwidth and
+latency of your network. Here&apos;s a good link that explains the theory
+behind <a href="http://www-didc.lbl.gov/TCP-tuning/" target="_blank">this</a>.</p>
+<p>In summary TCP send/receive buffer sizes should be calculated as:</p>
+<pre><code>buffer_size = bandwidth * RTT.
+</code></pre><p>Where bandwidth is in <em>bytes per second</em> and network round trip time
+(RTT) is in seconds. RTT can be easily measured using the <code>ping</code>
+utility.</p>
+<p>For fast networks you may want to increase the buffer sizes from the
+defaults.</p>
+</li>
+<li><p><code>tcpReceiveBufferSize</code>. This parameter determines the size of the
+TCP receive buffer in bytes. The default value for this property is
+<code>32768</code> bytes (32KiB).</p>
+</li>
+<li><p><code>writeBufferLowWaterMark</code>. This parameter determines the low water mark of 
+the Netty write buffer. Once the number of bytes queued in the write buffer exceeded 
+the high water mark and then dropped down below this value, Netty&apos;s channel 
+will start to be writable again. The default value for this property is 
+<code>32768</code> bytes (32KiB).</p>
+</li>
+<li><p><code>writeBufferHighWaterMark</code>. This parameter determines the high water mark of 
+the Netty write buffer. If the number of bytes queued in the write buffer exceeds 
+this value, Netty&apos;s channel will start to be not writable. The default value for 
+this property is <code>131072</code> bytes (128KiB).</p>
+</li>
+<li><p><code>batchDelay</code>. Before writing packets to the transport, Apache ActiveMQ Artemis can
+be configured to batch up writes for a maximum of <code>batchDelay</code>
+milliseconds. This can increase overall throughput for very small
+messages. It does so at the expense of an increase in average
+latency for message transfer. The default value for this property is
+<code>0</code> ms.</p>
+</li>
+<li><p><code>directDeliver</code>. When a message arrives on the server and is
+delivered to waiting consumers, by default, the delivery is done on
+the same thread as that on which the message arrived. This gives
+good latency in environments with relatively small messages and a
+small number of consumers, but at the cost of overall throughput and
+scalability - especially on multi-core machines. If you want the
+lowest latency and a possible reduction in throughput then you can
+use the default value for <code>directDeliver</code> (i.e. <code>true</code>). If you are
+willing to take some small extra hit on latency but want the highest
+throughput set <code>directDeliver</code> to <code>false</code>.</p>
+</li>
+<li><p><code>nioRemotingThreads</code> This is deprecated. It is replaced by <code>remotingThreads</code>, 
+if you are using this please update your configuration</p>
+</li>
+<li><p><code>remotingThreads</code>. Apache ActiveMQ Artemis will,
+by default, use a number of threads equal to three times the number
+of cores (or hyper-threads) as reported by
+<code>Runtime.getRuntime().availableProcessors()</code> for processing incoming
+packets. If you want to override this value, you can set the number
+of threads by specifying this parameter. The default value for this
+parameter is <code>-1</code> which means use the value from
+<code>Runtime.getRuntime().availableProcessors()</code> * 3.</p>
+</li>
+<li><p><code>localAddress</code>. When configured a Netty Connector it is possible to
+specify which local address the client will use when connecting to
+the remote address. This is typically used in the Application Server
+or when running Embedded to control which address is used for
+outbound connections. If the local-address is not set then the
+connector will use any local address available</p>
+</li>
+<li><p><code>localPort</code>. When configured a Netty Connector it is possible to
+specify which local port the client will use when connecting to the
+remote address. This is typically used in the Application Server or
+when running Embedded to control which port is used for outbound
+connections. If the local-port default is used, which is 0, then the
+connector will let the system pick up an ephemeral port. valid ports
+are 0 to 65535</p>
+</li>
+<li><p><code>connectionsAllowed</code>. This is only valid for acceptors. It limits the
+number of connections which the acceptor will allow. When this limit
+is reached a DEBUG level message is issued to the log, and the connection
+is refused. The type of client in use will determine what happens when
+the connection is refused. In the case of a <code>core</code> client, it will
+result in a <code>org.apache.activemq.artemis.api.core.ActiveMQConnectionTimedOutException</code>.</p>
+</li>
+</ul>
+<h2 id="configuring-netty-native-transport">Configuring Netty Native Transport</h2>
+<p>Netty Native Transport support exists for selected OS platforms.
+This allows Apache ActiveMQ Artemis to use native sockets/io instead of Java NIO.</p>
+<p>These Native transports add features specific to a particular platform, 
+generate less garbage, and generally improve performance when compared to Java NIO based transport.</p>
+<p>Both Clients and Server can benefit from this.</p>
+<p>Current Supported Platforms.</p>
+<ul>
+<li>Linux running 64bit JVM</li>
+<li>MacOS running 64bit JVM</li>
+</ul>
+<p>Apache ActiveMQ Artemis will by default enable the corresponding native transport if a supported platform is detected.</p>
+<p>If running on an unsupported platform or any issues loading native libs, Apache ActiveMQ Artemis will fallback onto Java NIO.</p>
+<h4 id="linux-native-transport">Linux Native Transport</h4>
+<p>On supported Linux platforms Epoll is used, @see <a href="https://en.wikipedia.org/wiki/Epoll" target="_blank">https://en.wikipedia.org/wiki/Epoll</a>. </p>
+<p>The following properties are specific to this native transport:</p>
+<ul>
+<li><code>useEpoll</code> enables the use of epoll if a supported linux platform is running a 64bit JVM is detected. 
+ Setting this to <code>false</code> will force the use of Java NIO instead of epoll. Default is <code>true</code></li>
+</ul>
+<h4 id="macos-native-transport">MacOS Native Transport</h4>
+<p>On supported MacOS platforms KQueue is used, @see <a href="https://en.wikipedia.org/wiki/Kqueue" target="_blank">https://en.wikipedia.org/wiki/Kqueue</a>. </p>
+<p>The following properties are specific to this native transport:</p>
+<ul>
+<li><code>useKQueue</code> enables the use of kqueue if a supported MacOS platform running a 64bit JVM is detected. 
+ Setting this to <code>false</code> will force the use of Java NIO instead of kqueue. Default is <code>true</code></li>
+</ul>
+<h2 id="configuring-netty-ssl">Configuring Netty SSL</h2>
+<p>Netty SSL is similar to the Netty TCP transport but it provides
+additional security by encrypting TCP connections using the Secure
+Sockets Layer SSL</p>
+<p>Please see the examples for a full working example of using Netty SSL.</p>
+<p>Netty SSL uses all the same properties as Netty TCP but adds the
+following additional properties:</p>
+<ul>
+<li><p><code>sslEnabled</code></p>
+<p>Must be <code>true</code> to enable SSL. Default is <code>false</code>.</p>
+</li>
+<li><p><code>keyStorePath</code></p>
+<p>When used on an <code>acceptor</code> this is the path to the SSL key store on
+the server which holds the server&apos;s certificates (whether
+self-signed or signed by an authority).</p>
+<p>When used on a <code>connector</code> this is the path to the client-side SSL
+key store which holds the client certificates. This is only relevant
+for a <code>connector</code> if you are using 2-way SSL (i.e. mutual
+authentication). Although this value is configured on the server, it
+is downloaded and used by the client. If the client needs to use a
+different path from that set on the server then it can override the
+server-side setting by either using the customary
+&quot;javax.net.ssl.keyStore&quot; system property or the ActiveMQ-specific
+&quot;org.apache.activemq.ssl.keyStore&quot; system property. The
+ActiveMQ-specific system property is useful if another component on
+client is already making use of the standard, Java system property.</p>
+</li>
+<li><p><code>keyStorePassword</code></p>
+<p>When used on an <code>acceptor</code> this is the password for the server-side
+keystore.</p>
+<p>When used on a <code>connector</code> this is the password for the client-side
+keystore. This is only relevant for a <code>connector</code> if you are using
+2-way SSL (i.e. mutual authentication). Although this value can be
+configured on the server, it is downloaded and used by the client.
+If the client needs to use a different password from that set on the
+server then it can override the server-side setting by either using
+the customary &quot;javax.net.ssl.keyStorePassword&quot; system property or
+the ActiveMQ-specific &quot;org.apache.activemq.ssl.keyStorePassword&quot;
+system property. The ActiveMQ-specific system property is useful if
+another component on client is already making use of the standard,
+Java system property.</p>
+</li>
+<li><p><code>trustStorePath</code></p>
+<p>When used on an <code>acceptor</code> this is the path to the server-side SSL
+key store that holds the keys of all the clients that the server
+trusts. This is only relevant for an <code>acceptor</code> if you are using
+2-way SSL (i.e. mutual authentication).</p>
+<p>When used on a <code>connector</code> this is the path to the client-side SSL
+key store which holds the public keys of all the servers that the
+client trusts. Although this value can be configured on the server,
+it is downloaded and used by the client. If the client needs to use
+a different path from that set on the server then it can override
+the server-side setting by either using the customary
+&quot;javax.net.ssl.trustStore&quot; system property or the ActiveMQ-specific
+&quot;org.apache.activemq.ssl.trustStore&quot; system property. The
+ActiveMQ-specific system property is useful if another component on
+client is already making use of the standard, Java system property.</p>
+</li>
+<li><p><code>trustStorePassword</code></p>
+<p>When used on an <code>acceptor</code> this is the password for the server-side
+trust store. This is only relevant for an <code>acceptor</code> if you are
+using 2-way SSL (i.e. mutual authentication).</p>
+<p>When used on a <code>connector</code> this is the password for the client-side
+truststore. Although this value can be configured on the server, it
+is downloaded and used by the client. If the client needs to use a
+different password from that set on the server then it can override
+the server-side setting by either using the customary
+&quot;javax.net.ssl.trustStorePassword&quot; system property or the
+ActiveMQ-specific &quot;org.apache.activemq.ssl.trustStorePassword&quot;
+system property. The ActiveMQ-specific system property is useful if
+another component on client is already making use of the standard,
+Java system property.</p>
+</li>
+<li><p><code>enabledCipherSuites</code></p>
+<p>Whether used on an <code>acceptor</code> or <code>connector</code> this is a comma
+separated list of cipher suites used for SSL communication. The
+default value is <code>null</code> which means the JVM&apos;s default will be used.</p>
+</li>
+<li><p><code>enabledProtocols</code></p>
+<p>Whether used on an <code>acceptor</code> or <code>connector</code> this is a comma
+separated list of protocols used for SSL communication. The default
+value is <code>null</code> which means the JVM&apos;s default will be used.</p>
+</li>
+<li><p><code>needClientAuth</code></p>
+<p>This property is only for an <code>acceptor</code>. It tells a client
+connecting to this acceptor that 2-way SSL is required. Valid values
+are <code>true</code> or <code>false</code>. Default is <code>false</code>.</p>
+</li>
+<li><p><code>verifyHost</code></p>
+<p>When used on an <code>acceptor</code> the <code>CN</code> of the connecting client&apos;s SSL certificate
+will be compared to its hostname to verify they match. This is useful
+only for 2-way SSL.</p>
+<p>When used on a <code>connector</code> the <code>CN</code> of the server&apos;s SSL certificate will be
+compared to its hostname to verify they match. This is useful for both 1-way
+and 2-way SSL.</p>
+<p>Valid values are <code>true</code> or <code>false</code>. Default is <code>false</code>.</p>
+</li>
+<li><p><code>useDefaultSslContext</code></p>
+<p>Only valid on a <code>connector</code>. Allows the <code>connector</code> to use the &quot;default&quot; SSL
+context (via <code>SSLContext.getDefault()</code>) which can be set programmatically by
+the client (via <code>SSLContext.setDefault(SSLContext)</code>). If set to <code>true</code> all
+other SSL related parameters except for <code>sslEnabled</code> are ignored.</p>
+<p>Valid values are <code>true</code> or <code>false</code>. Default is <code>false</code>.</p>
+</li>
+</ul>
+<h2 id="configuring-netty-http">Configuring Netty HTTP</h2>
+<p>Netty HTTP tunnels packets over the HTTP protocol. It can be useful in
+scenarios where firewalls only allow HTTP traffic to pass.</p>
+<p>Please see the examples for a full working example of using Netty HTTP.</p>
+<p>Netty HTTP uses the same properties as Netty TCP but adds the following
+additional properties:</p>
+<ul>
+<li><p><code>httpEnabled</code>. This is now no longer needed. With single port support
+Apache ActiveMQ Artemis will now automatically detect if http is being
+used and configure itself.</p>
+</li>
+<li><p><code>httpClientIdleTime</code>. How long a client can be idle before
+sending an empty http request to keep the connection alive</p>
+</li>
+<li><p><code>httpClientIdleScanPeriod</code>. How often, in milliseconds, to scan
+for idle clients</p>
+</li>
+<li><p><code>httpResponseTime</code>. How long the server can wait before sending an
+empty http response to keep the connection alive</p>
+</li>
+<li><p><code>httpServerScanPeriod</code>. How often, in milliseconds, to scan for
+clients needing responses</p>
+</li>
+<li><p><code>httpRequiresSessionId</code>. If <code>true</code> the client will wait after the
+first call to receive a session id. Used the http connector is
+connecting to servlet acceptor (not recommended)</p>
+</li>
+</ul>
+
+                                
+                                </section>
+                            
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+        <i class="fa fa-circle-o-notch fa-spin"></i>
+        <a href="." >Detecting Dead Connections</a>
+    </h1>
+</div>
+
+
+
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+                                
+                                <h1 id="detecting-dead-connections">Detecting Dead Connections</h1>
+<p>In this section we will discuss connection time-to-live (TTL) and
+explain how Apache ActiveMQ Artemis deals with crashed clients and clients which have
+exited without cleanly closing their resources.</p>
+<h2 id="cleaning-up-dead-connection-resources-on-the-server">Cleaning up Dead Connection Resources on the Server</h2>
+<p>Before an Apache ActiveMQ Artemis client application exits it is considered good
+practice that it should close its resources in a controlled manner,
+using a <code>finally</code> block.</p>
+<p>Here&apos;s an example of a well behaved core client application closing its
+session and session factory in a finally block:</p>
+<pre><code class="lang-java">ServerLocator locator = <span class="hljs-keyword">null</span>;
+ClientSessionFactory sf = <span class="hljs-keyword">null</span>;
+ClientSession session = <span class="hljs-keyword">null</span>;
+
+<span class="hljs-keyword">try</span>
+{
+   locator = ActiveMQClient.createServerLocatorWithoutHA(..);
+
+   sf = locator.createClientSessionFactory();;
+
+   session = sf.createSession(...);
+
+   ... do some stuff with the session...
+}
+<span class="hljs-keyword">finally</span>
+{
+   <span class="hljs-keyword">if</span> (session != <span class="hljs-keyword">null</span>)
+   {
+      session.close();
+   }
+
+   <span class="hljs-keyword">if</span> (sf != <span class="hljs-keyword">null</span>)
+   {
+      sf.close();
+   }
+
+   <span class="hljs-keyword">if</span>(locator != <span class="hljs-keyword">null</span>)
+   {
+      locator.close();
+   }
+}
+</code></pre>
+<p>And here&apos;s an example of a well behaved JMS client application:</p>
+<pre><code class="lang-java">Connection jmsConnection = <span class="hljs-keyword">null</span>;
+
+<span class="hljs-keyword">try</span>
+{
+   ConnectionFactory jmsConnectionFactory = <span class="hljs-keyword">new</span> ActiveMQConnectionFactory(<span class="hljs-string">&quot;tcp://localhost:61616&quot;</span>);
+
+   jmsConnection = jmsConnectionFactory.createConnection();
+
+   ... do some stuff with the connection...
+}
+<span class="hljs-keyword">finally</span>
+{
+   <span class="hljs-keyword">if</span> (connection != <span class="hljs-keyword">null</span>)
+   {
+      connection.close();
+   }
+}
+</code></pre>
+<p>Or with using auto-closeable feature from Java, which can save a few lines of code:</p>
+<pre><code class="lang-java">
+
+<span class="hljs-keyword">try</span> (
+     ActiveMQConnectionFactory jmsConnectionFactory = <span class="hljs-keyword">new</span> ActiveMQConnectionFactory(<span class="hljs-string">&quot;tcp://localhost:61616&quot;</span>);
+     Connection jmsConnection = jmsConnectionFactory.createConnection())
+{
+   ... do some stuff with the connection...
+}
+</code></pre>
+<p>Unfortunately users don&apos;t always write well behaved applications, and
+sometimes clients just crash so they don&apos;t have a chance to clean up
+their resources!</p>
+<p>If this occurs then it can leave server side resources, like sessions,
+hanging on the server. If these were not removed they would cause a
+resource leak on the server and over time this result in the server
+running out of memory or other resources.</p>
+<p>We have to balance the requirement for cleaning up dead client resources
+with the fact that sometimes the network between the client and the
+server can fail and then come back, allowing the client to reconnect.
+Apache ActiveMQ Artemis supports client reconnection, so we don&apos;t want to clean up
+&quot;dead&quot; server side resources too soon or this will prevent any client
+from reconnecting, as it won&apos;t be able to find its old sessions on the
+server.</p>
+<p>Apache ActiveMQ Artemis makes all of this configurable via a <em>connection TTL</em>.
+Basically, the TTL determines how long the server will keep a connection
+alive in the absence of any data arriving from the client. The client will
+automatically send &quot;ping&quot; packets periodically to prevent the server from
+closing it down. If the server doesn&apos;t receive any packets on a connection
+for the connection TTL time, then it will automatically close all the
+sessions on the server that relate to that connection.</p>
+<p>The connection TTL is configured on the URI using the <code>connectionTtl</code>
+parameter.</p>
+<p>The default value for connection ttl on an &quot;unreliable&quot; connection (e.g.
+a Netty connection using the <code>tcp</code> URL scheme) is <code>60000</code>ms, i.e. 1 minute.
+The default value for connection ttl on a &quot;reliable&quot; connection (e.g. an
+in-vm connection using the <code>vm</code> URL scheme) is <code>-1</code>. A value of <code>-1</code> for
+<code>connectionTTL</code> means the server will never time out the connection on
+the server side.</p>
+<p>If you do not wish clients to be able to specify their own connection
+TTL, you can override all values used by a global value set on the
+server side. This can be done by specifying the
+<code>connection-ttl-override</code> attribute in the server side configuration.
+The default value for <code>connection-ttl-override</code> is <code>-1</code> which means &quot;do
+not override&quot; (i.e. let clients use their own values).</p>
+<p>The logic to check connections for TTL violations runs periodically on
+the broker. By default, the checks are done every 2,000 milliseconds.
+However, this can be changed if necessary by using the 
+<code>connection-ttl-check-interval</code> attribute.</p>
+<h2 id="closing-core-sessions-or-jms-connections-that-you-have-failed-to-close">Closing core sessions or JMS connections that you have failed to close</h2>
+<p>As previously discussed, it&apos;s important that all core client sessions
+and JMS connections are always closed explicitly in a <code>finally</code> block
+when you are finished using them.</p>
+<p>If you fail to do so, Apache ActiveMQ Artemis will detect this at garbage collection
+time, and log a warning (If you are using JMS the warning will involve a JMS connection).</p>
+<p>Apache ActiveMQ Artemis will then close the connection / client session for you.</p>
+<p>Note that the log will also tell you the exact line of your user code
+where you created the JMS connection / client session that you later did
+not close. This will enable you to pinpoint the error in your code and
+correct it appropriately.</p>
+<h2 id="detecting-failure-from-the-client-side">Detecting failure from the client side.</h2>
+<p>In the previous section we discussed how the client sends pings to the
+server and how &quot;dead&quot; connection resources are cleaned up by the server.
+There&apos;s also another reason for pinging, and that&apos;s for the <em>client</em> to
+be able to detect that the server or network has failed.</p>
+<p>As long as the client is receiving data from the server it will consider
+the connection to be still alive.</p>
+<p>If the client does not receive any packets for a configurable number
+of milliseconds then it will consider the connection failed and will
+either initiate failover, or call any <code>FailureListener</code> instances (or
+<code>ExceptionListener</code> instances if you are using JMS) depending on how 
+it has been configured.</p>
+<p>This is controlled by setting the <code>clientFailureCheckPeriod</code> parameter
+on the URI your client is using to connect, e.g.
+<code>tcp://localhost:61616?clientFailureCheckPeriod=30000</code>.</p>
+<p>The default value for client failure check period on an &quot;unreliable&quot;
+connection (e.g. a Netty connection) is <code>30000</code> ms, i.e. 30 seconds. The
+default value for client failure check period on a &quot;reliable&quot; connection
+(e.g. an in-vm connection) is <code>-1</code>. A value of <code>-1</code> means the client
+will never fail the connection on the client side if no data is received
+from the server. Typically this is much lower than connection TTL to
+allow clients to reconnect in case of transitory failure.</p>
+<h2 id="configuring-asynchronous-connection-execution">Configuring Asynchronous Connection Execution</h2>
+<p>Most packets received on the server side are executed on the remoting
+thread. These packets represent short-running operations and are always
+executed on the remoting thread for performance reasons.</p>
+<p>However, by default some kinds of packets are executed using a thread
+from a thread pool so that the remoting thread is not tied up for too
+long. Please note that processing operations asynchronously on another
+thread adds a little more latency. These packets are:</p>
+<ul>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.RollbackMessage</code></p>
+</li>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.SessionCloseMessage</code></p>
+</li>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.SessionCommitMessage</code></p>
+</li>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.SessionXACommitMessage</code></p>
+</li>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.SessionXAPrepareMessage</code></p>
+</li>
+<li><p><code>org.apache.activemq.artemis.core.protocol.core.impl.wireformat.SessionXARollbackMessage</code></p>
+</li>
+</ul>
+<p>To disable asynchronous connection execution, set the parameter
+<code>async-connection-execution-enabled</code> in <code>broker.xml</code> to
+<code>false</code> (default value is <code>true</code>).</p>
+
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