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+</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="./images/tomcat.gif" align="right" alt="
       The Apache Tomcat Servlet/JSP Container
-    " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 6.0</font></h1><font face="arial,helvetica,sanserif">Version 6.0.41, May 19 2014</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="./images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="nowrap" class="noPrint"><p><strong>Links</strong></p><ul><li><a href="index.html">Docs Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li></ul><p><strong>User Guide</strong></p><ul><li><a href="introduction.html">1) Introduction</a></li><li><a href="setup.html">2) Setup</a></li><li><a href="appdev/index.html">3) First webapp</a></li><li><a href="deployer-howto.html">4) Deployer</a></li><li><a href="manager-howto.html">5) Manager</a></li><li><a href="realm-howto.html">6) Realms and AAA</a></li><li><a href="security-manager-howto.html">7) Security Manager</a></li><li><a href="jndi-resources-howto.html">8) JNDI Resources</a></li><li><a href="jndi-datasource-examples-howto.html">9) JDBC DataSources</a></li><li><a href="class-loader-howto.html">10) Classloading</a></li><li><a href="jasper-howto.html">11) JSPs</a></li><li><a href="ssl-howto.html">12) SSL</a></li><li><a href="ssi-howto.html">13) SSI</a></li><li><a href="cgi-howto.html">14) CGI</a></li><li><a href="proxy-howto.html">15) Proxy Support</a></li><li><a href="mbeans-descriptor-howto.html">16) MBean Descriptor</a></li><li><a href="default-servlet.html">17) Default Servlet</a></li><li><a href="cluster-howto.html">18) Clustering</a></li><li><a href="balancer-howto.html">19) Load Balancer</a></li><li><a href="connectors.html">20) Connectors</a></li><li><a href="monitoring.html">21) Monitoring and Management</a></li><li><a href="logging.html">22) Logging</a></li><li><a href="apr.html">23) APR/Native</a></li><li><a href="virtual-hosting-howto.html">24) Virtual Hosting</a></li><li><a href="aio.html">25) Advanced IO</a></li><li><a href="extras.html">26) Additional Components</a></li><li><a href="maven-jars.html">27) Mavenized</a></li></ul><p><strong>Reference</strong></p><ul><li><a href="RELEASE-NOTES.txt">Release Notes</a></li><li><a href="config/index.html">Configuration</a></li><li><a href="api/index.html">Javadocs</a></li><li><a href="http://tomcat.apache.org/connectors-doc/">JK 1.2 Documentation</a></li></ul><p><strong>Apache Tomcat Development</strong></p><ul><li><a href="building.html">Building</a></li><li><a href="changelog.html">Changelog</a></li><li><a href="http://wiki.apache.org/tomcat/TomcatVersions">Status</a></li><li><a href="developers.html">Developers</a></li><li><a href="architecture/index.html">Architecture</a></li><li><a href="funcspecs/index.html">Functional Specs.</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>Apache Tomcat 6.0</h1><h2>Clustering/Session Replication HOW-TO</h2><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Important Note"><!--()--></a><a name="Important_Note"><strong>Important Note</strong></a></font></td></tr><tr><td><blockquote>
+    " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.77, Mar 28 2017</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="./images/asf-logo.svg" align="right" alt="Apache Logo" border="0" style="width: 266px;height: 83px;"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="index.html">Docs Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul><p><strong>User Guide</strong></p><ul><li><a href="introduction.html">1) Introduction</a></li><li><a href="setup.html">2) Setup</a></li><li><a href="appdev/index.html">3) First webapp</a></li><li><a href="deployer-howto.html">4) Deployer</a></li><li><a href="manager-howto.html">5) Manager</a></li><li><a href="realm-howto.html">6) Realms and AAA</a></li><li><a href="security-manager-howto.html">7) Security Manager</a></li><li><a href="jndi-resources-howto.html">8) JNDI Resources</a></li><li><a href="jndi-datasource-examples-howto.html">9) JDBC DataSources</a></li><li><a href="class-loader-howto.html">10) Classloading</a></li><li><a href="jasper-howto.html">11) JSPs</a></li><li><a href="ssl-howto.html">12) SSL/TLS</a></li><li><a href="ssi-howto.html">13) SSI</a></li><li><a href="cgi-howto.html">14) CGI</a></li><li><a href="proxy-howto.html">15) Proxy Support</a></li><li><a href="mbeans-descriptors-howto.html">16) MBeans Descriptors</a></li><li><a href="default-servlet.html">17) Default Servlet</a></li><li><a href="cluster-howto.html">18) Clustering</a></li><li><a href="balancer-howto.html">19) Load Balancer</a></li><li><a href="connectors.html">20) Connectors</a></li><li><a href="monitoring.html">21) Monitoring and Management</a></li><li><a href="logging.html">22) Logging</a></li><li><a href="apr.html">23) APR/Native</a></li><li><a href="virtual-hosting-howto.html">24) Virtual Hosting</a></li><li><a href="aio.html">25) Advanced IO</a></li><li><a href="extras.html">26) Additional Components</a></li><li><a href="maven-jars.html">27) Mavenized</a></li><li><a href="security-howto.html">28) Security Considerations</a></li><li><a href="windows-service-howto.html">29) Windows Service</a></li><li><a href="windows-auth-howto.html">30) Windows Authentication</a></li><li><a href="jdbc-pool.html">31) Tomcat's JDBC Pool</a></li><li><a href="web-socket-howto.html">32) WebSocket</a></li></ul><p><strong>Reference</strong></p><ul><li><a href="RELEASE-NOTES.txt">Release Notes</a></li><li><a href="config/index.html">Configuration</a></li><li><a href="api/index.html">Tomcat Javadocs</a></li><li><a href="servletapi/index.html">Servlet Javadocs</a></li><li><a href="jspapi/index.html">JSP 2.2 Javadocs</a></li><li><a href="elapi/index.html">EL 2.2 Javadocs</a></li><li><a href="websocketapi/index.html">WebSocket 1.1 Javadocs</a></li><li><a href="http://tomcat.apache.org/connectors-doc/">JK 1.2 Documentation</a></li></ul><p><strong>Apache Tomcat Development</strong></p><ul><li><a href="building.html">Building</a></li><li><a href="changelog.html">Changelog</a></li><li><a href="http://wiki.apache.org/tomcat/TomcatVersions">Status</a></li><li><a href="developers.html">Developers</a></li><li><a href="architecture/index.html">Architecture</a></li><li><a href="funcspecs/index.html">Functional Specs.</a></li><li><a href="tribes/introduction.html">Tribes</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>Clustering/Session Replication HOW-TO</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Important Note"><!--()--></a><a name="Important_Note"><strong>Important Note</strong></a></font></td></tr><tr><td><blockquote>
 <p><b>You can also check the <a href="config/cluster.html">configuration reference documentation.</a></b>
 </p>
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote>
-<ul><li><a href="#For_the_impatient">For the impatient</a></li><li><a href="#Cluster_Basics">Cluster Basics</a></li><li><a href="#Overview">Overview</a></li><li><a href="#Cluster_Information">Cluster Information</a></li><li><a href="#Bind_session_after_crash_to_failover_node">Bind session after crash to failover node</a></li><li><a href="#Configuration_Example">Configuration Example</a></li><li><a href="#Cluster_Architecture">Cluster Architecture</a></li><li><a href="#How_it_Works">How it Works</a></li><li><a href="#FAQ">FAQ</a></li></ul>
+<ul><li><a href="#For_the_impatient">For the impatient</a></li><li><a href="#Security">Security</a></li><li><a href="#Cluster_Basics">Cluster Basics</a></li><li><a href="#Overview">Overview</a></li><li><a href="#Cluster_Information">Cluster Information</a></li><li><a href="#Bind_session_after_crash_to_failover_node">Bind session after crash to failover node</a></li><li><a href="#Configuration_Example">Configuration Example</a></li><li><a href="#Cluster_Architecture">Cluster Architecture</a></li><li><a href="#How_it_Works">How it Works</a></li><li><a href="#Monitoring_your_Cluster_with_JMX">Monitoring your Cluster with JMX</a></li><li><a href="#FAQ">FAQ</a></li></ul>
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="For the impatient"><!--()--></a><a name="For_the_impatient"><strong>For the impatient</strong></a></font></td></tr><tr><td><blockquote>
   <p>
-    Simply add <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>&lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/&gt;</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+    Simply add
+  </p>
+  <div class="codeBox"><pre><code>&lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/&gt;</code></pre></div>
+  <p>
     to your <code>&lt;Engine&gt;</code> or your <code>&lt;Host&gt;</code> element to enable clustering.
   </p>
   <p>
     Using the above configuration will enable all-to-all session replication
-    using the <code>DeltaManager</code> to replicate session deltas. By all-to-all we mean that the session gets replicated to all the other 
-    nodes in the cluster. This works great for smaller cluster but we don't recommend it for larger clusters(a lot of tomcat nodes).
+    using the <code>DeltaManager</code> to replicate session deltas. By all-to-all we mean that the session gets replicated to all the other
+    nodes in the cluster. This works great for smaller cluster but we don't recommend it for larger clusters(a lot of Tomcat nodes).
     Also when using the delta manager it will replicate to all nodes, even nodes that don't have the application deployed.<br>
     To get around this problem, you'll want to use the BackupManager. This manager only replicates the session data to one backup
     node, and only to nodes that have the application deployed. Downside of the BackupManager: not quite as battle tested as the delta manager.
-    <br>
-    Here are some of the important default values:<br>
-    1. Multicast address is 228.0.0.4<br>
-    2. Multicast port is 45564 (the port and the address together determine cluster membership.<br>
-    3. The IP broadcasted is <code>java.net.InetAddress.getLocalHost().getHostAddress()</code> (make sure you don't broadcast 127.0.0.1, this is a common error)<br>
-    4. The TCP port listening for replication messages is the first available server socket in range <code>4000-4100</code><br>
-    5. Two listeners are configured <code>ClusterSessionListener</code> and <code>JvmRouteSessionIDBinderListener</code><br>
-    6. Two interceptors are configured <code>TcpFailureDetector</code> and <code>MessageDispatch15Interceptor</code><br>
-    The following is the default cluster configuration:<br>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
+  </p>
+  <p>
+    Here are some of the important default values:
+  </p>
+  <ol>
+    <li>Multicast address is 228.0.0.4</li>
+    <li>Multicast port is 45564 (the port and the address together determine cluster membership.</li>
+    <li>The IP broadcasted is <code>java.net.InetAddress.getLocalHost().getHostAddress()</code> (make sure you don't broadcast 127.0.0.1, this is a common error)</li>
+    <li>The TCP port listening for replication messages is the first available server socket in range <code>4000-4100</code></li>
+    <li>Listener is configured <code>ClusterSessionListener</code></li>
+    <li>Two interceptors are configured <code>TcpFailureDetector</code> and <code>MessageDispatch15Interceptor</code></li>
+  </ol>
+  <p>
+    The following is the default cluster configuration:
+  </p>
+  <div class="codeBox"><pre><code>        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
                  channelSendOptions="8"&gt;
 
           &lt;Manager className="org.apache.catalina.ha.session.DeltaManager"
@@ -67,21 +150,33 @@
                     watchDir="/tmp/war-listen/"
                     watchEnabled="false"/&gt;
 
-          &lt;ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/&gt;
-          &lt;ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/&gt;
-        &lt;/Cluster&gt;    
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
-  </p>
+          &lt;ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"&gt;
+          &lt;ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"&gt;
+        &lt;/Cluster&gt;</code></pre></div>
   <p>Will cover this section in more detail later in this document.</p>
+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Security"><strong>Security</strong></a></font></td></tr><tr><td><blockquote>
+
+<p>The cluster implementation is written on the basis that a secure, trusted
+network is used for all of the cluster related network traffic. It is not safe
+to run a cluster on a insecure, untrusted network.</p>
+
+<p>There are many options for providing a secure, trusted network for use by a
+Tomcat cluster. These include:</p>
+<ul>
+  <li>private LAN</li>
+  <li>a Virtual Private Network (VPN)</li>
+  <li>IPSEC</li>
+</ul>
+
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Cluster Basics"><!--()--></a><a name="Cluster_Basics"><strong>Cluster Basics</strong></a></font></td></tr><tr><td><blockquote>
 
-<p>To run session replication in your Tomcat 6.0 container, the following steps
+<p>To run session replication in your Tomcat 7.0 container, the following steps
 should be completed:</p>
 <ul>
   <li>All your session attributes must implement <code>java.io.Serializable</code></li>
   <li>Uncomment the <code>Cluster</code> element in server.xml</li>
   <li>If you have defined custom cluster valves, make sure you have the <code>ReplicationValve</code>  defined as well under the Cluster element in server.xml</li>
-  <li>If your Tomcat instances are running on the same machine, make sure the <code>tcpListenPort</code>
+  <li>If your Tomcat instances are running on the same machine, make sure the <code>Receiver.port</code>
       attribute is unique for each instance, in most cases Tomcat is smart enough to resolve this on it's own by autodetecting available ports in the range 4000-4100</li>
   <li>Make sure your <code>web.xml</code> has the
       <code>&lt;distributable/&gt;</code> element</li>
@@ -95,37 +190,35 @@
 <p>Note: Remember that your session state is tracked by a cookie, so your URL must look the same from the out
    side otherwise, a new session will be created.</p>
 <p>Note: Clustering support currently requires the JDK version 1.5 or later.</p>
-<p>The Cluster module uses the Tomcat JULI logging framework, so you can configure logging 
-   through the regular logging.properties file. To track messages, you can enable logging on the key:<code>org.apache.catalina.tribes.MESSAGES</code></p>
+<p>The Cluster module uses the Tomcat JULI logging framework, so you can configure logging
+   through the regular logging.properties file. To track messages, you can enable logging on the key: <code>org.apache.catalina.tribes.MESSAGES</code></p>
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Overview"><strong>Overview</strong></a></font></td></tr><tr><td><blockquote>
 
 <p>To enable session replication in Tomcat, three different paths can be followed to achieve the exact same thing:</p>
 <ol>
   <li>Using session persistence, and saving the session to a shared file system (PersistenceManager + FileStore)</li>
   <li>Using session persistence, and saving the session to a shared database (PersistenceManager + JDBCStore)</li>
-  <li>Using in-memory-replication, using the SimpleTcpCluster that ships with Tomcat 6 (lib/catalina-tribes.jar + lib/catalina-ha.jar)</li>
+  <li>Using in-memory-replication, using the SimpleTcpCluster that ships with Tomcat (lib/catalina-tribes.jar + lib/catalina-ha.jar)</li>
 </ol>
 
-<p>In this release of session replication, Tomcat can perform an all-to-all replication of session state using the <code>DeltaManager</code> or 
+<p>In this release of session replication, Tomcat can perform an all-to-all replication of session state using the <code>DeltaManager</code> or
    perform backup replication to only one node using the <code>BackupManager</code>.
-   The all-to-all replication is an algorithm that is only efficient when the clusters are small. For larger clusters,  to use 
+   The all-to-all replication is an algorithm that is only efficient when the clusters are small. For larger clusters,  to use
    a primary-secondary session replication where the session will only be stored at one backup server simply setup the BackupManager. <br>
    Currently you can use the domain worker attribute (mod_jk &gt; 1.2.8) to build cluster partitions
-   with the potential of having a more scaleable cluster solution with the DeltaManager(you'll need to configure the domain interceptor for this).
+   with the potential of having a more scalable cluster solution with the DeltaManager(you'll need to configure the domain interceptor for this).
    In order to keep the network traffic down in an all-to-all environment, you can split your cluster
    into smaller groups. This can be easily achieved by using different multicast addresses for the different groups.
    A very simple setup would look like this:
    </p>
 
-<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-        DNS Round Robin
+<div class="codeBox"><pre><code>        DNS Round Robin
                |
          Load Balancer
           /           \
       Cluster1      Cluster2
       /     \        /     \
-  Tomcat1 Tomcat2  Tomcat3 Tomcat4
-</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+  Tomcat1 Tomcat2  Tomcat3 Tomcat4</code></pre></div>
 
 <p>What is important to mention here, is that session replication is only the beginning of clustering.
    Another popular concept used to implement clusters is farming, i.e., you deploy your apps only to one
@@ -134,12 +227,12 @@
 <p>In the next section will go deeper into how session replication works and how to configure it.</p>
 
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Cluster Information"><!--()--></a><a name="Cluster_Information"><strong>Cluster Information</strong></a></font></td></tr><tr><td><blockquote>
-<p>Membership is established using multicast heartbeats. 
-   Hence, if you wish to subdivide your clusters, you can do this by 
+<p>Membership is established using multicast heartbeats.
+   Hence, if you wish to subdivide your clusters, you can do this by
    changing the multicast IP address or port in the <code>&lt;Membership&gt;</code> element.
 </p>
 <p>
-   The heartbeat contains the IP address of the Tomcat node and the TCP port that 
+   The heartbeat contains the IP address of the Tomcat node and the TCP port that
    Tomcat listens to for replication traffic. All data communication happens over TCP.
 </p>
 <p>
@@ -153,27 +246,27 @@
     sent over the wire and reinstantiated on all the other cluster nodes.
     Synchronous vs. asynchronous is configured using the <code>channelSendOptions</code>
     flag and is an integer value. The default value for the <code>SimpleTcpCluster/DeltaManager</code> combo is
-    8, which is asynchronous. You can read more on the <a href="tribes/introduction.html">send flag(overview)</a> or the 
-    <a href="http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/catalina/tribes/Channel.html">send flag(javadoc)</a>.
+    8, which is asynchronous. You can read more on the <a href="tribes/introduction.html">send flag(overview)</a> or the
+    <a href="http://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/tribes/Channel.html">send flag(javadoc)</a>.
     During async replication, the request is returned before the data has been replicated. async replication yields shorter
     request times, and synchronous replication guarantees the session to be replicated before the request returns.
 </p>
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Bind session after crash to failover node"><!--()--></a><a name="Bind_session_after_crash_to_failover_node"><strong>Bind session after crash to failover node</strong></a></font></td></tr><tr><td><blockquote>
 <p>
-    If you are using mod_jk and not using sticky sessions or for some reasons sticky session don't 
-    work, or you are simply failing over, the session id will need to be modified as it previously contained 
+    If you are using mod_jk and not using sticky sessions or for some reasons sticky session don't
+    work, or you are simply failing over, the session id will need to be modified as it previously contained
     the worker id of the previous tomcat (as defined by jvmRoute in the Engine element).
     To solve this, we will use the JvmRouteBinderValve.
 </p>
-<p> 
+<p>
     The JvmRouteBinderValve rewrites the session id to ensure that the next request will remain sticky
     (and not fall back to go to random nodes since the worker is no longer available) after a fail over.
     The valve rewrites the JSESSIONID value in the cookie with the same name.
-    Not having this valve in place, will make it harder to ensure stickyness in case of a failure for the mod_jk module.
+    Not having this valve in place, will make it harder to ensure stickiness in case of a failure for the mod_jk module.
 </p>
 <p>
     By default, if no valves are configured, the JvmRouteBinderValve is added on.
-    The cluster message listener called JvmRouteSessionIDBinderListener is also defined by default and is used to actually rewrite the 
+    The cluster message listener called JvmRouteSessionIDBinderListener is also defined by default and is used to actually rewrite the
     session id on the other nodes in the cluster once a fail over has occurred.
     Remember, if you are adding your own valves or cluster listeners in server.xml then the defaults are no longer valid,
     make sure that you add in all the appropriate valves and listeners as defined by the default.
@@ -181,21 +274,19 @@
 <p>
     <b>Hint:</b><br>
     With attribute <i>sessionIdAttribute</i> you can change the request attribute name that included the old session id.
-    Default attribute name is <i>org.apache.catalina.cluster.session.JvmRouteOrignalSessionID</i>.
+    Default attribute name is <i>org.apache.catalina.ha.session.JvmRouteOrignalSessionID</i>.
 </p>
 <p>
     <b>Trick:</b><br>
     You can enable this mod_jk turnover mode via JMX before you drop a node to all backup nodes!
-    Set enable true on all JvmRouteBinderValve backups, disable worker at mod_jk 
-    and then drop node and restart it! Then enable mod_jk Worker and disable JvmRouteBinderValves again. 
+    Set enable true on all JvmRouteBinderValve backups, disable worker at mod_jk
+    and then drop node and restart it! Then enable mod_jk Worker and disable JvmRouteBinderValves again.
     This use case means that only requested session are migrated.
 </p>
 
 
-
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Configuration Example"><!--()--></a><a name="Configuration_Example"><strong>Configuration Example</strong></a></font></td></tr><tr><td><blockquote>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
+    <div class="codeBox"><pre><code>        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
                  channelSendOptions="6"&gt;
 
           &lt;Manager className="org.apache.catalina.ha.session.BackupManager"
@@ -206,7 +297,7 @@
           &lt;Manager className="org.apache.catalina.ha.session.DeltaManager"
                    expireSessionsOnShutdown="false"
                    notifyListenersOnReplication="true"/&gt;
-          --&gt;        
+          --&gt;
           &lt;Channel className="org.apache.catalina.tribes.group.GroupChannel"&gt;
             &lt;Membership className="org.apache.catalina.tribes.membership.McastService"
                         address="228.0.0.4"
@@ -228,7 +319,7 @@
           &lt;/Channel&gt;
 
           &lt;Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
-                 filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/&gt;
+                 filter=".*\.gif|.*\.js|.*\.jpeg|.*\.jpg|.*\.png|.*\.htm|.*\.html|.*\.css|.*\.txt"/&gt;
 
           &lt;Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
                     tempDir="/tmp/war-temp/"
@@ -237,27 +328,23 @@
                     watchEnabled="false"/&gt;
 
           &lt;ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/&gt;
-        &lt;/Cluster&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+        &lt;/Cluster&gt;</code></pre></div>
     <p>
       Break it down!!
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
-                 channelSendOptions="6"&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+    <div class="codeBox"><pre><code>        &lt;Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
+                 channelSendOptions="6"&gt;</code></pre></div>
     <p>
       The main element, inside this element all cluster details can be configured.
       The <code>channelSendOptions</code> is the flag that is attached to each message sent by the
       SimpleTcpCluster class or any objects that are invoking the SimpleTcpCluster.send method.
-      The description of the send flags is available at <a href="http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/catalina/tribes/Channel.html">
+      The description of the send flags is available at <a href="http://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/tribes/Channel.html">
       our javadoc site</a>
       The <code>DeltaManager</code> sends information using the SimpleTcpCluster.send method, while the backup manager
       sends it itself directly through the channel.
       <br>For more info, Please visit the <a href="config/cluster.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-          &lt;Manager className="org.apache.catalina.ha.session.BackupManager"
+    <div class="codeBox"><pre><code>          &lt;Manager className="org.apache.catalina.ha.session.BackupManager"
                    expireSessionsOnShutdown="false"
                    notifyListenersOnReplication="true"
                    mapSendOptions="6"/&gt;
@@ -265,50 +352,43 @@
           &lt;Manager className="org.apache.catalina.ha.session.DeltaManager"
                    expireSessionsOnShutdown="false"
                    notifyListenersOnReplication="true"/&gt;
-          --&gt;        
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+          --&gt;</code></pre></div>
     <p>
         This is a template for the manager configuration that will be used if no manager is defined in the &lt;Context&gt;
         element. In Tomcat 5.x each webapp marked distributable had to use the same manager, this is no longer the case
-        since Tomcat 6 you can define a manager class for each webapp, so that you can mix managers in your cluster.
+        since Tomcat you can define a manager class for each webapp, so that you can mix managers in your cluster.
         Obviously the managers on one node's application has to correspond with the same manager on the same application on the other node.
-        If no manager has been specified for the webapp, and the webapp is marked &lt;distributable/&gt; Tomcat will take this manager configuration 
+        If no manager has been specified for the webapp, and the webapp is marked &lt;distributable/&gt; Tomcat will take this manager configuration
         and create a manager instance cloning this configuration.
         <br>For more info, Please visit the <a href="config/cluster-manager.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-          &lt;Channel className="org.apache.catalina.tribes.group.GroupChannel"&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+    <div class="codeBox"><pre><code>          &lt;Channel className="org.apache.catalina.tribes.group.GroupChannel"&gt;</code></pre></div>
     <p>
         The channel element is <a href="tribes/introduction.html">Tribes</a>, the group communication framework
         used inside Tomcat. This element encapsulates everything that has to do with communication and membership logic.
         <br>For more info, Please visit the <a href="config/cluster-channel.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-            &lt;Membership className="org.apache.catalina.tribes.membership.McastService"
+    <div class="codeBox"><pre><code>            &lt;Membership className="org.apache.catalina.tribes.membership.McastService"
                         address="228.0.0.4"
                         port="45564"
                         frequency="500"
-                        dropTime="3000"/&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+                        dropTime="3000"/&gt;</code></pre></div>
     <p>
-        Membership is done using multicasting. Please note that Tribes also supports static memberships using the 
+        Membership is done using multicasting. Please note that Tribes also supports static memberships using the
         <code>StaticMembershipInterceptor</code> if you want to extend your membership to points beyond multicasting.
         The address attribute is the multicast address used and the port is the multicast port. These two together
         create the cluster separation. If you want a QA cluster and a production cluster, the easiest config is to
-        have the QA cluster be on a separate multicast address/port combination the the production cluster.<br>
-        The membership component broadcasts TCP adress/port of itselt to the other nodes so that communication between
-        nodes can be done over TCP. Please note that the address being broadcasted is the one of the 
+        have the QA cluster be on a separate multicast address/port combination than the production cluster.<br>
+        The membership component broadcasts TCP address/port of itself to the other nodes so that communication between
+        nodes can be done over TCP. Please note that the address being broadcasted is the one of the
         <code>Receiver.address</code> attribute.
         <br>For more info, Please visit the <a href="config/cluster-membership.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-            &lt;Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
+    <div class="codeBox"><pre><code>            &lt;Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                       address="auto"
                       port="5000"
                       selectorTimeout="100"
-                      maxThreads="6"/&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+                      maxThreads="6"/&gt;</code></pre></div>
     <p>
         In tribes the logic of sending and receiving data has been broken into two functional components. The Receiver, as the name suggests
         is responsible for receiving messages. Since the Tribes stack is thread less, (a popular improvement now adopted by other frameworks as well),
@@ -316,15 +396,12 @@
         The address attribute is the host address that will be broadcasted by the membership component to the other nodes.
         <br>For more info, Please visit the <a href="config/cluster-receiver.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-
-            &lt;Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter"&gt;
+    <div class="codeBox"><pre><code>            &lt;Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter"&gt;
               &lt;Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/&gt;
-            &lt;/Sender&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+            &lt;/Sender&gt;</code></pre></div>
     <p>
         The sender component, as the name indicates is responsible for sending messages to other nodes.
-        The sender has a shell component, the <code>ReplicationTransmitter</code> but the real stuff done is done in the 
+        The sender has a shell component, the <code>ReplicationTransmitter</code> but the real stuff done is done in the
         sub component, <code>Transport</code>.
         Tribes support having a pool of senders, so that messages can be sent in parallel and if using the NIO sender,
         you can send messages concurrently as well.<br>
@@ -332,76 +409,67 @@
         at the same time.
         <br>For more info, Please visit the <a href="config/cluster-sender.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-            &lt;Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/&gt;
+    <div class="codeBox"><pre><code>            &lt;Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/&gt;
             &lt;Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/&gt;
             &lt;Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/&gt;
-          &lt;/Channel&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+          &lt;/Channel&gt;</code></pre></div>
     <p>
-        Tribes uses a stack to send messages through. Each element in the stack is called an interceptor, and works much like the valves do 
+        Tribes uses a stack to send messages through. Each element in the stack is called an interceptor, and works much like the valves do
         in the Tomcat servlet container.
-        Using interceptors, logic can be broken into more managable pieces of code. The interceptors configured above are:<br>
+        Using interceptors, logic can be broken into more manageable pieces of code. The interceptors configured above are:<br>
         TcpFailureDetector - verifies crashed members through TCP, if multicast packets get dropped, this interceptor protects against false positives,
         ie the node marked as crashed even though it still is alive and running.<br>
-        MessageDispatch15Interceptor - dispatches messages to a thread (thread pool) to send message asynchrously.<br>
+        MessageDispatch15Interceptor - dispatches messages to a thread (thread pool) to send message asynchronously.<br>
         ThroughputInterceptor - prints out simple stats on message traffic.<br>
-        Please note that the order of interceptors is important. the way they are defined in server.xml is the way they are represented in the 
+        Please note that the order of interceptors is important. The way they are defined in server.xml is the way they are represented in the
         channel stack. Think of it as a linked list, with the head being the first most interceptor and the tail the last.
         <br>For more info, Please visit the <a href="config/cluster-interceptor.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-          &lt;Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
-                 filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+    <div class="codeBox"><pre><code>          &lt;Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
+                 filter=".*\.gif|.*\.js|.*\.jpeg|.*\.jpg|.*\.png|.*\.htm|.*\.html|.*\.css|.*\.txt"/&gt;</code></pre></div>
     <p>
         The cluster uses valves to track requests to web applications, we've mentioned the ReplicationValve and the JvmRouteBinderValve above.
         The &lt;Cluster&gt; element itself is not part of the pipeline in Tomcat, instead the cluster adds the valve to its parent container.
         If the &lt;Cluster&gt; elements is configured in the &lt;Engine&gt; element, the valves get added to the engine and so on.
         <br>For more info, Please visit the <a href="config/cluster-valve.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-          &lt;Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
+    <div class="codeBox"><pre><code>          &lt;Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
                     tempDir="/tmp/war-temp/"
                     deployDir="/tmp/war-deploy/"
                     watchDir="/tmp/war-listen/"
-                    watchEnabled="false"/&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+                    watchEnabled="false"/&gt;</code></pre></div>
     <p>
         The default tomcat cluster supports farmed deployment, ie, the cluster can deploy and undeploy applications on the other nodes.
-        The state of this component is currently in flux but will be addressed soon. There was a change in the deployment algorithm 
-        between Tomcat 5.0 and 5.5 and at that point, the logic of this component changed to where the deploy dir has to match the 
+        The state of this component is currently in flux but will be addressed soon. There was a change in the deployment algorithm
+        between Tomcat 5.0 and 5.5 and at that point, the logic of this component changed to where the deploy dir has to match the
         webapps directory.
         <br>For more info, Please visit the <a href="config/cluster-deployer.html">reference documentation</a>
     </p>
-    <div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-          &lt;ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/&gt;
-        &lt;/Cluster&gt;
-    </pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
+    <div class="codeBox"><pre><code>          &lt;ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/&gt;
+        &lt;/Cluster&gt;</code></pre></div>
     <p>
-        Since the SimpleTcpCluster itself is a sender and receiver of the Channel object, components can register themselves as listeners to 
+        Since the SimpleTcpCluster itself is a sender and receiver of the Channel object, components can register themselves as listeners to
         the SimpleTcpCluster. The listener above <code>ClusterSessionListener</code> listens for DeltaManager replication messages
         and applies the deltas to the manager that in turn applies it to the session.
         <br>For more info, Please visit the <a href="config/cluster-listener.html">reference documentation</a>
     </p>
-    
+
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Cluster Architecture"><!--()--></a><a name="Cluster_Architecture"><strong>Cluster Architecture</strong></a></font></td></tr><tr><td><blockquote>
 
-<p><b>Component Levels:</b>
-<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
-         Server
+<p><b>Component Levels:</b></p>
+<div class="codeBox"><pre><code>         Server
            |
          Service
            |
          Engine
-           |  \ 
+           |  \
            |  --- Cluster --*
            |
          Host
            |
          ------
         /      \
-     Cluster    Context(1-N)                 
+     Cluster    Context(1-N)
         |             \
         |             -- Manager
         |                   \
@@ -422,22 +490,21 @@
                                          -- Valve
                                          |      \
                                          |       -- ReplicationValve
-                                         |       -- JvmRouteBinderValve 
+                                         |       -- JvmRouteBinderValve
                                          |
-                                         -- LifecycleListener 
+                                         -- LifecycleListener
                                          |
-                                         -- ClusterListener 
+                                         -- ClusterListener
                                          |      \
                                          |       -- ClusterSessionListener
                                          |       -- JvmRouteSessionIDBinderListener
                                          |
-                                         -- Deployer 
+                                         -- Deployer
                                                 \
                                                  -- FarmWarDeployer
-      
-      
-</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
-</p>
+
+</code></pre></div>
+
 
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="How it Works"><!--()--></a><a name="How_it_Works"><strong>How it Works</strong></a></font></td></tr><tr><td><blockquote>
 <p>To make it easy to understand how clustering works, We are gonna take you through a series of scenarios.
@@ -456,7 +523,7 @@
 <li><code>TomcatA</code> The session <code>S2</code> expires due to inactivity.</li>
 </ol>
 
-<p>Ok, now that we have a good sequence, we will take you through exactly what happens in the session repliction code</p>
+<p>Ok, now that we have a good sequence, we will take you through exactly what happens in the session replication code</p>
 
 <ol>
 <li><b><code>TomcatA</code> starts up</b>
@@ -468,7 +535,7 @@
         Tomcat will create a <code>DeltaManager</code> for that context instead of a <code>StandardManager</code>.
         The cluster class will start up a membership service (multicast) and a replication service (tcp unicast).
         More on the architecture further down in this document.
-    </p><p></p>
+    </p>
 </li>
 <li><b><code>TomcatB</code> starts up</b>
     <p>
@@ -481,21 +548,21 @@
         entry. The session state gets transferred for each web application that has distributable in
         its web.xml. Note: To use session replication efficiently, all your tomcat instances should be
         configured the same.
-    </p><p></p>
+    </p>
 </li>
 <li><B><code>TomcatA</code> receives a request, a session <code>S1</code> is created.</B>
     <p>
         The request coming in to TomcatA is treated exactly the same way as without session replication.
         The action happens when the request is completed, the <code>ReplicationValve</code> will intercept
         the request before the response is returned to the user.
-        At this point it finds that the session has been modified, and it uses TCP to replicata the
+        At this point it finds that the session has been modified, and it uses TCP to replicate the
         session to TomcatB. Once the serialized data has been handed off to the operating systems TCP logic,
         the request returns to the user, back through the valve pipeline.
         For each request the entire session is replicated, this allows code that modifies attributes
         in the session without calling setAttribute or removeAttribute to be replicated.
         a useDirtyFlag configuration parameter can be used to optimize the number of times
         a session is replicated.
-    </p><p></p>
+    </p>
 
 </li>
 <li><b><code>TomcatA</code> crashes</b>
@@ -505,11 +572,11 @@
         be notified of any changes that occurs in TomcatB.
         The load balancer will redirect the requests from TomcatA to TomcatB and all the sessions
         are current.
-    </p><p></p>
+    </p>
 </li>
 <li><b><code>TomcatB</code> receives a request for session <code>S1</code></b>
     <p>Nothing exciting, TomcatB will process the request as any other request.
-    </p><p></p>
+    </p>
 </li>
 <li><b><code>TomcatA</code> starts up</b>
     <p>Upon start up, before TomcatA starts taking new request and making itself
@@ -517,27 +584,27 @@
     It will join the cluster, contact TomcatB for the current state of all the sessions.
     And once it receives the session state, it finishes loading and opens its HTTP/mod_jk ports.
     So no requests will make it to TomcatA until it has received the session state from TomcatB.
-    </p><p></p>
+    </p>
 </li>
 <li><b><code>TomcatA</code> receives a request, invalidate is called on the session (<code>S1</code>)</b>
-    <p>The invalidate is call is intercepted, and the session is queued with invalidated sessions.
+    <p>The invalidate call is intercepted, and the session is queued with invalidated sessions.
         When the request is complete, instead of sending out the session that has changed, it sends out
         an "expire" message to TomcatB and TomcatB will invalidate the session as well.
-    </p><p></p>
+    </p>
 
 </li>
 <li><b><code>TomcatB</code> receives a request, for a new session (<code>S2</code>)</b>
     <p>Same scenario as in step 3)
-    </p><p></p>
+    </p>
 
 
 </li>
 <li><code>TomcatA</code> The session <code>S2</code> expires due to inactivity.
-    <p>The invalidate is call is intercepted the same was as when a session is invalidated by the user,
+    <p>The invalidate call is intercepted the same was as when a session is invalidated by the user,
        and the session is queued with invalidated sessions.
-       At this point, the invalidet session will not be replicated across until
+       At this point, the invalidated session will not be replicated across until
        another request comes through the system and checks the invalid queue.
-    </p><p></p>
+    </p>
 </li>
 </ol>
 
@@ -565,12 +632,103 @@
     Tomcat does not keep session instances in sync across the cluster.
     The implementation of such logic would be to much overhead and cause all
     kinds of problems. If your client accesses the same session
-    simultanously using multiple requests, then the last request
+    simultaneously using multiple requests, then the last request
     will override the other sessions in the cluster.
 </p>
 
+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Monitoring your Cluster with JMX"><!--()--></a><a name="Monitoring_your_Cluster_with_JMX"><strong>Monitoring your Cluster with JMX</strong></a></font></td></tr><tr><td><blockquote>
+<p>Monitoring is a very important question when you use a cluster. Some of the cluster objects are JMX MBeans </p>
+<p>Add the following parameter to your startup script with Java 5:</p>
+<div class="codeBox"><pre><code>set CATALINA_OPTS=\
+-Dcom.sun.management.jmxremote \
+-Dcom.sun.management.jmxremote.port=%my.jmx.port% \
+-Dcom.sun.management.jmxremote.ssl=false \
+-Dcom.sun.management.jmxremote.authenticate=false</code></pre></div>
+
+<p>
+  List of Cluster Mbeans
+</p>
+<table class="defaultTable">
+
+  <tr>
+    <th>Name</th>
+    <th>Description</th>
+    <th>MBean ObjectName - Engine</th>
+    <th>MBean ObjectName - Host</th>
+  </tr>
+
+  <tr>
+    <td>Cluster</td>
+    <td>The complete cluster element</td>
+    <td><code>type=Cluster</code></td>
+    <td><code>type=Cluster,host=${HOST}</code></td>
+  </tr>
+
+  <tr>
+    <td>DeltaManager</td>
+    <td>This manager control the sessions and handle session replication </td>
+    <td><code>type=Manager,context=${APP.CONTEXT.PATH}, host=${HOST}</code></td>
+    <td><code>type=Manager,context=${APP.CONTEXT.PATH}, host=${HOST}</code></td>
+  </tr>
+
+  <tr>
+    <td>FarmWarDeployer</td>
+    <td>Manages the process of deploying an application to all nodes in the cluster</td>
+    <td>Not supported</td>
+    <td><code>type=Cluster, host=${HOST}, component=deployer</code></td>
+  </tr>
+
+  <tr>
+    <td>Member</td>
+    <td>Represents a node in the cluster</td>
+    <td>type=Cluster, component=member, name=${NODE_NAME}</td>
+    <td><code>type=Cluster, host=${HOST}, component=member, name=${NODE_NAME}</code></td>
+  </tr>
+
+  <tr>
+    <td>ReplicationValve</td>
+    <td>This valve control the replication to the backup nodes</td>
+    <td><code>type=Valve,name=ReplicationValve</code></td>
+    <td><code>type=Valve,name=ReplicationValve,host=${HOST}</code></td>
+  </tr>
+
+  <tr>
+    <td>JvmRouteBinderValve</td>
+    <td>This is a cluster fallback valve to change the Session ID to the current tomcat jvmroute.</td>
+    <td><code>type=Valve,name=JvmRouteBinderValve,
+              context=${APP.CONTEXT.PATH}</code></td>
+    <td><code>type=Valve,name=JvmRouteBinderValve,host=${HOST},
+              context=${APP.CONTEXT.PATH}</code></td>
+  </tr>
+
+</table>
 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="FAQ"><strong>FAQ</strong></a></font></td></tr><tr><td><blockquote>
 <p>Please see <a href="http://wiki.apache.org/tomcat/FAQ/Clustering">the clustering section of the FAQ</a>.</p>
-</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
-        Copyright &copy; 1999-2014, Apache Software Foundation
+</blockquote></td></tr></table></td></tr><tr class="noPrint"><td width="20%" valign="top" nowrap class="noPrint"></td><td width="80%" valign="top" align="left"><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="comments_section" id="comments_section"><strong>Comments</strong></a></font></td></tr><tr><td><blockquote><p class="notice"><strong>Notice: </strong>This comments section collects your suggestions
+              on improving documentation for Apache Tomcat.<br><br>
+              If you have trouble and need help, read
+              <a href="http://tomcat.apache.org/findhelp.html">Find Help</a> page
+              and ask your question on the tomcat-users
+              <a href="http://tomcat.apache.org/lists.html">mailing list</a>.
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