Author: dblevins
Date: Sun Dec 2 00:12:50 2018
New Revision: 1847931
URL: http://svn.apache.org/viewvc?rev=1847931&view=rev
Log:
Maven update of the website on the Sat Dec 01 16:12:35 PST 2018 from dblevins
Added:
tomee/site/trunk/content/latest/docs/admin/cluster/index.html (with props)
tomee/site/trunk/content/latest/docs/admin/configuration/application.html
(with props)
tomee/site/trunk/content/latest/docs/admin/configuration/containers.html
(with props)
tomee/site/trunk/content/latest/docs/admin/configuration/index.html (with
props)
tomee/site/trunk/content/latest/docs/admin/configuration/resources.html
(with props)
tomee/site/trunk/content/latest/docs/admin/configuration/server.html
(with props)
tomee/site/trunk/content/latest/docs/advanced/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/latest/docs/advanced/client/jndi.html (with
props)
tomee/site/trunk/content/latest/docs/advanced/jms/jms-configuration.html
(with props)
tomee/site/trunk/content/latest/docs/advanced/setup/index.html (with
props)
tomee/site/trunk/content/latest/docs/advanced/shading/index.html (with
props)
tomee/site/trunk/content/latest/docs/advanced/tomee-embedded/index.html
(with props)
tomee/site/trunk/content/latest/docs/contrib/debug/debug-intellij.html
(with props)
tomee/site/trunk/content/latest/docs/developer/classloading/index.html
(with props)
tomee/site/trunk/content/latest/docs/developer/configuration/cxf.html
(with props)
tomee/site/trunk/content/latest/docs/developer/ide/index.html (with props)
tomee/site/trunk/content/latest/docs/developer/json/index.html (with
props)
tomee/site/trunk/content/latest/docs/developer/migration/tomee-1-to-7.html
(with props)
tomee/site/trunk/content/latest/docs/developer/testing/applicationcomposer/
tomee/site/trunk/content/latest/docs/developer/testing/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/latest/docs/developer/testing/arquillian/
tomee/site/trunk/content/latest/docs/developer/testing/arquillian/index.html
(with props)
tomee/site/trunk/content/latest/docs/developer/testing/index.html (with
props)
tomee/site/trunk/content/latest/docs/developer/testing/other/
tomee/site/trunk/content/latest/docs/developer/testing/other/index.html
(with props)
tomee/site/trunk/content/latest/docs/developer/tools/gradle-plugins.html
(with props)
tomee/site/trunk/content/latest/docs/developer/tools/index.html (with
props)
tomee/site/trunk/content/latest/docs/developer/tools/maven/
tomee/site/trunk/content/latest/docs/developer/tools/maven-plugins.html
(with props)
tomee/site/trunk/content/latest/docs/developer/tools/maven/applicationcomposer.html
(with props)
tomee/site/trunk/content/latest/docs/developer/tools/maven/embedded.html
(with props)
tomee/site/trunk/content/latest/docs/developer/tools/maven/tomee.html
(with props)
tomee/site/trunk/content/master/docs/admin/cluster/index.html (with props)
tomee/site/trunk/content/master/docs/admin/configuration/application.html
(with props)
tomee/site/trunk/content/master/docs/admin/configuration/containers.html
(with props)
tomee/site/trunk/content/master/docs/admin/configuration/index.html (with
props)
tomee/site/trunk/content/master/docs/admin/configuration/resources.html
(with props)
tomee/site/trunk/content/master/docs/admin/configuration/server.html
(with props)
tomee/site/trunk/content/master/docs/advanced/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/master/docs/advanced/client/jndi.html (with
props)
tomee/site/trunk/content/master/docs/advanced/jms/jms-configuration.html
(with props)
tomee/site/trunk/content/master/docs/advanced/setup/index.html (with
props)
tomee/site/trunk/content/master/docs/advanced/shading/index.html (with
props)
tomee/site/trunk/content/master/docs/advanced/tomee-embedded/index.html
(with props)
tomee/site/trunk/content/master/docs/contrib/debug/debug-intellij.html
(with props)
tomee/site/trunk/content/master/docs/developer/classloading/index.html
(with props)
tomee/site/trunk/content/master/docs/developer/configuration/cxf.html
(with props)
tomee/site/trunk/content/master/docs/developer/ide/index.html (with props)
tomee/site/trunk/content/master/docs/developer/json/index.html (with
props)
tomee/site/trunk/content/master/docs/developer/migration/tomee-1-to-7.html
(with props)
tomee/site/trunk/content/master/docs/developer/testing/applicationcomposer/
tomee/site/trunk/content/master/docs/developer/testing/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/master/docs/developer/testing/arquillian/
tomee/site/trunk/content/master/docs/developer/testing/arquillian/index.html
(with props)
tomee/site/trunk/content/master/docs/developer/testing/index.html (with
props)
tomee/site/trunk/content/master/docs/developer/testing/other/
tomee/site/trunk/content/master/docs/developer/testing/other/index.html
(with props)
tomee/site/trunk/content/master/docs/developer/tools/gradle-plugins.html
(with props)
tomee/site/trunk/content/master/docs/developer/tools/index.html (with
props)
tomee/site/trunk/content/master/docs/developer/tools/maven/
tomee/site/trunk/content/master/docs/developer/tools/maven-plugins.html
(with props)
tomee/site/trunk/content/master/docs/developer/tools/maven/applicationcomposer.html
(with props)
tomee/site/trunk/content/master/docs/developer/tools/maven/embedded.html
(with props)
tomee/site/trunk/content/master/docs/developer/tools/maven/tomee.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/admin/cluster/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/admin/configuration/application.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/admin/configuration/containers.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/admin/configuration/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/admin/configuration/resources.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/admin/configuration/server.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/client/jndi.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/jms/jms-configuration.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/setup/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/shading/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/advanced/tomee-embedded/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/contrib/debug/debug-intellij.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/classloading/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/configuration/cxf.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/ide/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/developer/json/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/developer/migration/tomee-1-to-7.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/applicationcomposer/
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/applicationcomposer/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/arquillian/
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/arquillian/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/other/
tomee/site/trunk/content/tomee-8.0/docs/developer/testing/other/index.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/gradle-plugins.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/index.html (with
props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/maven/
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/maven-plugins.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/maven/applicationcomposer.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/maven/embedded.html
(with props)
tomee/site/trunk/content/tomee-8.0/docs/developer/tools/maven/tomee.html
(with props)
Added: tomee/site/trunk/content/latest/docs/admin/cluster/index.html
URL:
http://svn.apache.org/viewvc/tomee/site/trunk/content/latest/docs/admin/cluster/index.html?rev=1847931&view=auto
==============================================================================
--- tomee/site/trunk/content/latest/docs/admin/cluster/index.html (added)
+++ tomee/site/trunk/content/latest/docs/admin/cluster/index.html Sun Dec 2
00:12:50 2018
@@ -0,0 +1,551 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+ <meta charset="UTF-8">
+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
+ <meta name="viewport" content="width=device-width, initial-scale=1">
+ <title>Apache TomEE</title>
+ <meta name="description"
+ content="Apache TomEE is a lightweight, yet powerful, JavaEE
Application server with feature rich tooling." />
+ <meta name="keywords"
content="tomee,asf,apache,javaee,jee,shade,embedded,test,junit,applicationcomposer,maven,arquillian"
/>
+ <meta name="author" content="Luka Cvetinovic for Codrops" />
+ <link rel="icon" href="../../../../favicon.ico">
+ <link rel="icon" type="image/png" href="../../../../favicon.png">
+ <meta name="msapplication-TileColor" content="#80287a">
+ <meta name="theme-color" content="#80287a">
+ <link rel="stylesheet" type="text/css"
href="../../../../css/normalize.css">
+ <link rel="stylesheet" type="text/css"
href="../../../../css/bootstrap.css">
+ <link rel="stylesheet" type="text/css" href="../../../../css/owl.css">
+ <link rel="stylesheet" type="text/css"
href="../../../../css/animate.css">
+ <link rel="stylesheet" type="text/css"
href="../../../../fonts/font-awesome-4.1.0/css/font-awesome.min.css">
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href="../../../../fonts/eleganticons/et-icons.css">
+ <link rel="stylesheet" type="text/css"
href="../../../../css/jqtree.css">
+ <link rel="stylesheet" type="text/css" href="../../../../css/idea.css">
+ <link rel="stylesheet" type="text/css"
href="../../../../css/cardio.css">
+
+ <script type="text/javascript">
+
+ var _gaq = _gaq || [];
+ _gaq.push(['_setAccount', 'UA-2717626-1']);
+ _gaq.push(['_setDomainName', 'apache.org']);
+ _gaq.push(['_trackPageview']);
+
+ (function() {
+ var ga = document.createElement('script'); ga.type =
'text/javascript'; ga.async = true;
+ ga.src = ('https:' == document.location.protocol ? 'https://ssl' :
'http://www') + '.google-analytics.com/ga.js';
+ var s = document.getElementsByTagName('script')[0];
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+ })();
+
+ </script>
+</head>
+
+<body>
+ <div class="preloader">
+ <img src="../../../../img/loader.gif" alt="Preloader image">
+ </div>
+ <nav class="navbar">
+ <div class="container">
+ <div class="row"> <div class="col-md-12">
+
+ <!-- Brand and toggle get grouped for better mobile
display -->
+ <div class="navbar-header">
+ <button type="button" class="navbar-toggle
collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
+ <span class="sr-only">Toggle
navigation</span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ </button>
+ <a class="navbar-brand" href="/">
+ <span>
+
+
+ <img src="../../../../img/logo-active.png">
+
+
+ </span>
+ Apache TomEE
+ </a>
+ </div>
+ <!-- Collect the nav links, forms, and other content
for toggling -->
+ <div class="collapse navbar-collapse"
id="bs-example-navbar-collapse-1">
+ <ul class="nav navbar-nav navbar-right
main-nav">
+ <li><a
href="../../../../docs.html">Documentation</a></li>
+ <li><a
href="../../../../community/index.html">Community</a></li>
+ <li><a
href="../../../../security/index.html">Security</a></li>
+ <li><a
href="../../../../download-ng.html">Downloads</a></li>
+ </ul>
+ </div>
+ <!-- /.navbar-collapse -->
+ </div></div>
+ </div>
+ <!-- /.container-fluid -->
+ </nav>
+
+
+ <div id="main-block" class="container section-padded">
+ <div class="row title">
+ <div class="col-md-12">
+ <div class='page-header'>
+
+ <h1>Clustering and High Availability (HA)</h1>
+ </div>
+ </div>
+ </div>
+ <div class="row">
+
+ <div class="col-md-12">
+ <div class="sect2">
+<h3 id="_session_clustering">Session clustering</h3>
+<div class="paragraph">
+<p>TomEE fully relies on Tomcat clustering: <a
href="https://tomcat.apache.org/tomcat-7.0-doc/cluster-howto.html";>Tomcat
Clustering</a>.</p>
+</div>
+<div class="paragraph">
+<p>The configuration is mainly in <code>conf/server.xml</code> and since TomEE
7 CDI <code>@SessionScoped</code> is transparently clustered
+through the session.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_hazelcast_as_session_provider">Hazelcast as session provider</h3>
+<div class="paragraph">
+<p>Hazelcast did a post on this topic on <a
href="https://hazelcast.com/use-cases/web-session-clustering/session-clustering-tomee/";>Session
Clustering With TomEE</a>.</p>
+</div>
+<div class="paragraph">
+<p>Tomitribe also demonstrated you can distributed <code>@Stateful</code>
beans easily relying on hazelcast: <a
href="https://github.com/tomitribe/hazelcast-tomee-poc";>Hazelcast TomEE
PoC</a>.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_load_balancing">Load balancing</h3>
+<div class="paragraph">
+<p>TomEE being a HTTP server all HTTP load balancer such as HTTPd (a.k.a.
Apache2), ngnix, F5 etc…​ will work.</p>
+</div>
+<div class="paragraph">
+<p>More documentation on HTTPd link can be found on <a
href="https://tomcat.apache.org/connectors-doc/webserver_howto/apache.html";>Tomcat</a>
website.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_ejbd">EJBd</h3>
+<div class="paragraph">
+<p>If you use the EJBd protocol (<code>@Remote</code> EJB proprietary protocol
of TomEE) you can get cluster features on the client
+part.</p>
+</div>
+<div class="sect3">
+<h4 id="_multicast">Multicast</h4>
+<div class="paragraph">
+<p>Multicast is the preferred way to broadcast the heartbeat on the network.
The simple technique of broadcasting a non-changing service URI on the network
has specific advantages to multicast. The URI itself is essentially stateless
and there is no "i’m alive" URI or an "i’m dead" URI.</p>
+</div>
+<div class="paragraph">
+<p>In this way the issues with UDP being unordered and unreliable melt away as
state is no longer a concern and packet sizes are always small. Complicated
libraries that ride atop UDP and attempt to offer reliability (retransmission)
and ordering on UDP can be avoided. As well the advantages UDP has over TCP are
retained as there are no java layers attempting to force UDP communication to
be more TCP-like. The simple design means UDP/Multicast is only used for
discovery and from there on out critical information is transmitted over TCP/IP
which is obviously going to do a better job at ensuring reliability and
ordering.</p>
+</div>
+<div class="sect4">
+<h5 id="_server_configuration">Server Configuration</h5>
+<div class="paragraph">
+<p>When you boot the server there should be a conf/multicast.properties file
containing:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-bash" data-lang="bash">server
= org.apache.openejb.server.discovery.MulticastDiscoveryAgent
+bind = 239.255.2.3
+port = 6142
+disabled = true
+group = default</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Just need to enable that by setting disabled=false. All of the above
settings except server can be changed. The port and bind must be valid for
general multicast/udp network communication.</p>
+</div>
+<div class="paragraph">
+<p>The group setting can be changed to further group servers that may use the
same multicast channel. As shown below the client also has a group setting
which can be used to select an appropriate server from the multicast
channel.</p>
+</div>
+<div class="admonitionblock important">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-important" title="Important"></i>
+</td>
+<td class="content">
+for multicast to work you need to have ejbd activated as a normal service.
This can be done setting in <code>conf/system.properties</code> the entry:
<code>openejb.service.manager.class =
org.apache.openejb.server.SimpleServiceManager</code>.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>text</p>
+</div>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-note" title="Note"></i>
+</td>
+<td class="content">
+for multicast to work you need to have ejbd activated as a normal service.
This can be done setting in <code>conf/system.properties</code> the entry:
<code>openejb.service.manager.class =
org.apache.openejb.server.SimpleServiceManager</code>.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>text</p>
+</div>
+<div class="admonitionblock tip">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-tip" title="Tip"></i>
+</td>
+<td class="content">
+for multicast to work you need to have ejbd activated as a normal service.
This can be done setting in <code>conf/system.properties</code> the entry:
<code>openejb.service.manager.class =
org.apache.openejb.server.SimpleServiceManager</code>.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>text</p>
+</div>
+<div class="admonitionblock caution">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-caution" title="Caution"></i>
+</td>
+<td class="content">
+for multicast to work you need to have ejbd activated as a normal service.
This can be done setting in <code>conf/system.properties</code> the entry:
<code>openejb.service.manager.class =
org.apache.openejb.server.SimpleServiceManager</code>.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>text</p>
+</div>
+<div class="admonitionblock warning">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-warning" title="Warning"></i>
+</td>
+<td class="content">
+for multicast to work you need to have ejbd activated as a normal service.
This can be done setting in <code>conf/system.properties</code> the entry:
<code>openejb.service.manager.class =
org.apache.openejb.server.SimpleServiceManager</code>.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>text</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_multicast_client">Multicast Client</h5>
+<div class="paragraph">
+<p>The multicast functionality is not just for servers to find each other in a
cluster, it can also be used for EJB clients to discover a server. A special
multicast:// URL can be used in the InitialContext properties to signify that
multicast should be used to seed the connection process. Such as:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
+"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL, "multicast://239.255.2.3:6142?group=default");
+InitialContext remoteContext = new InitialContext(p);</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>The URL has optional query parameters such as schemes and group and timeout
which allow you to zero in on a particular type of service of a particular
cluster group as well as set how long you are willing to wait in the discovery
process till finally giving up. The first matching service that it sees
"flowing" around on the UDP stream is the one it picks and sticks to for that
and subsequent requests, ensuring UDP is only used when there are no other
servers to talk to.</p>
+</div>
+<div class="paragraph">
+<p>Note that EJB clients do not need to use multicast to find a server. If the
client knows the URL of a server in the cluster, it may use it and connect
directly to that server, at which point that server will share the full list of
its peers.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_multicast_servers_with_tcp_clients">Multicast Servers with TCP
Clients</h5>
+<div class="paragraph">
+<p>Note that clients do not need to use multicast to communicate with servers.
Servers can use multicast to discover each other, but clients are still free to
connect to servers in the network using the server’s TCP address.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL, "ejbd://192.168.1.30:4201");
+InitialContext remoteContext = new InitialContext(p);
+When the client connects, the server will send the URLs of all the servers in
the group and failover will take place normally.</code></pre>
+</div>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_multipulse">Multipulse</h4>
+<div class="paragraph">
+<p>MultiPulse is an alternative multicast lookup that does not use a regular
heartbeat. Instead, servers listen for a multicast request packet (a pulse) to
which a response is then sent. Multicast network traffic is effectively reduced
to an absolute minimum.</p>
+</div>
+<div class="paragraph">
+<p>MultiPulse is only useful in network scenarios where both client and server
can be configured to send multicast UDP packets.</p>
+</div>
+<div class="sect4">
+<h5 id="_server_configuration_2">Server Configuration</h5>
+<div class="paragraph">
+<p>After you boot the server for the first time the default configuration will
create the file conf/conf.d/multipulse.properties containing:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-bash" data-lang="bash">server
= org.apache.openejb.server.discovery.MulticastPulseAgent
+bind = 239.255.2.3
+port = 6142
+disabled = true
+group = default</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>You just need to enable the agent by setting disabled = false. It is
advisable to disable multicast in the multicast.properties file, or at least to
use a different bind address or port should you wish to use both.</p>
+</div>
+<div class="paragraph">
+<p>All of the above settings except server can be modified as required. The
port and bind must be valid for general multicast/udp network communication.</p>
+</div>
+<div class="paragraph">
+<p>The group setting can be changed to further group/cluster servers that may
use the same multicast channel. As shown below the client also has an optional
group setting which can be used to select an appropriate server cluster from
the multicast channel (See MultiPulse Client).</p>
+</div>
+<div class="paragraph">
+<p>The next step is to ensure that the advertised services are configured for
discovery. Edit the ejbd.properties file (and any other enabled services such
as http, etc.) and ensure that the discovery option is set to a value that
remote clients will be able to resolve.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-bash" data-lang="bash">server
= org.apache.openejb.server.ejbd.EjbServer
+bind = 0.0.0.0
+port = 4201
+disabled = false
+threads = 20
+discovery = ejb:ejbd://{bind}:{port}</code></pre>
+</div>
+</div>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-note" title="Note"></i>
+</td>
+<td class="content">
+If either 0.0.0.0 (IPv4) or [::] (IPv6) wildcard bind addresses are used then
the server will actually broadcast all of it’s known public hosts to
clients. Clients will then cycle though and attempt to connect to the provided
hosts until successful.
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>If localhost is used then only clients on the same physical machine will
actually 'see' the server response.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_multipulse_client">MultiPulse Client</h5>
+<div class="paragraph">
+<p>The multipulse functionality is not just for servers to find each other in
a cluster, it can also be used for EJB clients to discover a server. A special
multipulse:// URL can be used in the InitialContext properties to signify that
multipulse should be used to seed the connection process. Such as:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL,
"multipulse://239.255.2.3:6142?group=default&timeout=250");
+InitialContext remoteContext = new InitialContext(p);</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>The URL has optional query parameters such as schemes and group and timeout
which allow you to zero in on a particular type of service of a particular
cluster group as well as set how long you are willing to wait in the discovery
process till finally giving up. The first matching service that it sees
"flowing" around on the UDP stream is the one it picks and sticks to for that
and subsequent requests, ensuring UDP is only used when there are no other
servers to talk to.</p>
+</div>
+<div class="paragraph">
+<p>Note that EJB clients do not need to use multipulse to find a server. If
the client knows the URL of a server in the cluster, it may use it and connect
directly to that server, at which point that server will share the full list of
its peers.</p>
+</div>
+<div class="paragraph">
+<p>Multicast Servers with TCP Clients</p>
+</div>
+<div class="paragraph">
+<p>Note that clients do not need to use multipulse to communicate with
servers. Servers can use multicast to discover each other, but clients are
still free to connect to servers in the network using the server’s TCP
address.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL, "ejbd://192.168.1.30:4201");
+InitialContext remoteContext = new InitialContext(p);</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>When the client connects, the server will send the URLs of all the servers
in the group and failover will take place normally.</p>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_multipoint">Multipoint</h4>
+<div class="paragraph">
+<p>As TCP has no real broadcast functionality to speak of, communication of
who is in the network is achieved by each server having a physical connection
to each other server in the network.</p>
+</div>
+<div class="paragraph">
+<p>To join the network, the server must be configured to know the address of
at least one server in the network and connect to it. When it does both servers
will exchange the full list of all the other servers each knows about. Each
server will then connect to any new servers they’ve just learned about
and repeat the processes with those new servers. The end result is that
everyone has a direct connection to everyone 100% of the time, hence the
made-up term "multipoint" to describe this situation of each server having
multiple point-to-point connections which create a fully connected graph.</p>
+</div>
+<div class="paragraph">
+<p>On the client side things are similar. It needs to know the address of at
least one server in the network and be able to connect to it. When it does it
will get the full (and dynamically maintained) list of every server in the
network. The client doesn’t connect to each of those servers immediately,
but rather consults the list in the event of a failover, using it to decide who
to connect to next.</p>
+</div>
+<div class="paragraph">
+<p>The entire process is essentially the art of using a statically maintained
list to bootstrap getting the more valuable dynamically maintained list.</p>
+</div>
+<div class="sect4">
+<h5 id="_server_configuration_3">Server Configuration</h5>
+<div class="paragraph">
+<p>In the server this list can be specified via the conf/multipoint.properties
file like so:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-bash" data-lang="bash">server
= org.apache.openejb.server.discovery.MultipointDiscoveryAgent
+bind = 127.0.0.1
+port = 4212
+disabled = false
+initialServers = 192.168.1.20:4212, 192.168.1.30:4212,
192.168.1.40:4212</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>The above configuration shows the server has an port 4212 open for
connections by other servers for multipoint communication. The initialServers
list should be a comma separated list of other similar servers on the network.
Only one of the servers listed is required to be running when this server
starts up — it is not required to list all servers in the
network.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_client_configuration">Client Configuration</h5>
+<div class="paragraph">
+<p>Configuration in the client is similar, but note that EJB clients do not
participate directly in multipoint communication and do not connect to the
multipoint port. The server list is simply a list of the regular ejbd:// urls
that a client normally uses to connect to a server.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL,
"failover:ejbd://192.168.1.20:4201,ejbd://192.168.1.30:4201");
+InitialContext remoteContext = new InitialContext(p);</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Failover can work entirely driven by the server, the client does not need
to be configured to participate. A client can connect as usual to the
server.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-java" data-lang="java">Properties
p = new Properties();
+p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
+p.put(Context.PROVIDER_URL, "ejbd://192.168.1.20:4201");
+InitialContext remoteContext = new InitialContext(p);</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>If the server at 192.168.1.20:4201 supports failover, so will the
client.</p>
+</div>
+<div class="paragraph">
+<p>In this scenario the list of servers used for failover is supplied entirely
by the server at 192.168.1.20:4201. The server could have aquired the list via
multicast or multipoint (or both), but this detail is not visible to the
client.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_considerations">Considerations</h5>
+<div class="sect5">
+<h6 id="_network_size">Network size</h6>
+<div class="paragraph">
+<p>The general disadvantage of this topology is the number of connections
required. The number of connections for the network of servers is equal to (n *
n - n) / 2, where n is the number of servers. For example, with 5 servers you
need 10 connections, with 10 servers you need 45 connections, and with 50
servers you need 1225 connections. This is of course the number of connections
across the entire network, each individual server only needs n - 1
connections.</p>
+</div>
+<div class="paragraph">
+<p>The handling of these sockets is all asynchronous Java NIO code which
allows the server to handle many connections (all of them) with one thread.
From a pure threading perspective, the option is extremely efficient with just
one thread to listen and broadcast to many peers.</p>
+</div>
+</div>
+<div class="sect5">
+<h6 id="_double_connect">Double connect</h6>
+<div class="paragraph">
+<p>It is possible in this process that two servers learn of each other at the
same time and each attempts to connect to the other simultaneously, resulting
in two connections between the same two servers. When this happens both servers
will detect the extra connection and one of the connections will be dropped and
one will be kept. In practice this race condition rarely happens and can be
avoided almost entirely by fanning out server startup by as little as 100
milliseconds.</p>
+</div>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_recommandation">Recommandation</h5>
+<div class="paragraph">
+<p>As mentioned the initialServers is only used for bootstrapping the
multipoint network. Once running, all servers will dynamically establish direct
connections with each other and there is no single point of failure.</p>
+</div>
+<div class="paragraph">
+<p>However to ensure that the bootstrapping process can occur successfully,
the initialServers property of the conf/multipoint.properties file must be set
carefully and with a specific server start order in mind. Each server consults
its initialServers list exactly once in the bootstrapping phase at startup,
after that time connections are made dynamically.</p>
+</div>
+<div class="paragraph">
+<p>This means that at least one of the servers listed in initialServers must
already be running when the server starts or the server might never become
introduced and connected to all the other servers in the network.</p>
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+ <h1>Application Configuration</h1>
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+
+ <div class="col-md-12">
+ <div class="sect2">
+<h3
id="__code_application_properties_code"><code>application.properties</code></h3>
+<div class="paragraph">
+<p>This file is located in <code>WEB-INF</code> for a war and
<code>META-INF</code> for an ear.</p>
+</div>
+<div class="sect3">
+<h4 id="__code_asynchronous_code_configuration"><code>@Asynchronous</code>
configuration</h4>
+<div class="paragraph">
+<p>Default pool size for <code>@Asynchronous</code> is 5. It can be very small
for some applications highly relying on
+asynchronism or reactive patterns. Therefore it is possible to customize it
adding these entries in <code>application.properties</code>:</p>
+</div>
+<table class="tableblock frame-all grid-all spread table table-bordered">
+<colgroup>
+<col style="width: 33.3333%;">
+<col style="width: 33.3333%;">
+<col style="width: 33.3334%;">
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Default</th>
+<th class="tableblock halign-left valign-top">Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.Size</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">5</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Core size
of the pool</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.CorePoolSize</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">5</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Core size
of the pool (inherit its default from .Size alias)</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.MaximumPoolSize</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">5</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Maximum
size of the pool</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.QueueSize</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">5</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Maximum
size of the pool</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.KeepAliveTime</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">1
minute</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Thread
keep alive duration</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.AllowCoreThreadTimeOut</p></td>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Should
thread timeout</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.QueueType</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">LINKED (or
SYNCHRONOUS if size == 0)</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">The type
of queue of the pool in ARRAY, LINKED, PRIORITY or SYNCHRONOUS (same behavior
as java implementations of the same name)</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.ShutdownWaitDuration</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">1
minute</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">How many
time to wait for the pool to shutdown when undeploying the application</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AsynchronousPool.RejectedExecutionHandlerClass</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A fully
qualified name of a
<code>java.util.concurrent.RejectedExecutionHandler</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect3">
+<h4 id="_timerservice_and_code_scheduled_code">TimerService and
<code>@Scheduled</code></h4>
+<div class="paragraph">
+<p><code>timerStore.class</code> allows to switch from the in memory
(<code>org.apache.openejb.core.timer.MemoryTimerStore</code>) timer storage
+for quartz tasks to a custom implementation (using a database or anything for
instance). Constructor can take a <code>TransactionManager</code>
+or nothing.</p>
+</div>
+<div class="paragraph">
+<p>All quartz properties prefixed with <code>org.apache.openejb.quartz.</code>
(instead of <code>org.quartz.</code>) are passthrough to quartz.</p>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_cdi">CDI</h4>
+<div class="paragraph">
+<p>The boolean <code>openejb.cdi.skip-resource-validation</code> allows to not
validate resources ie <code>@EJB</code> and <code>@Resource</code> usages in
CDI beans.</p>
+</div>
+<div class="paragraph">
+<p>All properties understood by OpenWebBeans will also be passthrough to
OpenWebBeans from this location, see <a
href="http://openwebbeans.apache.org/owbconfig.html";>OWB config</a> for more
details.</p>
+</div>
+</div>
+<div class="sect3">
+<h4 id="__code_webserviceref_code"><code>@WebServiceRef</code></h4>
+<table class="tableblock frame-all grid-all spread table table-bordered">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">cxf.jaxws.client.wsFeatures</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Allows to
set WSFeature on the client injection. Values is a list (comma separated) of
resource id in resources.xml or fully qualified names.</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect3">
+<h4 id="__code_stateless_code"><code>@Stateless</code></h4>
+<table class="tableblock frame-all grid-all spread table table-bordered">
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">AccessTimeout or Timeout</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">container
timeout</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">CloseTimeout</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">container
timeout</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">BackgroundStartup</p></td>
+<td class="tableblock halign-left valign-top"><p
class="tableblock">Don’t create instances in parallel if minimum count is
> 0, default to false</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+<div class="sect2">
+<h3 id="__code_resources_xml_code"><code>resources.xml</code></h3>
+<div class="paragraph">
+<p><code>resources.xml</code> is a tomee.xml using application classloader.</p>
+</div>
+<div class="paragraph">
+<p>As <code>tomee.xml</code> it supports filtering so you can use environment
variables and system properties, for instance
+to use a MySQL database on OpenShift you can do:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-xml" data-lang="xml"><?xml
version="1.0" encoding="UTF-8"?>
+<resources>
+ <Resource id="MySQL" aliases="myAppDataSourceName" type="DataSource">
+ JdbcDriver = com.mysql.jdbc.Driver
+ JdbcUrl =
jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/rmannibucau?tcpKeepAlive=true
+ UserName = ${OPENSHIFT_MYSQL_DB_USERNAME}
+ Password = ${OPENSHIFT_MYSQL_DB_PASSWORD}
+ ValidationQuery = SELECT 1
+ ValidationInterval = 30000
+ NumTestsPerEvictionRun = 5
+ TimeBetweenEvictionRuns = 30 seconds
+ TestWhileIdle = true
+ MaxActive = 200
+ </Resource>
+</resources></code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p><code>resources.xml</code> supports <code>Resource</code>,
<code>Service</code> and <code>Container</code>.</p>
+</div>
+<div class="sect3">
+<h4 id="__code_resources_xml_code_mecanism"><code>resources.xml</code>
mecanism</h4>
+<div class="paragraph">
+<p><code>resources.xml</code> resources are still available globally like any
<code>tomee.xml</code> resource.</p>
+</div>
+<div class="paragraph">
+<p>The actual resource is bound in an application subtree called with the
application name and a resource facade is bound
+in the global naming tree to be able to route the requests depending the
application.</p>
+</div>
+<div class="paragraph">
+<p>Typically if your application is named <code>myapp</code> and your resource
id is <code>myresource</code> then instead of being registered
+as <code>myresource</code>, it will get registered as
<code>myapp/myresource</code>.</p>
+</div>
+<div class="paragraph">
+<p>If you get any ambiguity in resource name matching try to fully qualified
your resource prefixing it with the application name.</p>
+</div>
+</div>
+</div>
+ </div>
+
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