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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title></title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-install.html" title="1.&nbsp;Install Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-install.html">Next</a></td></tr></table><hr></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>This project provides Zookeeper integrations for Spring Boot applications through
<title></title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-install.html" title="1.&nbsp;Install Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-install.html">Next</a></td></tr></table><hr></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>This project provides Zookeeper integrations for Spring Boot applications through
autoconfiguration and binding to the Spring Environment and other Spring programming model
idioms. With a few annotations, you can quickly enable and configure the common patterns
inside your application and build large distributed systems with Zookeeper based

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>7.&nbsp;Distributed Configuration with Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-dependency-watcher.html" title="6.&nbsp;Spring Cloud Zookeeper Dependency Watcher"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">7.&nbsp;Distributed Configuration with Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-dependency-watcher.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;</td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-config" href="#spring-cloud-zookeeper-config"></a>7.&nbsp;Distributed Configuration with Zookeeper</h1></div></div></div><p>Zookeeper provides a
<title>7.&nbsp;Distributed Configuration with Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-dependency-watcher.html" title="6.&nbsp;Spring Cloud Zookeeper Dependency Watcher"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">7.&nbsp;Distributed Configuration with Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-dependency-watcher.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;</td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-config" href="#spring-cloud-zookeeper-config"></a>7.&nbsp;Distributed Configuration with Zookeeper</h1></div></div></div><p>Zookeeper provides a
<a class="link" href="http://zookeeper.apache.org/doc/current/zookeeperOver.html#sc_dataModelNameSpace" target="_top">hierarchical namespace</a>
that lets clients store arbitrary data, such as configuration data. Spring Cloud Zookeeper
Config is an alternative to the
<a class="link" href="https://github.com/spring-cloud/spring-cloud-config" target="_top">Config Server and Client</a>.
Configuration is loaded into the Spring Environment during the special &#8220;bootstrap&#8221;
Configuration is loaded into the Spring Environment during the special <span class="quote">&#8220;<span class="quote">bootstrap</span>&#8221;</span>
phase. Configuration is stored in the <code class="literal">/config</code> namespace by default. Multiple
<code class="literal">PropertySource</code> instances are created, based on the application&#8217;s name and the active
profiles, to mimic the Spring Cloud Config order of resolving properties. For example, an

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>5.&nbsp;Zookeeper Dependencies</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-service-registry.html" title="4.&nbsp;Spring Cloud Zookeeper and Service Registry"><link rel="next" href="multi_spring-cloud-zookeeper-dependency-watcher.html" title="6.&nbsp;Spring Cloud Zookeeper Dependency Watcher"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;Zookeeper Dependencies</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-service-registry.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-dependency-watcher.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-dependencies" href="#spring-cloud-zookeeper-dependencies"></a>5.&nbsp;Zookeeper Dependencies</h1></div></div></div><p>The following topics cover how to work with Spring Cloud Zookeeper dependencies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-using" title="5.1&nbsp;Using the Zookeeper Dependencies">Section&nbsp;5.1, &#8220;Using the Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-activating" title="5.2&nbsp;Activating Zookeeper Dependencies">Section&nbsp;5.2, &#8220;Activating Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-setting-up" title="5.3&nbsp;Setting up Zookeeper Dependencies">Section&nbsp;5.3, &#8220;Setting up Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-configuring" title="5.4&nbsp;Configuring Spring Cloud Zookeeper Dependencies">Section&nbsp;5.4, &#8220;Configuring Spring Cloud Zookeeper Dependencies&#8221;</a></li></ul></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="spring-cloud-zookeeper-dependencies-using" href="#spring-cloud-zookeeper-dependencies-using"></a>5.1&nbsp;Using the Zookeeper Dependencies</h2></div></div></div><p>Spring Cloud Zookeeper gives you a possibility to provide dependencies of your application
<title>5.&nbsp;Zookeeper Dependencies</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-service-registry.html" title="4.&nbsp;Spring Cloud Zookeeper and Service Registry"><link rel="next" href="multi_spring-cloud-zookeeper-dependency-watcher.html" title="6.&nbsp;Spring Cloud Zookeeper Dependency Watcher"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;Zookeeper Dependencies</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-service-registry.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-dependency-watcher.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-dependencies" href="#spring-cloud-zookeeper-dependencies"></a>5.&nbsp;Zookeeper Dependencies</h1></div></div></div><p>The following topics cover how to work with Spring Cloud Zookeeper dependencies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-using" title="5.1&nbsp;Using the Zookeeper Dependencies">Section&nbsp;5.1, &#8220;Using the Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-activating" title="5.2&nbsp;Activating Zookeeper Dependencies">Section&nbsp;5.2, &#8220;Activating Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-setting-up" title="5.3&nbsp;Setting up Zookeeper Dependencies">Section&nbsp;5.3, &#8220;Setting up Zookeeper Dependencies&#8221;</a></li><li class="listitem"><a class="xref" href="multi_spring-cloud-zookeeper-dependencies.html#spring-cloud-zookeeper-dependencies-configuring" title="5.4&nbsp;Configuring Spring Cloud Zookeeper Dependencies">Section&nbsp;5.4, &#8220;Configuring Spring Cloud Zookeeper Dependencies&#8221;</a></li></ul></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="spring-cloud-zookeeper-dependencies-using" href="#spring-cloud-zookeeper-dependencies-using"></a>5.1&nbsp;Using the Zookeeper Dependencies</h2></div></div></div><p>Spring Cloud Zookeeper gives you a possibility to provide dependencies of your application
as properties. As dependencies, you can understand other applications that are registered
in Zookeeper and which you would like to call through
<a class="link" href="https://github.com/spring-cloud/spring-cloud-netflix/blob/master/docs/src/main/asciidoc/spring-cloud-netflix.adoc#spring-cloud-feign" target="_top">Feign</a>
@@ -47,7 +47,7 @@ dependency is registered under Zookeeper. As described in the
operates on URLs. As a result, this path is not compliant with its requirement.
That is why Spring Cloud Zookeeper maps the alias to the proper path.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_load_balancer_type" href="#_load_balancer_type"></a>5.3.3&nbsp;Load Balancer Type</h3></div></div></div><p>The load balancer type is represented by <code class="literal">loadBalancerType</code> YAML property.</p><p>If you know what kind of load-balancing strategy has to be applied when calling this
particular dependency, you can provide it in the YAML file, and it is automatically
applied. You can choose one of the following load balancing strategies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">STICKY: Once chosen, the instance is always called.</li><li class="listitem">RANDOM: Picks an instance randomly.</li><li class="listitem">ROUND_ROBIN: Iterates over instances over and over again.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="__literal_content_type_literal_template_and_version" href="#__literal_content_type_literal_template_and_version"></a>5.3.4&nbsp;<code class="literal">Content-Type</code> Template and Version</h3></div></div></div><p>The <code class="literal">Content-Type</code> template and version are represented by the <code class="literal">contentTypeTemplate</code> and
applied. You can choose one of the following load balancing strategies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">STICKY: Once chosen, the instance is always called.</li><li class="listitem">RANDOM: Picks an instance randomly.</li><li class="listitem">ROUND_ROBIN: Iterates over instances over and over again.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_content_type_template_and_version" href="#_content_type_template_and_version"></a>5.3.4&nbsp;<code class="literal">Content-Type</code> Template and Version</h3></div></div></div><p>The <code class="literal">Content-Type</code> template and version are represented by the <code class="literal">contentTypeTemplate</code> and
<code class="literal">version</code> YAML properties.</p><p>If you version your API in the <code class="literal">Content-Type</code> header, you do not want to add this header
to each of your requests. Also, if you want to call a new version of the API, you do not
want to roam around your code to bump up the API version. That is why you can provide a

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<title>6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-dependencies.html" title="5.&nbsp;Zookeeper Dependencies"><link rel="next" href="multi_spring-cloud-zookeeper-config.html" title="7.&nbsp;Distributed Configuration with Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-dependencies.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-config.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-dependency-watcher" href="#spring-cloud-zookeeper-dependency-watcher"></a>6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</h1></div></div></div><p>The Dependency Watcher mechanism lets you register listeners to your dependencies. The
<title>6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-dependencies.html" title="5.&nbsp;Zookeeper Dependencies"><link rel="next" href="multi_spring-cloud-zookeeper-config.html" title="7.&nbsp;Distributed Configuration with Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-dependencies.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-config.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-dependency-watcher" href="#spring-cloud-zookeeper-dependency-watcher"></a>6.&nbsp;Spring Cloud Zookeeper Dependency Watcher</h1></div></div></div><p>The Dependency Watcher mechanism lets you register listeners to your dependencies. The
functionality is, in fact, an implementation of the <code class="literal">Observator</code> pattern. When a
dependency changes, its state (to either UP or DOWN), some custom logic can be applied.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_activating_2" href="#_activating_2"></a>6.1&nbsp;Activating</h2></div></div></div><p>Spring Cloud Zookeeper Dependencies functionality needs to be enabled for you to use the
Dependency Watcher mechanism.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_registering_a_listener" href="#_registering_a_listener"></a>6.2&nbsp;Registering a Listener</h2></div></div></div><p>To register a listener, you must implement an interface called

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>2.&nbsp;Service Discovery with Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-install.html" title="1.&nbsp;Install Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-netflix.html" title="3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Service Discovery with Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-install.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-netflix.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-discovery" href="#spring-cloud-zookeeper-discovery"></a>2.&nbsp;Service Discovery with Zookeeper</h1></div></div></div><p>Service Discovery is one of the key tenets of a microservice based architecture. Trying to
<title>2.&nbsp;Service Discovery with Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-install.html" title="1.&nbsp;Install Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-netflix.html" title="3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.&nbsp;Service Discovery with Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-install.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-netflix.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-discovery" href="#spring-cloud-zookeeper-discovery"></a>2.&nbsp;Service Discovery with Zookeeper</h1></div></div></div><p>Service Discovery is one of the key tenets of a microservice based architecture. Trying to
hand-configure each client or some form of convention can be difficult to do and can be
brittle. <a class="link" href="http://curator.apache.org" target="_top">Curator</a>(A Java library for Zookeeper) provides Service
Discovery through a <a class="link" href="http://curator.apache.org/curator-x-discovery/" target="_top">Service Discovery
@@ -33,7 +33,7 @@ provide the location of the server, as shown in the following example:</p><p><b>
values shown in the preceding example need to be in <code class="literal">bootstrap.yml</code> instead of
<code class="literal">application.yml</code>.</p></td></tr></table></div><p>The default service name, instance ID, and port (taken from the <code class="literal">Environment</code>) are
<code class="literal">${spring.application.name}</code>, the Spring Context ID, and <code class="literal">${server.port}</code>, respectively.</p><p>Having <code class="literal">spring-cloud-starter-zookeeper-discovery</code> on the classpath makes the app into both
a Zookeeper &#8220;service&#8221; (that is, it registers itself) and a &#8220;client&#8221; (that is, it can
a Zookeeper <span class="quote">&#8220;<span class="quote">service</span>&#8221;</span> (that is, it registers itself) and a <span class="quote">&#8220;<span class="quote">client</span>&#8221;</span> (that is, it can
query Zookeeper to locate other services).</p><p>If you would like to disable the Zookeeper Discovery Client, you can set
<code class="literal">spring.cloud.zookeeper.discovery.enabled</code> to <code class="literal">false</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_using_the_discoveryclient" href="#_using_the_discoveryclient"></a>2.3&nbsp;Using the DiscoveryClient</h2></div></div></div><p>Spring Cloud has support for
<a class="link" href="https://github.com/spring-cloud/spring-cloud-netflix/blob/master/docs/src/main/asciidoc/spring-cloud-netflix.adoc#spring-cloud-feign" target="_top">Feign</a>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>1.&nbsp;Install Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi_spring-cloud-zookeeper-discovery.html" title="2.&nbsp;Service Discovery with Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.&nbsp;Install Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-discovery.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-install" href="#spring-cloud-zookeeper-install"></a>1.&nbsp;Install Zookeeper</h1></div></div></div><p>See the <a class="link" href="http://zookeeper.apache.org/doc/current/zookeeperStarted.html" target="_top">installation
<title>1.&nbsp;Install Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi_spring-cloud-zookeeper-discovery.html" title="2.&nbsp;Service Discovery with Zookeeper"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.&nbsp;Install Zookeeper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-discovery.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-install" href="#spring-cloud-zookeeper-install"></a>1.&nbsp;Install Zookeeper</h1></div></div></div><p>See the <a class="link" href="http://zookeeper.apache.org/doc/current/zookeeperStarted.html" target="_top">installation
documentation</a> for instructions on how to install Zookeeper.</p><p>Spring Cloud Zookeeper uses Apache Curator behind the scenes.
While Zookeeper 3.5.x is still considered "beta" by the Zookeeper development team,
the reality is that it is used in production by many users.

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-discovery.html" title="2.&nbsp;Service Discovery with Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-service-registry.html" title="4.&nbsp;Spring Cloud Zookeeper and Service Registry"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-discovery.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-service-registry.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-netflix" href="#spring-cloud-zookeeper-netflix"></a>3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</h1></div></div></div><p>Spring Cloud Netflix supplies useful tools that work regardless of which <code class="literal">DiscoveryClient</code>
<title>3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-discovery.html" title="2.&nbsp;Service Discovery with Zookeeper"><link rel="next" href="multi_spring-cloud-zookeeper-service-registry.html" title="4.&nbsp;Spring Cloud Zookeeper and Service Registry"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-discovery.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-service-registry.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-netflix" href="#spring-cloud-zookeeper-netflix"></a>3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</h1></div></div></div><p>Spring Cloud Netflix supplies useful tools that work regardless of which <code class="literal">DiscoveryClient</code>
implementation you use. Feign, Turbine, Ribbon, and Zuul all work with Spring Cloud
Zookeeper.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_ribbon_with_zookeeper" href="#_ribbon_with_zookeeper"></a>3.1&nbsp;Ribbon with Zookeeper</h2></div></div></div><p>Spring Cloud Zookeeper provides an implementation of Ribbon&#8217;s <code class="literal">ServerList</code>. When you use
the <code class="literal">spring-cloud-starter-zookeeper-discovery</code>, Ribbon is autoconfigured to use the

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>4.&nbsp;Spring Cloud Zookeeper and Service Registry</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-netflix.html" title="3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components"><link rel="next" href="multi_spring-cloud-zookeeper-dependencies.html" title="5.&nbsp;Zookeeper Dependencies"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.&nbsp;Spring Cloud Zookeeper and Service Registry</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-netflix.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-dependencies.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-service-registry" href="#spring-cloud-zookeeper-service-registry"></a>4.&nbsp;Spring Cloud Zookeeper and Service Registry</h1></div></div></div><p>Spring Cloud Zookeeper implements the <code class="literal">ServiceRegistry</code> interface, letting developers
<title>4.&nbsp;Spring Cloud Zookeeper and Service Registry</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="up" href="multi_spring-cloud-zookeeper.html" title="Spring Cloud Zookeeper"><link rel="prev" href="multi_spring-cloud-zookeeper-netflix.html" title="3.&nbsp;Using Spring Cloud Zookeeper with Spring Cloud Netflix Components"><link rel="next" href="multi_spring-cloud-zookeeper-dependencies.html" title="5.&nbsp;Zookeeper Dependencies"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.&nbsp;Spring Cloud Zookeeper and Service Registry</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-zookeeper-netflix.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi_spring-cloud-zookeeper-dependencies.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-zookeeper-service-registry" href="#spring-cloud-zookeeper-service-registry"></a>4.&nbsp;Spring Cloud Zookeeper and Service Registry</h1></div></div></div><p>Spring Cloud Zookeeper implements the <code class="literal">ServiceRegistry</code> interface, letting developers
register arbitrary services in a programmatic way.</p><p>The <code class="literal">ServiceInstanceRegistration</code> class offers a <code class="literal">builder()</code> method to create a
<code class="literal">Registration</code> object that can be used by the <code class="literal">ServiceRegistry</code>, as shown in the following
example:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Autowired</span></em>

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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring Cloud Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-singlepage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div lang="en" class="book"><div class="titlepage"><div><div><h1 class="title"><a name="d0e3"></a>Spring Cloud Zookeeper</h1></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="preface"><a href="#d0e9"></a></span></dt><dt><span class="chapter"><a href="#spring-cloud-zookeeper-install">1. Install Zookeeper</a></span></dt><dt><span class="chapter"><a href="#spring-cloud-zookeeper-discovery">2. Service Discovery with Zookeeper</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating">2.1. Activating</a></span></dt><dt><span class="section"><a href="#_registering_with_zookeeper">2.2. Registering with Zookeeper</a></span></dt><dt><span class="section"><a href="#_using_the_discoveryclient">2.3. Using the DiscoveryClient</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-netflix">3. Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</a></span></dt><dd><dl><dt><span class="section"><a href="#_ribbon_with_zookeeper">3.1. Ribbon with Zookeeper</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-service-registry">4. Spring Cloud Zookeeper and Service Registry</a></span></dt><dd><dl><dt><span class="section"><a href="#_instance_status">4.1. Instance Status</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-dependencies">5. Zookeeper Dependencies</a></span></dt><dd><dl><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-using">5.1. Using the Zookeeper Dependencies</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-activating">5.2. Activating Zookeeper Dependencies</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-setting-up">5.3. Setting up Zookeeper Dependencies</a></span></dt><dd><dl><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-setting-up-aliases">5.3.1. Aliases</a></span></dt><dt><span class="section"><a href="#_path">5.3.2. Path</a></span></dt><dt><span class="section"><a href="#_load_balancer_type">5.3.3. Load Balancer Type</a></span></dt><dt><span class="section"><a href="#__literal_content_type_literal_template_and_version">5.3.4. <code class="literal">Content-Type</code> Template and Version</a></span></dt><dt><span class="section"><a href="#_default_headers">5.3.5. Default Headers</a></span></dt><dt><span class="section"><a href="#_required_dependencies">5.3.6. Required Dependencies</a></span></dt><dt><span class="section"><a href="#_stubs">5.3.7. Stubs</a></span></dt></dl></dd><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-configuring">5.4. Configuring Spring Cloud Zookeeper Dependencies</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-dependency-watcher">6. Spring Cloud Zookeeper Dependency Watcher</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating_2">6.1. Activating</a></span></dt><dt><span class="section"><a href="#_registering_a_listener">6.2. Registering a Listener</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependency-watcher-presence-checker">6.3. Using the Presence Checker</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-config">7. Distributed Configuration with Zookeeper</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating_3">7.1. Activating</a></span></dt><dt><span class="section"><a href="#_customizing">7.2. Customizing</a></span></dt><dt><span class="section"><a href="#_access_control_lists_acls">7.3. Access Control Lists (ACLs)</a></span></dt></dl></dd></dl></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>This project provides Zookeeper integrations for Spring Boot applications through
<title>Spring Cloud Zookeeper</title><link rel="stylesheet" type="text/css" href="css/manual-singlepage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div lang="en" class="book"><div class="titlepage"><div><div><h1 class="title"><a name="d0e3"></a>Spring Cloud Zookeeper</h1></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="preface"><a href="#d0e9"></a></span></dt><dt><span class="chapter"><a href="#spring-cloud-zookeeper-install">1. Install Zookeeper</a></span></dt><dt><span class="chapter"><a href="#spring-cloud-zookeeper-discovery">2. Service Discovery with Zookeeper</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating">2.1. Activating</a></span></dt><dt><span class="section"><a href="#_registering_with_zookeeper">2.2. Registering with Zookeeper</a></span></dt><dt><span class="section"><a href="#_using_the_discoveryclient">2.3. Using the DiscoveryClient</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-netflix">3. Using Spring Cloud Zookeeper with Spring Cloud Netflix Components</a></span></dt><dd><dl><dt><span class="section"><a href="#_ribbon_with_zookeeper">3.1. Ribbon with Zookeeper</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-service-registry">4. Spring Cloud Zookeeper and Service Registry</a></span></dt><dd><dl><dt><span class="section"><a href="#_instance_status">4.1. Instance Status</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-dependencies">5. Zookeeper Dependencies</a></span></dt><dd><dl><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-using">5.1. Using the Zookeeper Dependencies</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-activating">5.2. Activating Zookeeper Dependencies</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-setting-up">5.3. Setting up Zookeeper Dependencies</a></span></dt><dd><dl><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-setting-up-aliases">5.3.1. Aliases</a></span></dt><dt><span class="section"><a href="#_path">5.3.2. Path</a></span></dt><dt><span class="section"><a href="#_load_balancer_type">5.3.3. Load Balancer Type</a></span></dt><dt><span class="section"><a href="#_content_type_template_and_version">5.3.4. <code class="literal">Content-Type</code> Template and Version</a></span></dt><dt><span class="section"><a href="#_default_headers">5.3.5. Default Headers</a></span></dt><dt><span class="section"><a href="#_required_dependencies">5.3.6. Required Dependencies</a></span></dt><dt><span class="section"><a href="#_stubs">5.3.7. Stubs</a></span></dt></dl></dd><dt><span class="section"><a href="#spring-cloud-zookeeper-dependencies-configuring">5.4. Configuring Spring Cloud Zookeeper Dependencies</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-dependency-watcher">6. Spring Cloud Zookeeper Dependency Watcher</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating_2">6.1. Activating</a></span></dt><dt><span class="section"><a href="#_registering_a_listener">6.2. Registering a Listener</a></span></dt><dt><span class="section"><a href="#spring-cloud-zookeeper-dependency-watcher-presence-checker">6.3. Using the Presence Checker</a></span></dt></dl></dd><dt><span class="chapter"><a href="#spring-cloud-zookeeper-config">7. Distributed Configuration with Zookeeper</a></span></dt><dd><dl><dt><span class="section"><a href="#_activating_3">7.1. Activating</a></span></dt><dt><span class="section"><a href="#_customizing">7.2. Customizing</a></span></dt><dt><span class="section"><a href="#_access_control_lists_acls">7.3. Access Control Lists (ACLs)</a></span></dt></dl></dd></dl></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a name="d0e9" href="#d0e9"></a></h1></div></div></div><p>This project provides Zookeeper integrations for Spring Boot applications through
autoconfiguration and binding to the Spring Environment and other Spring programming model
idioms. With a few annotations, you can quickly enable and configure the common patterns
inside your application and build large distributed systems with Zookeeper based
@@ -76,7 +76,7 @@ provide the location of the server, as shown in the following example:</p><p><b>
values shown in the preceding example need to be in <code class="literal">bootstrap.yml</code> instead of
<code class="literal">application.yml</code>.</p></td></tr></table></div><p>The default service name, instance ID, and port (taken from the <code class="literal">Environment</code>) are
<code class="literal">${spring.application.name}</code>, the Spring Context ID, and <code class="literal">${server.port}</code>, respectively.</p><p>Having <code class="literal">spring-cloud-starter-zookeeper-discovery</code> on the classpath makes the app into both
a Zookeeper &#8220;service&#8221; (that is, it registers itself) and a &#8220;client&#8221; (that is, it can
a Zookeeper <span class="quote">&#8220;<span class="quote">service</span>&#8221;</span> (that is, it registers itself) and a <span class="quote">&#8220;<span class="quote">client</span>&#8221;</span> (that is, it can
query Zookeeper to locate other services).</p><p>If you would like to disable the Zookeeper Discovery Client, you can set
<code class="literal">spring.cloud.zookeeper.discovery.enabled</code> to <code class="literal">false</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_using_the_discoveryclient" href="#_using_the_discoveryclient"></a>2.3&nbsp;Using the DiscoveryClient</h2></div></div></div><p>Spring Cloud has support for
<a class="link" href="https://github.com/spring-cloud/spring-cloud-netflix/blob/master/docs/src/main/asciidoc/spring-cloud-netflix.adoc#spring-cloud-feign" target="_top">Feign</a>
@@ -167,7 +167,7 @@ dependency is registered under Zookeeper. As described in the
operates on URLs. As a result, this path is not compliant with its requirement.
That is why Spring Cloud Zookeeper maps the alias to the proper path.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_load_balancer_type" href="#_load_balancer_type"></a>5.3.3&nbsp;Load Balancer Type</h3></div></div></div><p>The load balancer type is represented by <code class="literal">loadBalancerType</code> YAML property.</p><p>If you know what kind of load-balancing strategy has to be applied when calling this
particular dependency, you can provide it in the YAML file, and it is automatically
applied. You can choose one of the following load balancing strategies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">STICKY: Once chosen, the instance is always called.</li><li class="listitem">RANDOM: Picks an instance randomly.</li><li class="listitem">ROUND_ROBIN: Iterates over instances over and over again.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="__literal_content_type_literal_template_and_version" href="#__literal_content_type_literal_template_and_version"></a>5.3.4&nbsp;<code class="literal">Content-Type</code> Template and Version</h3></div></div></div><p>The <code class="literal">Content-Type</code> template and version are represented by the <code class="literal">contentTypeTemplate</code> and
applied. You can choose one of the following load balancing strategies:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">STICKY: Once chosen, the instance is always called.</li><li class="listitem">RANDOM: Picks an instance randomly.</li><li class="listitem">ROUND_ROBIN: Iterates over instances over and over again.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_content_type_template_and_version" href="#_content_type_template_and_version"></a>5.3.4&nbsp;<code class="literal">Content-Type</code> Template and Version</h3></div></div></div><p>The <code class="literal">Content-Type</code> template and version are represented by the <code class="literal">contentTypeTemplate</code> and
<code class="literal">version</code> YAML properties.</p><p>If you version your API in the <code class="literal">Content-Type</code> header, you do not want to add this header
to each of your requests. Also, if you want to call a new version of the API, you do not
want to roam around your code to bump up the API version. That is why you can provide a
@@ -226,7 +226,7 @@ overridden.</p></div></div><div class="chapter"><div class="titlepage"><div><div
that lets clients store arbitrary data, such as configuration data. Spring Cloud Zookeeper
Config is an alternative to the
<a class="link" href="https://github.com/spring-cloud/spring-cloud-config" target="_top">Config Server and Client</a>.
Configuration is loaded into the Spring Environment during the special &#8220;bootstrap&#8221;
Configuration is loaded into the Spring Environment during the special <span class="quote">&#8220;<span class="quote">bootstrap</span>&#8221;</span>
phase. Configuration is stored in the <code class="literal">/config</code> namespace by default. Multiple
<code class="literal">PropertySource</code> instances are created, based on the application&#8217;s name and the active
profiles, to mimic the Spring Cloud Config order of resolving properties. For example, an

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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.5">
<meta name="generator" content="Asciidoctor 1.5.7.1">
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<book xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en">
<info>
<title>Spring Cloud Zookeeper</title>
<date>2018-09-29</date>
<date>2018-10-01</date>
</info>
<preface>
<title></title>
@@ -130,7 +130,7 @@ values shown in the preceding example need to be in <literal>bootstrap.yml</lite
<simpara>The default service name, instance ID, and port (taken from the <literal>Environment</literal>) are
<literal>${spring.application.name}</literal>, the Spring Context ID, and <literal>${server.port}</literal>, respectively.</simpara>
<simpara>Having <literal>spring-cloud-starter-zookeeper-discovery</literal> on the classpath makes the app into both
a Zookeeper &#8220;service&#8221; (that is, it registers itself) and a &#8220;client&#8221; (that is, it can
a Zookeeper <quote>service</quote> (that is, it registers itself) and a <quote>client</quote> (that is, it can
query Zookeeper to locate other services).</simpara>
<simpara>If you would like to disable the Zookeeper Discovery Client, you can set
<literal>spring.cloud.zookeeper.discovery.enabled</literal> to <literal>false</literal>.</simpara>
@@ -313,7 +313,7 @@ applied. You can choose one of the following load balancing strategies:</simpara
</listitem>
</itemizedlist>
</section>
<section xml:id="__literal_content_type_literal_template_and_version">
<section xml:id="_content_type_template_and_version">
<title><literal>Content-Type</literal> Template and Version</title>
<simpara>The <literal>Content-Type</literal> template and version are represented by the <literal>contentTypeTemplate</literal> and
<literal>version</literal> YAML properties.</simpara>
@@ -468,7 +468,7 @@ overridden.</simpara>
that lets clients store arbitrary data, such as configuration data. Spring Cloud Zookeeper
Config is an alternative to the
<link xl:href="https://github.com/spring-cloud/spring-cloud-config">Config Server and Client</link>.
Configuration is loaded into the Spring Environment during the special &#8220;bootstrap&#8221;
Configuration is loaded into the Spring Environment during the special <quote>bootstrap</quote>
phase. Configuration is stored in the <literal>/config</literal> namespace by default. Multiple
<literal>PropertySource</literal> instances are created, based on the application&#8217;s name and the active
profiles, to mimic the Spring Cloud Config order of resolving properties. For example, an