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| class='' |
| >Troubleshooting and Debugging</a> |
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| class='' |
| >Handling Exceptions</a> |
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| >Benchmarking With Yardstick</a> |
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| <div class="left-nav__overlay"></div> |
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| |
| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/quick-start/java.adoc" target="_blank">Edit</a> |
| |
| <h1>Ignite for Java</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This page explains system requirements for running Ignite, how to install Ignite, start a cluster and run a simple Hello World example.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="prerequisites">Prerequisites</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite was officially tested on:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stripes-even stretch"> |
| <colgroup> |
| <col style="width: 25%;"> |
| <col style="width: 75%;"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDK</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Oracle JDK 8 and later, Open JDK 8 and later, IBM JDK 8 and later</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">OS</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Linux (any flavor), Mac OSX (10.6 and up), Windows (XP and up), |
| Windows Server (2008 and up), Oracle Solaris</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ISA</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">x86, x64, SPARC, PowerPC</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Network</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No restrictions (10G recommended)</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>If you use Java version 11 or later, see <a href="#running-ignite-with-java-11-or-later">Running Ignite with Java 11 or later</a> for details.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="installing-ignite">Installing Ignite</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To get started with the Apache Ignite binary distribution:</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Download the <a href="https://ignite.apache.org/download.cgi#binaries" target="_blank" rel="noopener">Ignite binary</a> |
| as a zip archive.</p> |
| </li> |
| <li> |
| <p>Unzip the zip archive into the installation folder in your system.</p> |
| </li> |
| <li> |
| <p>(Optional) Enable required <a href="/docs/latest/setup#enabling-modules">modules</a>.</p> |
| </li> |
| <li> |
| <p>(Optional) Set the <code>IGNITE_HOME</code> environment variable or Windows PATH to |
| point to the installation folder and make sure there is no trailing <code>/</code> (or |
| <code>\</code> for Windows) in the path.</p> |
| </li> |
| </ol> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="starting-a-node">Starting a Node</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>You can start a node from the command line using the default configuration or by passing a custom configuration file. |
| You can start as many nodes as you like and they will all automatically discover each other.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Navigate into the <code>bin</code> folder of the Ignite installation directory from the command shell. |
| Your command might look like this:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Unix'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell"><span class="nb">cd</span> <span class="o">{</span>IGNITE_HOME<span class="o">}</span>/bin/</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Window'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell"><span class="nb">cd</span> <span class="o">{</span>IGNITE_HOME<span class="o">}</span><span class="se">\b</span><span class="k">in</span><span class="se">\</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>Start a node with a custom configuration file that is passed as a parameter to <code>ignite.sh|bat</code> like this:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Unix'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell">./ignite.sh ../examples/config/example-ignite.xml</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Window'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell">ignite.bat ..<span class="se">\e</span>xamples<span class="se">\c</span>onfig<span class="se">\e</span>xample-ignite.xml</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>You will see output similar to this:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>[08:53:45] Ignite node started OK (id=7b30bc8e) |
| [08:53:45] Topology snapshot [ver=1, locNode=7b30bc8e, servers=1, clients=0, state=ACTIVE, CPUs=4, offheap=1.6GB, heap=2.0GB]</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Open another tab from your command shell and run the same command again:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Unix'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell">./ignite.sh ../examples/config/example-ignite.xml</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Windows'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell">ignite.bat ..<span class="se">\e</span>xamples<span class="se">\c</span>onfig<span class="se">\e</span>xample-ignite.xml</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>Check the <code>Topology snapshot</code> line in the output. |
| Now you have a cluster of two server nodes with more CPUs and RAM available cluster-wide:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>[08:54:34] Ignite node started OK (id=3a30b7a4) |
| [08:54:34] Topology snapshot [ver=2, locNode=3a30b7a4, servers=2, clients=0, state=ACTIVE, CPUs=4, offheap=3.2GB, heap=4.0GB]</pre> |
| </div> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| By default, <code>ignite.sh|bat</code> starts a node with the default configuration file: <code>config/default-config.xml</code>. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="running-your-first-application">Running Your First Application</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Once the cluster is started, follow the steps below to run a simple HelloWorld example.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="1-add-maven-dependency">1. Add Maven Dependency</h3> |
| <div class="paragraph"> |
| <p>The easiest way to get started with Ignite in Java is to use Maven dependency management.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Create a new Maven project with your favorite IDE and add the following dependencies in your project’s pom.xml file.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><properties></span> |
| <span class="nt"><ignite.version></span>2.9.1<span class="nt"></ignite.version></span> |
| <span class="nt"></properties></span> |
| |
| <span class="nt"><dependencies></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.ignite<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>ignite-core<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>${ignite.version}<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.ignite<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>ignite-spring<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>${ignite.version}<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"></dependencies></span></code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="2-helloworld-java">2. HelloWorld.java</h3> |
| <div class="paragraph"> |
| <p>Here is a sample HelloWord.java file that prints 'Hello World' and some other environment details on all |
| the server nodes of the cluster. |
| The sample shows how to prepare a cluster configuration with Java APIs, create a sample cache with some data in it, and execute custom Java logic on the server nodes.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloWorld</span> <span class="o">{</span> |
| <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="nc">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">IgniteException</span> <span class="o">{</span> |
| <span class="c1">// Preparing IgniteConfiguration using Java APIs</span> |
| <span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// The node will be started as a client node.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setClientMode</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Classes of custom Java logic will be transferred over the wire from this app.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setPeerClassLoadingEnabled</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Setting up an IP Finder to ensure the client can locate the servers.</span> |
| <span class="nc">TcpDiscoveryMulticastIpFinder</span> <span class="n">ipFinder</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">TcpDiscoveryMulticastIpFinder</span><span class="o">();</span> |
| <span class="n">ipFinder</span><span class="o">.</span><span class="na">setAddresses</span><span class="o">(</span><span class="nc">Collections</span><span class="o">.</span><span class="na">singletonList</span><span class="o">(</span><span class="s">"127.0.0.1:47500..47509"</span><span class="o">));</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setDiscoverySpi</span><span class="o">(</span><span class="k">new</span> <span class="nc">TcpDiscoverySpi</span><span class="o">().</span><span class="na">setIpFinder</span><span class="o">(</span><span class="n">ipFinder</span><span class="o">));</span> |
| |
| <span class="c1">// Starting the node</span> |
| <span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span> |
| |
| <span class="c1">// Create an IgniteCache and put some values in it.</span> |
| <span class="nc">IgniteCache</span><span class="o"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">></span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">getOrCreateCache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| <span class="n">cache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="s">"Hello"</span><span class="o">);</span> |
| <span class="n">cache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="mi">2</span><span class="o">,</span> <span class="s">"World!"</span><span class="o">);</span> |
| |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">">> Created the cache and add the values."</span><span class="o">);</span> |
| |
| <span class="c1">// Executing custom Java compute task on server nodes.</span> |
| <span class="n">ignite</span><span class="o">.</span><span class="na">compute</span><span class="o">(</span><span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">forServers</span><span class="o">()).</span><span class="na">broadcast</span><span class="o">(</span><span class="k">new</span> <span class="nc">RemoteTask</span><span class="o">());</span> |
| |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">">> Compute task is executed, check for output on the server nodes."</span><span class="o">);</span> |
| |
| <span class="c1">// Disconnect from the cluster.</span> |
| <span class="n">ignite</span><span class="o">.</span><span class="na">close</span><span class="o">();</span> |
| <span class="o">}</span> |
| |
| <span class="cm">/** |
| * A compute tasks that prints out a node ID and some details about its OS and JRE. |
| * Plus, the code shows how to access data stored in a cache from the compute task. |
| */</span> |
| <span class="kd">private</span> <span class="kd">static</span> <span class="kd">class</span> <span class="nc">RemoteTask</span> <span class="kd">implements</span> <span class="nc">IgniteRunnable</span> <span class="o">{</span> |
| <span class="nd">@IgniteInstanceResource</span> |
| <span class="nc">Ignite</span> <span class="n">ignite</span><span class="o">;</span> |
| |
| <span class="nd">@Override</span> <span class="kd">public</span> <span class="kt">void</span> <span class="nf">run</span><span class="o">()</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">">> Executing the compute task"</span><span class="o">);</span> |
| |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span> |
| <span class="s">" Node ID: "</span> <span class="o">+</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">localNode</span><span class="o">().</span><span class="na">id</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\n"</span> <span class="o">+</span> |
| <span class="s">" OS: "</span> <span class="o">+</span> <span class="nc">System</span><span class="o">.</span><span class="na">getProperty</span><span class="o">(</span><span class="s">"os.name"</span><span class="o">)</span> <span class="o">+</span> |
| <span class="s">" JRE: "</span> <span class="o">+</span> <span class="nc">System</span><span class="o">.</span><span class="na">getProperty</span><span class="o">(</span><span class="s">"java.runtime.name"</span><span class="o">));</span> |
| |
| <span class="nc">IgniteCache</span><span class="o"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">></span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">">> "</span> <span class="o">+</span> <span class="n">cache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">1</span><span class="o">)</span> <span class="o">+</span> <span class="s">" "</span> <span class="o">+</span> <span class="n">cache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">2</span><span class="o">));</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre> |
| </div> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Don’t forget to add imports for HelloWorld.java. It should be trivial as long as Maven solves all of the dependencies.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Plus, you might need to add these settings to your pom.xml if the IDE keeps using Java compiler from a version earlier than 1.8:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><build></span> |
| <span class="nt"><plugins></span> |
| <span class="nt"><plugin></span> |
| <span class="nt"><groupId></span>org.apache.maven.plugins<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>maven-compiler-plugin<span class="nt"></artifactId></span> |
| <span class="nt"><configuration></span> |
| <span class="nt"><source></span>1.8<span class="nt"></source></span> |
| <span class="nt"><target></span>1.8<span class="nt"></target></span> |
| <span class="nt"></configuration></span> |
| <span class="nt"></plugin></span> |
| <span class="nt"></plugins></span> |
| <span class="nt"></build></span></code></pre> |
| </div> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="3-run-helloworld-java">3. Run HelloWorld.java</h3> |
| <div class="paragraph"> |
| <p>Run HelloWorld.java. You will see 'Hello World!' and other environment details printed on all the server nodes.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="further-examples">Further Examples</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Your Ignite installation includes additional examples. These examples are shipped together with the primary Ignite package you downloaded as part of the Ignite installation above.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To run the examples project please follow these steps (which are provided for IntelliJ IDEA IDE, but should apply to similar IDEs such as Eclipse):</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Start IntelliJ IDEA, click the "Import Project" button:</p> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.1/images/ijimport.png" alt="Importing a Project in IntelliJ"> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Navigate to the <code>{IGNITE_HOME}/examples</code> folder and select the <code>{IGNITE}/examples/pom.xml</code> file. Click "OK".</p> |
| </li> |
| <li> |
| <p>Click "Next" on each of the following screens and apply the suggested defaults to the project. Click "Finish".</p> |
| </li> |
| <li> |
| <p>Wait while IntelliJ IDEA finishes setting up Maven, resolving dependencies, and loading modules.</p> |
| </li> |
| <li> |
| <p>Set up JDK if needed.</p> |
| </li> |
| <li> |
| <p>Run <code>src/main/java/org/apache/ignite/examples/datagrid/CacheApiExample</code>:</p> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.1/images/ijrun.png" alt="Run a project in IntelliJ"> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Make sure that the example has been started and executed successfully, as shown in the image below.</p> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.1/images/ijfull.png" alt="Project in IntelliJ"> |
| </div> |
| </div> |
| </li> |
| </ol> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="running-ignite-with-java-11-or-later">Running Ignite with Java 11 or later</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To run Ignite with Java 11 or later, follow these steps:</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Set the <code>JAVA_HOME</code> environment variable to point to the Java installation |
| directory.</p> |
| </li> |
| <li> |
| <p>Ignite uses proprietary SDK APIs that are not available by |
| default. You need to pass specific flags to JVM to make these APIs |
| available. If you use the start-up script <code>ignite.sh</code> (or <code>ignite.bat</code> for Windows), you do not need |
| to do anything because these flags are already set up in the script. |
| Otherwise, provide the following parameters to the JVM of your |
| application:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell"><span class="nt">--add-exports</span><span class="o">=</span>java.base/jdk.internal.misc<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--add-exports</span><span class="o">=</span>java.base/sun.nio.ch<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--add-exports</span><span class="o">=</span>java.management/com.sun.jmx.mbeanserver<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--add-exports</span><span class="o">=</span>jdk.internal.jvmstat/sun.jvmstat.monitor<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--add-exports</span><span class="o">=</span>java.base/sun.reflect.generics.reflectiveObjects<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--add-opens</span><span class="o">=</span>jdk.management/com.sun.management.internal<span class="o">=</span>ALL-UNNAMED |
| <span class="nt">--illegal-access</span><span class="o">=</span>permit</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>TLSv1.3, which is available in Java 11, is not supported at the |
| moment. Consider adding <code>‑Djdk.tls.client.protocols=TLSv1.2</code> if SSL |
| between nodes is used.</p> |
| </li> |
| </ol> |
| </div> |
| </div> |
| </div> |
| <div class="copyright"> |
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| <li><a href="#prerequisites">Prerequisites</a></li> |
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| <li><a href="#starting-a-node">Starting a Node</a></li> |
| <li><a href="#running-your-first-application">Running Your First Application</a> |
| <ul class="sectlevel2"> |
| <li><a href="#1-add-maven-dependency">1. Add Maven Dependency</a></li> |
| <li><a href="#2-helloworld-java">2. HelloWorld.java</a></li> |
| <li><a href="#3-run-helloworld-java">3. Run HelloWorld.java</a></li> |
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| <li><a href="#further-examples">Further Examples</a></li> |
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