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class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Pulsar Functions</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/3.1.x/functions-package/"><span itemprop="name">How-to: Package</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Package Java Functions</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Package Java Functions</h1></header><p>There are two methods to package Java Functions, that is <a href="#package-as-jar">uber JAR</a> and <a href="#package-as-nar">NAR</a>.</p><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_S0QG"><p>If you plan to package and distribute your function for others to use, you are obligated to
license and copyright your own code properly. Remember to add the license and copyright to
all libraries your code uses and to your distribution.</p><p>If you use the <a href="#package-as-nar">NAR</a> method, the NAR plugin
automatically creates a <code>DEPENDENCIES</code> file in the generated NAR package, including the proper
licensing and copyrights of all libraries of your function.</p><p>For the runtime Java version, refer to <a href="https://github.com/apache/pulsar/blob/master/README.md#pulsar-runtime-java-version-recommendation" target="_blank" rel="noopener noreferrer">Pulsar Runtime Java Version Recommendation</a> according to your target Pulsar version.</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="package-as-jar">Package as JAR<a href="#package-as-jar" class="hash-link" aria-label="Direct link to Package as JAR" title="Direct link to Package as JAR">​</a></h2><p>To package a Java function as JAR, complete the following steps.</p><ol><li><p>Create a new maven project with a pom file. In the following code sample, the value of <code>mainClass</code> is your package name.</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token prolog" style="color:rgb(189, 147, 249)">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">project</span><span class="token tag" style="color:rgb(255, 121, 198)"> </span><span class="token tag attr-name" style="color:rgb(241, 250, 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242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.apache.maven.plugins</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">maven-compiler-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">3.11.0</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">configuration</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">release</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">17</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">release</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">configuration</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugins</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">build</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">project</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Package your Java function.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> mvn package</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>After the Java function is packaged, a <code>target</code> directory is created automatically. Open the <code>target</code> directory to check if there is a JAR package similar to <code>java-function-1.0-SNAPSHOT.jar</code>.</p></li><li><p>Copy the packaged jar file to the Pulsar image.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">docker</span><span class="token plain"> </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">exec</span><span class="token plain"> -it </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">CONTAINER ID</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> /bin/bash</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">docker</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">cp</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain">path of java-function-1.0-SNAPSHOT.jar</span><span class="token operator">&gt;</span><span class="token plain"> CONTAINER ID:/pulsar</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Run the Java function using the following command.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ./bin/pulsar-admin functions localrun </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --classname org.example.test.ExclamationFunction </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jar java-function-1.0-SNAPSHOT.jar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --inputs persistent://public/default/my-topic-1 </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output persistent://public/default/test-1 </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --tenant public </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --namespace default </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --name JavaFunction</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The following log indicates that the Java function starts successfully.</p><div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ...</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> 07:55:03.724 [main] INFO org.apache.pulsar.functions.runtime.ProcessRuntime - Started process successfully</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ...</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="package-as-nar">Package as NAR<a href="#package-as-nar" class="hash-link" aria-label="Direct link to Package as NAR" title="Direct link to Package as NAR">​</a></h2><p>To package a Java function as NAR, complete the following steps.</p><ol><li><p>Create a new maven project with a pom file.</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token prolog" style="color:rgb(189, 147, 249)">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">project</span><span class="token tag" style="color:rgb(255, 121, 198)"> </span><span class="token tag attr-name" style="color:rgb(241, 250, 140)">xmlns</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(248, 248, 242)">=</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag attr-value" style="color:rgb(255, 121, 198)">http://maven.apache.org/POM/4.0.0</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag" style="color:rgb(255, 121, 198)"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token tag" style="color:rgb(255, 121, 198)"> </span><span class="token tag attr-name namespace" style="color:rgb(241, 250, 140)">xmlns:</span><span class="token tag attr-name" style="color:rgb(241, 250, 140)">xsi</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(248, 248, 242)">=</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag attr-value" style="color:rgb(255, 121, 198)">http://www.w3.org/2001/XMLSchema-instance</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag" style="color:rgb(255, 121, 198)"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token tag" style="color:rgb(255, 121, 198)"> </span><span class="token tag attr-name namespace" style="color:rgb(241, 250, 140)">xsi:</span><span class="token tag attr-name" style="color:rgb(241, 250, 140)">schemaLocation</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(248, 248, 242)">=</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag attr-value" style="color:rgb(255, 121, 198)">http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd</span><span class="token tag attr-value punctuation" style="color:rgb(248, 248, 242)">&quot;</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">modelVersion</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">4.0.0</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">modelVersion</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">java-function</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">java-function</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">1.0-SNAPSHOT</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependencies</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.apache.pulsar</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">pulsar-functions-api</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">3.1.3</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependencies</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">build</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">plugins</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.apache.nifi</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">nifi-nar-maven-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">1.5.0</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.apache.maven.plugins</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">maven-compiler-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">3.11.0</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">version</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">configuration</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">release</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">17</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">release</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">configuration</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">plugins</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">build</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">project</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>You must also create a <code>resources/META-INF/services/pulsar-io.yaml</code> file. In the following code sample, the value of <code>functionClass</code> is your function class name. The <code>name</code> is the one used when the Function is deployed as a <a href="/docs/3.1.x/functions-deploy-cluster-builtin/">built-in</a> one.</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> java</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">function</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> my java function</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key atrule">functionClass</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> org.example.test.ExclamationFunction</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Package your Java function.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">mvn package</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>After the Java function is packaged, a <code>target</code> directory is created automatically. Open the <code>target</code> directory to check if there is a NAR package similar to <code>java-function-1.0-SNAPSHOT.nar</code>.</p></li><li><p>Copy the packaged NAR file to the Pulsar image.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">docker</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">cp</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain">path of java-function-1.0-SNAPSHOT.nar</span><span class="token operator">&gt;</span><span class="token plain"> CONTAINER ID:/pulsar</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Run the Java function using the following command.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ./bin/pulsar-admin functions localrun </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jar java-function-1.0-SNAPSHOT.nar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --inputs persistent://public/default/my-topic-1 </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output persistent://public/default/test-1 </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --tenant public </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --namespace default </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --name JavaFunction</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The following log indicates that the Java function starts successfully.</p><div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ...</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> 07:55:03.724 [main] INFO org.apache.pulsar.functions.runtime.ProcessRuntime - Started process successfully</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ...</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span 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