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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">Contributing</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Building the code</span><meta itemprop="position" content="2"></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>Building the code</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="using-maven">Using Maven<a href="#using-maven" class="hash-link" aria-label="Direct link to Using Maven" title="Direct link to Using Maven"></a></h2><p>To build from source, you need the following installed and available in your <code>$PATH:</code></p><ul><li><p><a href="https://java.oracle.com" target="_blank" rel="noopener noreferrer">Java 11</a></p></li><li><p><a href="https://maven.apache.org/" target="_blank" rel="noopener noreferrer">Apache maven 3.3.4 or greater</a></p></li></ul><p>After cloning the project, you can build it from source with this 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">mvn clean </span><span class="token function" style="color:rgb(80, 250, 123)">install</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>If you don&#x27;t have maven installed, you may directly use the included <a href="https://github.com/takari/maven-wrapper" target="_blank" rel="noopener noreferrer">maven wrapper</a>, and build with the 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">./mvnw clean </span><span class="token function" style="color:rgb(80, 250, 123)">install</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><h2 class="anchor anchorWithStickyNavbar_LWe7" id="using-docker">Using Docker<a href="#using-docker" class="hash-link" aria-label="Direct link to Using Docker" title="Direct link to Using Docker"></a></h2><p>You can use <code>run-in-docker.sh</code> to do all development. This script maps your local repository to <code>/gen</code>
in the docker container. It also maps <code>~/.m2/repository</code> to the appropriate container location.</p><p>To execute <code>mvn package</code>:</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 function" style="color:rgb(80, 250, 123)">git</span><span class="token plain"> clone https://github.com/openapitools/openapi-generator</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">cd</span><span class="token plain"> openapi-generator</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">./run-in-docker.sh 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>Build artifacts are now accessible in your working directory.</p><p>Once built, <code>run-in-docker.sh</code> will act as an executable for openapi-generator-cli. To generate code, you&#x27;ll need to output to a directory under <code>/gen</code> (e.g. <code>/gen/out</code>). For example:</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">./run-in-docker.sh </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">help</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)"># Executes &#x27;help&#x27; command for openapi-generator-cli</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">./run-in-docker.sh list </span><span class="token comment" style="color:rgb(98, 114, 164)"># Executes &#x27;list&#x27; command for openapi-generator-cli</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">./run-in-docker.sh /gen/bin/generate-samples.sh /gen/bin/configs/go-petstore.yaml </span><span class="token comment" style="color:rgb(98, 114, 164)"># Builds the Go client</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">./run-in-docker.sh generate -i modules/openapi-generator/src/test/resources/3_0/petstore.yaml </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"> -g go -o /gen/out/go-petstore -p </span><span class="token assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">packageName</span><span class="token operator">=</span><span class="token plain">petstore </span><span class="token comment" style="color:rgb(98, 114, 164)"># generates go client, outputs locally to ./out/go-petstore</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="docker-in-vagrant">Docker in Vagrant<a href="#docker-in-vagrant" class="hash-link" aria-label="Direct link to Docker in Vagrant" title="Direct link to Docker in Vagrant"></a></h3><p>Prerequisite: install <a href="https://www.vagrantup.com/downloads.html" target="_blank" rel="noopener noreferrer">Vagrant</a> and <a href="https://www.virtualbox.org/wiki/Downloads" target="_blank" rel="noopener noreferrer">VirtualBox</a>.</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 function" style="color:rgb(80, 250, 123)">git</span><span class="token plain"> clone https://github.com/openapitools/openapi-generator.git</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">cd</span><span class="token plain"> openapi-generator</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">vagrant up</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">vagrant </span><span class="token function" style="color:rgb(80, 250, 123)">ssh</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">cd</span><span class="token plain"> /vagrant</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">./run-in-docker.sh 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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="troubleshooting">Troubleshooting<a href="#troubleshooting" class="hash-link" aria-label="Direct link to Troubleshooting" title="Direct link to Troubleshooting"></a></h3><p>If an error like this occurs, just execute the <strong>mvn clean install -U</strong> command:</p><blockquote><p>org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.19.1:test (default-test) on project openapi-generator: A type incompatibility occurred while executing org.apache.maven.plugins:maven-surefire-plugin:2.19.1:test: java.lang.ExceptionInInitializerError cannot be cast to java.io.IOException</p></blockquote><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">./run-in-docker.sh mvn clean </span><span class="token function" style="color:rgb(80, 250, 123)">install</span><span class="token plain"> -U</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><blockquote><p>Failed to execute goal org.fortasoft:gradle-maven-plugin:1.0.8:invoke (default) on project openapi-generator-gradle-plugin-mvn-wrapper: org.gradle.tooling.BuildException: Could not execute build using Gradle distribution &#x27;<a href="https://services.gradle.org/distributions/gradle-4.7-bin.zip&#x27;" target="_blank" rel="noopener noreferrer">https://services.gradle.org/distributions/gradle-4.7-bin.zip&#x27;</a></p></blockquote><p>Right now: no solution for this one :|</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/OpenAPITools/openapi-generator/edit/master/website/../docs/building.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2023-06-02T12:59:18.000Z">Jun 2, 2023</time></b> by <b>Stefan Koppier</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/code-of-conduct"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Code of Conduct</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/new-generator"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Create a New Generator</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#using-maven" class="table-of-contents__link toc-highlight">Using Maven</a></li><li><a href="#using-docker" 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