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| <h1 class="title">Combining Apache Jena jars</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li> |
| <ul> |
| <li> |
| <ul> |
| <li><a href="#maven">Maven</a></li> |
| <li><a href="#gradle">Gradle</a></li> |
| <li><a href="#manual-assembling">Manual assembling</a></li> |
| </ul> |
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| <article class="flex-column me-lg-4"> |
| <p>Apache Jena initializes uses Java’s |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html">ServiceLoader</a> |
| mechanism to locate initialization steps. The |
| documentation for process in Jena is <a href="system-initialization.html">available here</a>.</p> |
| <p>There are a number of files (Java resources) in Jena jars named:</p> |
| <pre><code>META-INF/services/org.apache.jena.sys.JenaSubsystemLifecycle |
| </code></pre> |
| <p>Each has different contents, usually one or two lines.</p> |
| <p>When making a combined jar (“uber-jar”, jar with dependencies) from Jena |
| dependencies and application code, the contents of the Jena files must |
| be combined and be present in the combined jar as a java resource of the |
| same name.</p> |
| <h4 id="maven">Maven</h4> |
| <p>The |
| <a href="https://maven.apache.org/plugins/maven-shade-plugin/">maven shade plugin</a> |
| is capable of doing this process in a build using a “transformer”.</p> |
| <p>The Apache Jena uses the shade plugin technique itself to make the combined jar |
| for Fuseki. It uses the maven shade plugin with a <code>transformer</code>.</p> |
| <p>This is an extract from the POM:</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-xml" data-lang="xml"><span style="display:flex;"><span><span style="color:#008000;font-weight:bold"><plugin></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"><groupId></span>org.apache.maven.plugins<span style="color:#008000;font-weight:bold"></groupId></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"><artifactId></span>maven-shade-plugin<span style="color:#008000;font-weight:bold"></artifactId></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"><configuration></span> |
| </span></span><span style="display:flex;"><span> ... |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"><transformers></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"><transformer</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">implementation=</span><span style="color:#b44">"org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"</span><span style="color:#008000;font-weight:bold">/></span> |
| </span></span><span style="display:flex;"><span> ... other transformers ... |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"></transformers></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold"></configuration></span> |
| </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold"></plugin></span> |
| </span></span></code></pre></div><p>See |
| <a href="https://github.com/apache/jena/blob/main/jena-fuseki2/jena-fuseki-server/pom.xml">jena-fuseki2/jena-fuseki-server/pom.xml</a> |
| for the complete shade plugin setup used by Fuseki.</p> |
| <h4 id="gradle">Gradle</h4> |
| <p>For Gradle, the <a href="https://plugins.gradle.org/plugin/com.github.johnrengelman.shadow">shadowJar plugin</a> |
| has the |
| <a href="https://imperceptiblethoughts.com/shadow/configuration/merging/#merging-service-descriptor-files">mergeServiceFiles</a> |
| operation.</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-groovy" data-lang="groovy"><span style="display:flex;"><span>plugins <span style="color:#666">{</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#666">...</span> |
| </span></span><span style="display:flex;"><span> id <span style="color:#b44">"com.github.johnrengelman.shadow"</span> version <span style="color:#b44">"7.1.2"</span> |
| </span></span><span style="display:flex;"><span><span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span>shadowJar <span style="color:#666">{</span> |
| </span></span><span style="display:flex;"><span> mergeServiceFiles<span style="color:#666">()</span> |
| </span></span><span style="display:flex;"><span><span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span><span style="color:#666">...</span> |
| </span></span></code></pre></div><h4 id="manual-assembling">Manual assembling</h4> |
| <p>If doing manually, create a single file (<code>META-INF/services/org.apache.jena.sys.JenaSubsystemLifecycle</code>) in your application jar containing the |
| lines of all the services resource files. The order does not matter. |
| Jena calls modules in the right order.</p> |
| |
| </article> |
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