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<div class="headertitle"><div class="title">Using HDF5 Maven Artifacts </div></div>
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<div class="textblock"><p>Navigate back: <a class="el" href="index.html" title="notitle">Main</a> / <a class="el" href="_cookbook.html" title="Cookbook">Cookbook</a> </p><hr />
<h1 class="doxsection"><a class="anchor" id="sec_maven_intro"></a>
Using HDF5 Java Bindings with Maven</h1>
<dl class="section user"><dt>Problem</dt><dd>I want to use HDF5 Java bindings in my Maven project without building from source.</dd></dl>
<dl class="section user"><dt>Solution</dt><dd>HDF5 Java bindings are available as Maven artifacts with platform-specific JARs for both JNI and FFM implementations. Use the appropriate artifact and classifier for your platform and Java version.</dd></dl>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_artifacts"></a>
Maven Artifact Selection</h2>
<p>HDF5 provides three main Maven artifacts:</p>
<table class="doxtable">
<tr>
<th>Artifact ID</th><th>Java Version</th><th>Description</th><th>Status</th></tr>
<tr>
<td><b>hdf5-java-jni</b></td><td>Java 8+</td><td>JNI implementation (default)</td><td>Production-ready</td></tr>
<tr>
<td><b>hdf5-java-ffm</b></td><td>Java 25+</td><td>FFM implementation (future default)</td><td>Production-ready</td></tr>
<tr>
<td><b>hdf5-java-examples</b></td><td>Java 8+</td><td>example programs</td><td>Platform-independent</td></tr>
</table>
<p><em>Note: FFM will become the default implementation in the next major HDF5 release.</em></p>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_jni"></a>
Using JNI Implementation (Java 8+)</h2>
<dl class="section user"><dt>Basic Usage</dt><dd>Add the following dependency to your <code>pom.xml</code>:</dd></dl>
<div class="fragment"><div class="line">&lt;<span class="keywordtype">dependency</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">groupId</span>&gt;<span class="keyword">org.hdfgroup</span>&lt;/<span class="keywordtype">groupId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">artifactId</span>&gt;<span class="keyword">hdf5-java-jni</span>&lt;/<span class="keywordtype">artifactId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">version</span>&gt;2.0.0&lt;/<span class="keywordtype">version</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">classifier</span>&gt;<span class="keyword">linux-x86_64</span>&lt;/<span class="keywordtype">classifier</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">dependency</span>&gt;</div>
</div><!-- fragment --><p>Replace the classifier with your platform: </p><ul>
<li><code>linux-x86_64</code> - Linux 64-bit </li>
<li><code>windows-x86_64</code> - Windows 64-bit </li>
<li><code>macos-x86_64</code> - macOS Intel </li>
<li><code>macos-aarch64</code> - macOS Apple Silicon</li>
</ul>
<dl class="section user"><dt>Java Code</dt><dd><div class="fragment"><div class="line"><span class="keyword">import</span> hdf.hdf5lib.H5;</div>
<div class="line"><span class="keyword">import</span> hdf.hdf5lib.HDF5Constants;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">public</span> <span class="keyword">class </span>MyHDF5App {</div>
<div class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">void</span> main(String[] args) <span class="keywordflow">throws</span> Exception {</div>
<div class="line"> <span class="comment">// Initialize HDF5 library</span></div>
<div class="line"> <a class="code hl_namespace" href="namespace_h5.html">H5</a>.H5open();</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Your HDF5 operations here</span></div>
<div class="line"> <span class="keywordtype">long</span> file_id = <a class="code hl_namespace" href="namespace_h5.html">H5</a>.H5Fcreate(<span class="stringliteral">&quot;myfile.h5&quot;</span>,</div>
<div class="line"> HDF5Constants.H5F_ACC_TRUNC,</div>
<div class="line"> HDF5Constants.H5P_DEFAULT,</div>
<div class="line"> HDF5Constants.H5P_DEFAULT);</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Clean up</span></div>
<div class="line"> <a class="code hl_namespace" href="namespace_h5.html">H5</a>.H5Fclose(file_id);</div>
<div class="line"> <a class="code hl_namespace" href="namespace_h5.html">H5</a>.H5close();</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="ttc" id="anamespace_h5_html"><div class="ttname"><a href="namespace_h5.html">H5</a></div><div class="ttdef"><b>Definition</b> H5AbstractDs.cpp:33</div></div>
</div><!-- fragment --></dd></dl>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_ffm"></a>
Using FFM Implementation (Java 25+)</h2>
<dl class="section user"><dt>Basic Usage</dt><dd>Add the following dependency to your <code>pom.xml</code>:</dd></dl>
<div class="fragment"><div class="line">&lt;<span class="keywordtype">dependency</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">groupId</span>&gt;<span class="keyword">org.hdfgroup</span>&lt;/<span class="keywordtype">groupId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">artifactId</span>&gt;<span class="keyword">hdf5-java-ffm</span>&lt;/<span class="keywordtype">artifactId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">version</span>&gt;2.0.0&lt;/<span class="keywordtype">version</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">classifier</span>&gt;<span class="keyword">linux-x86_64</span>&lt;/<span class="keywordtype">classifier</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">dependency</span>&gt;</div>
</div><!-- fragment --><dl class="section user"><dt>Java Runtime Configuration</dt><dd>FFM requires enabling native access: <div class="fragment"><div class="line">java --enable-native-access=ALL-UNNAMED -cp yourapp.jar com.example.Main</div>
</div><!-- fragment --></dd></dl>
<p>Or configure in <code>pom.xml</code>: </p><div class="fragment"><div class="line">&lt;<span class="keywordtype">plugin</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">groupId</span>&gt;<span class="keyword">org.apache.maven.plugins</span>&lt;/<span class="keywordtype">groupId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">artifactId</span>&gt;<span class="keyword">maven-surefire-plugin</span>&lt;/<span class="keywordtype">artifactId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">configuration</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">argLine</span>&gt;--<span class="keyword">enable-native-access</span>=<span class="keyword">ALL-UNNAMED</span>&lt;/<span class="keywordtype">argLine</span>&gt;</div>
<div class="line"> &lt;/<span class="keywordtype">configuration</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">plugin</span>&gt;</div>
</div><!-- fragment --><dl class="section user"><dt>Java Code</dt><dd>The API is identical to JNI - same code works with both implementations: <div class="fragment"><div class="line"><span class="keyword">import</span> hdf.hdf5lib.H5;</div>
<div class="line"><span class="keyword">import</span> hdf.hdf5lib.HDF5Constants;</div>
<div class="line"> </div>
<div class="line"><span class="comment">// Same code as JNI example above</span></div>
</div><!-- fragment --></dd></dl>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_examples"></a>
Using Java Examples</h2>
<dl class="section user"><dt>Adding Examples Artifact</dt><dd><div class="fragment"><div class="line">&lt;<span class="keywordtype">dependency</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">groupId</span>&gt;<span class="keyword">org.hdfgroup</span>&lt;/<span class="keywordtype">groupId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">artifactId</span>&gt;<span class="keyword">hdf5-java-examples</span>&lt;/<span class="keywordtype">artifactId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">version</span>&gt;2.0.0&lt;/<span class="keywordtype">version</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">dependency</span>&gt;</div>
</div><!-- fragment --></dd></dl>
<p>The examples artifact contains 62 educational examples covering: </p><ul>
<li>File operations and dataset creation </li>
<li>Compound datatypes and variable-length data </li>
<li>Groups, attributes, and links </li>
<li>Chunking, compression, and filters </li>
<li>Parallel I/O examples</li>
</ul>
<dl class="section user"><dt>Running Examples</dt><dd><div class="fragment"><div class="line"><span class="preprocessor"># List available examples</span></div>
<div class="line">java -cp <a class="code hl_namespace" href="namespacehdf5.html">hdf5</a>-java-examples-2.0.0.jar examples.intro.H5_CreateFile</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># Run a specific example</span></div>
<div class="line">java -cp <span class="stringliteral">&quot;hdf5-java-jni-2.0.0-linux-x86_64.jar:hdf5-java-examples-2.0.0.jar&quot;</span> \</div>
<div class="line"> examples.intro.H5_CreateFile</div>
<div class="ttc" id="anamespacehdf5_html"><div class="ttname"><a href="namespacehdf5.html">hdf5</a></div><div class="ttdef"><b>Definition</b> HDF5.F90:26</div></div>
</div><!-- fragment --></dd></dl>
<p>See <code>HDF5Examples/JAVA/README-MAVEN.md</code> for complete details.</p>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_repositories"></a>
Maven Repositories</h2>
<dl class="section user"><dt>GitHub Packages (Current)</dt><dd>HDF5 artifacts are published to GitHub Packages. Add this repository to your <code>pom.xml</code>:</dd></dl>
<div class="fragment"><div class="line">&lt;<span class="keywordtype">repositories</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">repository</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">id</span>&gt;<span class="keyword">github-hdfgroup</span>&lt;/<span class="keywordtype">id</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">name</span>&gt;<span class="keyword">HDF</span> <span class="keyword">Group</span> <span class="keyword">GitHub</span> <span class="keyword">Packages</span>&lt;/<span class="keywordtype">name</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">url</span>&gt;<span class="keyword">https:</span>//<span class="keyword">maven.pkg.github.com</span>/<span class="keyword">HDFGroup</span>/<span class="keyword">hdf5</span>&lt;/<span class="keywordtype">url</span>&gt;</div>
<div class="line"> &lt;/<span class="keywordtype">repository</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">repositories</span>&gt;</div>
</div><!-- fragment --><p><b>Note:</b> GitHub Packages requires authentication even for public packages. Add credentials to your <code>~/.m2/settings.xml</code>:</p>
<div class="fragment"><div class="line">&lt;<span class="keywordtype">servers</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">server</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">id</span>&gt;<span class="keyword">github-hdfgroup</span>&lt;/<span class="keywordtype">id</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">username</span>&gt;<span class="keyword">YOUR_GITHUB_USERNAME</span>&lt;/<span class="keywordtype">username</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">password</span>&gt;<span class="keyword">YOUR_GITHUB_TOKEN</span>&lt;/<span class="keywordtype">password</span>&gt;</div>
<div class="line"> &lt;/<span class="keywordtype">server</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">servers</span>&gt;</div>
</div><!-- fragment --><p>Generate a GitHub personal access token with <code>read:packages</code> permission.</p>
<dl class="section user"><dt>Maven Central (Coming Soon)</dt><dd>Future releases will be available on Maven Central, which does not require authentication:</dd></dl>
<div class="fragment"><div class="line"><span class="comment">&lt;!-- Maven Central (future releases) --&gt;</span></div>
<div class="line">&lt;<span class="keywordtype">dependency</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">groupId</span>&gt;<span class="keyword">org.hdfgroup</span>&lt;/<span class="keywordtype">groupId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">artifactId</span>&gt;<span class="keyword">hdf5-java-jni</span>&lt;/<span class="keywordtype">artifactId</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">version</span>&gt;2.1.0&lt;/<span class="keywordtype">version</span>&gt;</div>
<div class="line"> &lt;<span class="keywordtype">classifier</span>&gt;<span class="keyword">linux-x86_64</span>&lt;/<span class="keywordtype">classifier</span>&gt;</div>
<div class="line">&lt;/<span class="keywordtype">dependency</span>&gt;</div>
</div><!-- fragment --><h2 class="doxsection"><a class="anchor" id="subsec_maven_troubleshooting"></a>
Troubleshooting</h2>
<dl class="section user"><dt>UnsatisfiedLinkError</dt><dd>If you see <code>java.lang.UnsatisfiedLinkError</code>: <ul>
<li>Verify you're using the correct platform classifier </li>
<li>Ensure only ONE HDF5 artifact (JNI or FFM) is on classpath </li>
<li>Check Java version matches implementation (Java 25+ for FFM) </li>
<li>Install HDF5 native libraries: <code>sudo apt-get install libhdf5-dev</code> (Linux) or <code>brew install <a class="el" href="namespacehdf5.html">hdf5</a></code> (macOS)</li>
</ul>
</dd></dl>
<dl class="section user"><dt>Native Access Error (FFM only)</dt><dd>If you see <code>IllegalCallerException</code> with FFM: <ul>
<li>Add <code>&ndash;enable-native-access=ALL-UNNAMED</code> to Java command </li>
<li>Or configure in build tool (Maven, Gradle)</li>
</ul>
</dd></dl>
<dl class="section user"><dt>Version Conflicts</dt><dd>If you see dependency conflicts: <ul>
<li>Use <code>&lt;dependencyManagement&gt;</code> to control versions </li>
<li>Exclude transitive HDF5 dependencies if needed </li>
<li>Ensure all HDF5 artifacts use the same version</li>
</ul>
</dd></dl>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_migration"></a>
Migrating Between JNI and FFM</h2>
<dl class="section user"><dt>API Compatibility</dt><dd>Both implementations use identical APIs: <ul>
<li>Same package names: <code><a class="el" href="namespacehdf_1_1hdf5lib.html">hdf.hdf5lib</a>.*</code> </li>
<li>Same class names: <code><a class="el" href="namespace_h5.html">H5</a>, HDF5Constants</code> </li>
<li>Same method signatures </li>
<li>Same exception handling</li>
</ul>
</dd></dl>
<dl class="section user"><dt>Migration Steps</dt><dd><ol type="1">
<li>Update artifact ID in <code>pom.xml</code>: <ul>
<li>Change <code>hdf5-java-jni</code> to <code>hdf5-java-ffm</code> </li>
<li>Or vice versa</li>
</ul>
</li>
<li>For FFM: Add native access flag <ul>
<li><code>&ndash;enable-native-access=ALL-UNNAMED</code></li>
</ul>
</li>
<li>Rebuild and test <ul>
<li>No code changes required!</li>
</ul>
</li>
</ol>
</dd></dl>
<h2 class="doxsection"><a class="anchor" id="subsec_maven_testing"></a>
Testing Maven Artifacts</h2>
<dl class="section user"><dt>Local Testing Scripts</dt><dd>HDF5 provides test scripts to verify Maven artifacts work correctly:</dd></dl>
<div class="fragment"><div class="line">cd HDF5Examples/JAVA</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># Test JNI implementation</span></div>
<div class="line">./test-maven-jni.sh 2.0.0</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># Test FFM implementation</span></div>
<div class="line">./test-maven-ffm.sh 2.0.0</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># Test against custom repository</span></div>
<div class="line">./test-maven-ffm.sh 2.0.0 https:<span class="comment">//maven.pkg.github.com/YOUR_FORK/hdf5</span></div>
</div><!-- fragment --><p>These scripts automatically: </p><ul>
<li>Configure GitHub authentication </li>
<li>Download and verify JARs </li>
<li>Compile and run example programs </li>
<li>Report detailed test results</li>
</ul>
<p>See <code>HDF5Examples/JAVA/README-MAVEN.md</code> for complete testing documentation.</p>
<dl class="section user"><dt>See Also</dt><dd><ul>
<li><a class="el" href="cmake-presets.html#subsec_cmake_presets_build_java" title="CMake Presets Use Case: Java Bindings">CMake Presets Use Case: Java Bindings</a> for building from source </li>
<li>release_docs/README.md for complete Maven documentation </li>
<li>HDF5Examples/JAVA/README-MAVEN.md for testing and examples with Maven </li>
<li>HDF5Examples/JAVA/test-maven-jni.sh for JNI artifact testing </li>
<li>HDF5Examples/JAVA/test-maven-ffm.sh for FFM artifact testing </li>
<li><a href="https://github.com/HDFGroup/hdf5-examples">https://github.com/HDFGroup/hdf5-examples</a> for more examples</li>
</ul>
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Navigate back: <a class="el" href="index.html" title="notitle">Main</a> / <a class="el" href="_cookbook.html" title="Cookbook">Cookbook</a> </dd></dl>
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