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<p>Heron is designed to be fully backwards compatible with existing <a href="http://storm.apache.org/index.html">Apache
Storm</a> v1 projects, which means that you can
migrate an existing Storm <a href="heron-topology-concepts">topology</a> to Heron by making
just a few adjustments to the topology's <code>pom.xml</code> <a href="https://maven.apache.org/pom.html">Maven configuration
file</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="step-1-add-heron-dependencies-to-pomxml"></a><a href="#step-1-add-heron-dependencies-to-pomxml" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 1. Add Heron dependencies to  <code>pom.xml</code></h2>
<p>Copy the <a href="https://maven.apache.org/pom.html"><code>pom.xml</code></a> segments below and paste
them into your existing Storm <code>pom.xml</code> file in the <a href="https://maven.apache.org/pom.html#Dependencies">dependencies
block</a>.</p>
<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.heron<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>heron-api<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>0.20.4-incubating<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>compile<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.heron<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>heron-storm<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>0.20.4-incubating<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>compile<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-2-remove-storm-dependencies-from-pomxml"></a><a href="#step-2-remove-storm-dependencies-from-pomxml" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 2. Remove Storm dependencies from <code>pom.xml</code></h2>
<p>Delete the Storm dependency, which looks like this:</p>
<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.storm<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>storm-core<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>storm-VERSION<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>provided<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-3-if-needed-remove-the-clojure-plugin-from-pomxml"></a><a href="#step-3-if-needed-remove-the-clojure-plugin-from-pomxml" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 3 (if needed). Remove the Clojure plugin from <code>pom.xml</code></h2>
<p>Delete the <a href="https://maven.apache.org/pom.html#Plugins">Clojure plugin</a>, which
should look like this:</p>
<pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>com.theoryinpractise<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>clojure-maven-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>1.3.12<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">extensions</span>&gt;</span>true<span class="hljs-tag">&lt;/<span class="hljs-name">extensions</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">configuration</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">sourceDirectories</span>&gt;</span>
      <span class="hljs-tag">&lt;<span class="hljs-name">sourceDirectory</span>&gt;</span>src/clj<span class="hljs-tag">&lt;/<span class="hljs-name">sourceDirectory</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">sourceDirectories</span>&gt;</span>
  <span class="hljs-tag">&lt;/<span class="hljs-name">configuration</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-4-run-maven-commands"></a><a href="#step-4-run-maven-commands" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 4. Run Maven commands</h2>
<p>Run the following <a href="https://maven.apache.org/run.html">Maven lifecycle</a> commands:</p>
<pre><code class="hljs css language-bash">$ mvn clean
$ mvn compile
$ mvn package
</code></pre>
<blockquote>
<p><a href="http://storm.apache.org/releases/0.10.0/Distributed-RPC.html">Storm Distribute RPC</a> is deprecated in Heron.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="step-4-optional-launch-your-upgraded-heron-topology"></a><a href="#step-4-optional-launch-your-upgraded-heron-topology" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 4 (optional). Launch your upgraded Heron topology</h2>
<p>You can launch the compiled Maven project on your <a href="schedulers-local">local
cluster</a> using <code>heron submit</code>.</p>
<p>First, modify your project's base directory <code>{basedir}</code> and
<code>{PATH-TO-PROJECT}.jar</code>, which is located in <code>${basedir}/target</code> by <a href="https://maven.apache.org/guides/getting-started/">Maven
convention</a>. Then modify the
<code>TOPOLOGY-FILE-NAME</code> and <code>TOPOLOGY-CLASS-NAME</code> for your project:</p>
<pre><code class="hljs css language-bash">$ heron submit <span class="hljs-built_in">local</span> \
  <span class="hljs-variable">${basedir}</span>/target/PATH-TO-PROJECT.jar \
  TOPOLOGY-FILE-NAME \
  TOPOLOGY-CLASS-NAME
</code></pre>
<p>Here's an example submit command using the example topology from the <a href="getting-started-local-single-node">Quick
Start Guide</a> guide:</p>
<pre><code class="hljs css language-bash">$ heron submit <span class="hljs-built_in">local</span> \
  ~/.heron/examples/heron-api-examples.jar \ <span class="hljs-comment"># The path of the topology's jar file</span>
  org.apache.heron.examples.api.ExclamationTopology \ <span class="hljs-comment"># The topology's Java class</span>
  ExclamationTopology <span class="hljs-comment"># The name of the topology</span>
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="next-steps"></a><a href="#next-steps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Next Steps</h3>
<ul>
<li><a href="deployment-overview">Deploy topologies</a> in clustered, scheduler-driven
environments (such as on <a href="schedulers-aurora-cluster">Aurora</a>
and
<a href="schedulers-local">locally</a></li>
<li><a href="heron-architecture">Develop topologies</a> for Heron</li>
</ul>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.4-incubating/getting-started-local-single-node"><span class="arrow-prev">← </span><span>Local (Single Node)</span></a><a class="docs-next button" href="/docs/0.20.4-incubating/getting-started-docker"><span>Heron &amp; Docker</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#step-1-add-heron-dependencies-to-pomxml">Step 1. Add Heron dependencies to  <code>pom.xml</code></a></li><li><a href="#step-2-remove-storm-dependencies-from-pomxml">Step 2. Remove Storm dependencies from <code>pom.xml</code></a></li><li><a href="#step-3-if-needed-remove-the-clojure-plugin-from-pomxml">Step 3 (if needed). Remove the Clojure plugin from <code>pom.xml</code></a></li><li><a href="#step-4-run-maven-commands">Step 4. Run Maven commands</a></li><li><a href="#step-4-optional-launch-your-upgraded-heron-topology">Step 4 (optional). Launch your upgraded Heron topology</a><ul class="toc-headings"><li><a href="#next-steps">Next Steps</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><div class="apache-disclaimer">Apache Heron is an effort undergoing incubation at <a target="_blank" href="https://apache.org/">The Apache Software Foundation (ASF)</a> sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.<br/><br/>Apache®, the names of Apache projects, and the feather logo are either <a rel="external" href="https://www.apache.org/foundation/marks/list/">registered trademarks or trademarks</a> of the Apache Software Foundation in the United States and/or other countries.<br/><br/><div class="copyright-box">Copyright © 2023 the Apache Software Foundation, Apache Heron, Heron, 
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