<!DOCTYPE html><html><head><title>Developing Engines with IntelliJ IDEA</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Developing Engines with IntelliJ IDEA"/><link rel="canonical" href="https://docs.prediction.io/resources/intellij/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-3598c7d7.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script 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hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div id="page-title"><h1>Developing Engines with IntelliJ IDEA</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#prerequisites">Prerequisites</a> </li> <li> <a href="#preparing-intellij-for-engine-development">Preparing IntelliJ for Engine Development</a> </li> <li> <a href="#running-and-debugging-in-intellij-idea">Running and Debugging in IntelliJ IDEA</a> </li> <li> <a href="#loading-a-template-into-intellij-idea">Loading a Template Into Intellij IDEA</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/intellij.html.md.erb"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div id="page-title"><h1>Developing Engines with IntelliJ IDEA</h1></div></div><div class="content"><h2 id='prerequisites' class='header-anchors'>Prerequisites</h2><p>This documentation assumes that you have a fully functional PredictionIO setup. If you have not installed PredictionIO yet, please follow <a href="/install/">these instructions</a>.</p><h2 id='preparing-intellij-for-engine-development' class='header-anchors'>Preparing IntelliJ for Engine Development</h2><h3 id='installing-intellij-scala-plugin' class='header-anchors'>Installing IntelliJ Scala Plugin</h3><p>First of all, you will need to install the <a href="https://plugins.jetbrains.com/plugin/?id=1347">Scala plugin</a> if you have not already done so.</p><p>Go to the <em>Preferences</em> menu item, and look for <em>Plugins</em>. You should see the following screen.</p><p><img alt="IntelliJ Plugins" src="/images/intellij/intelliJ-scala-plugin-09ee074a.png"/></p><p>Click <em>Install JetBrains plugin...</em>, the search for <em>Scala</em>. You should arrive at something similar to the following.</p><p><img alt="Scala Plugin" src="/images/intellij/intellij-scala-plugin-2-592c697f.png"/></p><p>Click the green <em>Install plugin</em> button to install the plugin. Restart IntelliJ IDEA if asked to do so.</p><h3 id='setting-up-the-engine-directory' class='header-anchors'>Setting Up the Engine Directory</h3><div class="alert-message info"><p>It is very important to run at least <code>pio build</code> once in your engine directory so that the project correctly recognizes the version of PredictionIO that you are using. If you upgraded your PredictionIO installation later, you will need to run <code>pio build</code> again in order for the engine to pick up the latest version of PredictionIO.</p></div><p>Create an engine directory from a template. This requires that you install a template that you wish to start from or modify. Follow template <a href="/start/download">install</a> and <a href="/start/deploy">deploy</a> instructions or go through the <a href="/templates/recommendation/quickstart/">Quick Start</a> if you are planning to modify a recommender. Make sure to build, train, and deploy the engine to make sure all is configured properly.</p><p>From IntelliJ IDEA, choose <em>File</em> &gt; <em>New</em> &gt; <em>Project from Existing Sources...</em>. When asked to select a directory to import, browse to the engine directory that you downloaded too and proceed. Make sure you pick <em>Import project from external model</em> &gt; <em>SBT</em>, then proceed to finish.</p><p>You should be able to build the project at this point. To run and debug PredictionIO server, continue on to the rest of the steps.</p><div class="alert-message info"><p>If you are running on OS X, you will need to do the following due to this <a href="http://bit.ly/12Abtvn">known issue</a>.</p></div><p>Edit <code>build.sbt</code> and add the following under <code>libraryDependencies</code></p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="s2">"org.xerial.snappy"</span> % <span class="s2">"snappy-java"</span> % <span class="s2">"1.1.1.7"</span>
</pre></td></tr></tbody></table> </div> <p><img alt="Updating build.sbt" src="/images/intellij/intellij-buildsbt-05cfd141.png"/></p><p>When you are done editing, IntelliJ should either refresh the project automatically or prompt you to refresh.</p><h3 id='dependencies' class='header-anchors'>Dependencies</h3><p>IntelliJ has the annoying tendency to drop some dependencies when you refresh your build.sbt after any changes. To avoid this we put any jars that must be available at runtime into a separate empty module in the project then we make the main engine project depend on this dummy module for runtime classes.</p><p>Right click on the project and click <em>Open Module Settings</em>. In the second modules column hit <strong>+</strong> and create a new Scala module. Name it pio-runtime-jars and add these assemblies under the module dependencies tab and remember to change the scope of the jars to <strong>runtime</strong>:</p> <ul> <li><p> <code>pio-assembly-0.9.6.jar</code></p><p>This JAR can be found inside the <code>assembly</code> or <code>lib</code> directory of your PredictionIO installation directory.</p></li> <li><p> <code>spark-assembly-1.5.2-hadoop2.4.0.jar</code></p><p>This JAR can be found inside the <code>assembly</code> or <code>lib</code> directory of your Apache Spark installation directory.</p></li> </ul> <p><img alt="Create empty module and add dependencies" src="/images/intellij/pio-runtime-jar-deps-3f3c99d9.png"/></p><p>Now make your engine module dependent on the pio-runtime-jars module for scope = runtime. </p><p><img alt="Create empty module and add dependencies" src="/images/intellij/pio-runtime-jars-266e8c1b.png"/></p><h2 id='running-and-debugging-in-intellij-idea' class='header-anchors'>Running and Debugging in IntelliJ IDEA</h2><h3 id='simulating-<code>pio-train</code>' class='header-anchors' >Simulating <code>pio train</code></h3><p>Create a new <em>Run/Debug Configuration</em> by going to <em>Run</em> &gt; <em>Edit Configurations...</em>. Click on the <strong>+</strong> button and select <em>Application</em>. Name it <code>pio train</code> and put in the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
3</pre></td><td class="code"><pre>Main class: io.prediction.workflow.CreateWorkflow
VM options: -Dspark.master<span class="o">=</span><span class="nb">local</span> -Dlog4j.configuration<span class="o">=</span>file:/<span class="k">**</span>replace_with_your_PredictionIO_path<span class="k">**</span>/conf/log4j.properties
Program arguments: --engine-id dummy --engine-version dummy --engine-variant engine.json
</pre></td></tr></tbody></table> </div> <p>Click the <strong>...</strong> button to the right of <em>Environment variables</em>, and paste the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21</pre></td><td class="code"><pre><span class="nv">SPARK_HOME</span><span class="o">=</span>/<span class="k">**</span>reaplce_w_your_spark_binary_path<span class="k">**</span>
<span class="nv">PIO_FS_BASEDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store
<span class="nv">PIO_FS_ENGINESDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store/engines
<span class="nv">PIO_FS_TMPDIR</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">*</span>/.pio_store/tmp
<span class="nv">PIO_STORAGE_REPOSITORIES_METADATA_NAME</span><span class="o">=</span>predictionio_metadata
<span class="nv">PIO_STORAGE_REPOSITORIES_METADATA_SOURCE</span><span class="o">=</span>ELASTICSEARCH
<span class="nv">PIO_STORAGE_REPOSITORIES_MODELDATA_NAME</span><span class="o">=</span>pio_
<span class="nv">PIO_STORAGE_REPOSITORIES_MODELDATA_SOURCE</span><span class="o">=</span>LOCALFS
<span class="nv">PIO_STORAGE_REPOSITORIES_APPDATA_NAME</span><span class="o">=</span>predictionio_appdata
<span class="nv">PIO_STORAGE_REPOSITORIES_APPDATA_SOURCE</span><span class="o">=</span>ELASTICSEARCH
<span class="nv">PIO_STORAGE_REPOSITORIES_EVENTDATA_NAME</span><span class="o">=</span>predictionio_eventdata
<span class="nv">PIO_STORAGE_REPOSITORIES_EVENTDATA_SOURCE</span><span class="o">=</span>HBASE
<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_TYPE</span><span class="o">=</span>elasticsearch
<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_HOSTS</span><span class="o">=</span>localhost
<span class="nv">PIO_STORAGE_SOURCES_ELASTICSEARCH_PORTS</span><span class="o">=</span>9300
<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_TYPE</span><span class="o">=</span>localfs
<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_HOSTS</span><span class="o">=</span>/<span class="k">**</span>replace_w_your_path_to<span class="k">**</span>/.pio_store/models
<span class="nv">PIO_STORAGE_SOURCES_LOCALFS_PORTS</span><span class="o">=</span>0
<span class="nv">PIO_STORAGE_SOURCES_HBASE_TYPE</span><span class="o">=</span>hbase
<span class="nv">PIO_STORAGE_SOURCES_HBASE_HOSTS</span><span class="o">=</span>0
<span class="nv">PIO_STORAGE_SOURCES_HBASE_PORTS</span><span class="o">=</span>0
</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>Remember to replace all paths that start with <code>**replace</code> with actual values. The directory <code>.pio_store</code> typically locates inside your home directory.</p></div><p>The end result should look something similar to this.</p><p><img alt="Run Configuration" src="/images/intellij/intellij-config-48c05039.png"/></p><p>Save and you can run or debug <code>pio train</code> with the new configuration!</p><h3 id='simulating-<code>pio-deploy</code>' class='header-anchors' >Simulating <code>pio deploy</code></h3><p>For <code>pio deploy</code>, simply duplicate the previous configuration and replace with the following.</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2</pre></td><td class="code"><pre>Main class: io.prediction.workflow.CreateServer
Program Arguments: --engineInstanceId <span class="k">**</span>replace_with_the_id_from_pio_train<span class="k">**</span>
</pre></td></tr></tbody></table> </div> <h3 id='executing-a-query' class='header-anchors'>Executing a Query</h3><p>You can execute a query with the correct SDK. For a recommender that has been trained with the sample MovieLens dataset perhaps the easiest query is a curl one. Start by running or debuging your <code>deploy</code> config so the service is waiting for the query. Then go to the &quot;Terminal&quot; tab at the very bottom of the IDEA window and enter the curl request:</p><p><code>$ curl -H &quot;Content-Type: application/json&quot; -d &#39;{ &quot;user&quot;: &quot;1&quot;, &quot;num&quot;: 4 }&#39; http://localhost:8000/queries.json</code></p><p>This should return something like:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
3
4
5
6</pre></td><td class="code"><pre><span class="o">{</span><span class="s2">"itemScores"</span>:[
  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"52"</span>,<span class="s2">"score"</span>:9.582509402541834<span class="o">}</span>,
  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"95"</span>,<span class="s2">"score"</span>:8.017236650368387<span class="o">}</span>,
  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"89"</span>,<span class="s2">"score"</span>:6.975951244053634<span class="o">}</span>,
  <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"34"</span>,<span class="s2">"score"</span>:6.857457277981334<span class="o">}</span>
<span class="o">]}</span>
</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>If you hit a breakpoint you are likely to get a connection timeout. To see the data that would have been returned, just place a breakpoint where the response is created or run the query with no breakpoints.</p></div><h2 id='loading-a-template-into-intellij-idea' class='header-anchors'>Loading a Template Into Intellij IDEA</h2><p>To customize an existing <a href="http://templates.prediction.io">template</a> using Intellij IDEA, first pull it from the template gallery:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio template get &lt;Template Source&gt; &lt;New Engine Directory&gt;
</pre></td></tr></tbody></table> </div> <p>Now, before opening the template with Intellij, run the following command in the new engine template directory</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio build
</pre></td></tr></tbody></table> </div> <p>This should update the pioVersion key in SBT to the version of PredictionIO you have installed, so that Intellij loads the correct JARS via its Auto-Import feature. Now, you can go ahead and open the file <code>build.sbt</code> with Intellij IDEA. You are now ready to <a href="/customize/">customize</a> your new engine template.</p></div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//docs.prediction.io/install/" target="blank">Download</a></li><li><a href="//docs.prediction.io/" target="blank">Docs</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/predictionio" target="blank">Stackoverflow</a></li></ul></div></div><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predictionio.incubator.apache.org/community/contribute-code/" target="blank">Contribute</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">Source Code</a></li><li><a href="//issues.apache.org/jira/browse/PIO" target="blank">Bug Tracker</a></li><li><a href="mailto:dev-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to Development Mailing List</a></li></ul></div></div></div></div><div id="footer-bottom"><div class="container"><div class="row"><div class="col-md-12"><div id="footer-logo-wrapper"><img alt="PredictionIO" src="/images/logos/logo-white-d1e9c6e6.png"/></div><div id="social-icons-wrapper"><a class="github-button" href="https://github.com/apache/incubator-predictionio" data-style="mega" data-count-href="/apache/incubator-predictionio/stargazers" data-count-api="/repos/apache/incubator-predictionio#stargazers_count" data-count-aria-label="# stargazers on GitHub" aria-label="Star apache/incubator-predictionio on GitHub">Star</a> <a class="github-button" href="https://github.com/apache/incubator-predictionio/fork" data-icon="octicon-git-branch" data-style="mega" data-count-href="/apache/incubator-predictionio/network" data-count-api="/repos/apache/incubator-predictionio#forks_count" data-count-aria-label="# forks on GitHub" aria-label="Fork apache/incubator-predictionio on GitHub">Fork</a> <script id="github-bjs" async="" defer="" src="https://buttons.github.io/buttons.js"></script><a href="//www.facebook.com/predictionio" target="blank"><img alt="PredictionIO on Twitter" src="/images/icons/twitter-ea9dc152.png"/></a> <a href="//twitter.com/predictionio" target="blank"><img alt="PredictionIO on Facebook" src="/images/icons/facebook-5c57939c.png"/></a> </div></div></div></div></div></footer></div><script>(function(w,d,t,u,n,s,e){w['SwiftypeObject']=n;w[n]=w[n]||function(){
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