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href="/algorithm/multiple/"><span>Combining Multiple
Algorithms</span></a></li><li class="level-2"><a class="final"
href="/algorithm/custom/"><span>Adding Your Own
Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible"
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class="final" href="/evaluation/"><span>Overview</span></a></li><li
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etricchoose/"><span>Choosing Evaluation Metrics</span></a></li><li
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Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a
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mmendation/batch-evaluator/"><span>Batch Persistable
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for Users</span></a></li><li class="level-3"><a class="final"
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Users</span></a></li></ul></li><li class="level-2"><a class="expandible"
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sification</span></a><ul><li class="level-3"><a class="final"
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class="level-3"><a class="final"
href="/templates/classification/add-algorithm/"><span>Use Alternative
Algorithm</span></a></li><li class="level-3"><a class="final"
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Properties</span></a></li></ul></li></ul></li><li class="level-1"><a
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lass="final" href="/community/projects/"><span>Community
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IDEA</span></a></li><li class="level-2"><a class="final"
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ass="expandible" href="#"><span>Apache Software Foundation</span></a><ul><li
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hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a
href="#">Resources</a><span class="spacer">></span></li><li><span
class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div
id="page-title"><h1>Developing Engines with I
ntelliJ 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> </ul> </aside><hr/><a id="edit-page-link"
href="https://github.com/apache/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
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class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span
class="spacer">></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='h
eader-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><p>The
following instructions have been tested with IntelliJ IDEA 2018.2.2 Community
Edition.</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-43ad9eb2.png"/></p><p>Click
<em>Install JetBrains plugin...</em>, the search for <em>Scala</em>. You should
arr
ive at something similar to the following.</p><p><img alt="Scala Plugin"
src="/images/intellij/intellij-scala-plugin-2-0edbef71.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><p>Create an engine
directory from a template. This requires that you download a template that you
wish to start from or modify.</p><p>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> > <em>New</em> > <em>Project from Existing
Sources...</em>. When asked to select a directory to import, browse to the
engine direct
ory that you downloaded too and proceed. Make sure you pick <em>Import project
from external model</em> > <em>SBT</em>, then proceed to finish.</p><p>You
should be able to build the project at this point. To run and debug your
template, continue on to the rest of the steps.</p><h3
id='optional:-issues-with-snappy-on-macos' class='header-anchors'>Optional:
Issues with Snappy on macOS</h3><p>If you are running on macOS and run into the
following <a href="http://bit.ly/12Abtvn";>known issue</a>, follow steps in this
section.</p><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>
+<!DOCTYPE html><html><head><title>Developing Engines with IntelliJ
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PredictionIO" id="logo"
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with IntelliJ IDEA</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO
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id="nav-main"><ul><li class="level-1"><a class="expandible"
href="/"><span>Apache PredictionIO® Documentation</span></a><ul><li
class="level-2"><a class="final" href="/"><span>Welcome to Apache
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class="final" href="/datacollection/"><span>Event Server
Overview</span></a></li><li class="level-2"><a class="final"
href="/datacollection/eventapi/"><span>Collecting Data with
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s="expandible" href="#"><span>Choosing an Algorithm</span></a><ul><li
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Libraries</span></a></li><li class="level-2"><a class="final"
href="/algorithm/switch/"><span>Switching to Another
Algorithm</span></a></li><li class="level-2"><a class="final"
href="/algorithm/multiple/"><span>Combining Multiple
Algorithms</span></a></li><li class="level-2"><a class="final"
href="/algorithm/custom/"><span>Adding Your Own
Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible"
href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a
class="final" href="/evaluation/"><span>Overview</span></a></li><li
class="level-2"><a class="final"
href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li
class="level-2"><a class="final"
href="/evaluation/evaluationdashboard/"><span>Evaluation
Dashboard</span></a></li><li class="level-2"><a class="final"
href="/evaluation/metr
icchoose/"><span>Choosing Evaluation Metrics</span></a></li><li
class="level-2"><a class="final" href="/evaluation/metricbuild/"><span>Building
Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a
class="expandible" href="#"><span>System Architecture</span></a><ul><li
class="level-2"><a class="final" href="/system/"><span>Architecture
Overview</span></a></li><li class="level-2"><a class="final"
href="/system/anotherdatastore/"><span>Using Another Data
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href="#"><span>PredictionIO® Official Templates</span></a><ul><li
class="level-2"><a class="final"
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class="expandible" href="#"><span>Recommendation</span></a><ul><li
class="level-3"><a class="final"
href="/templates/recommendation/quickstart/"><span>Quick
Start</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/dase/"><span>DASE</span></a></li><li c
lass="level-3"><a class="final"
href="/templates/recommendation/evaluation/"><span>Evaluation
Explained</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/how-to/"><span>How-To</span></a></li><li
class="level-3"><a class="final"
href="/templates/recommendation/reading-custom-events/"><span>Read Custom
Events</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/customize-data-prep/"><span>Customize Data
Preparator</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/customize-serving/"><span>Customize
Serving</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/training-with-implicit-preference/"><span>Train
with Implicit Preference</span></a></li><li class="level-3"><a class="final"
href="/templates/recommendation/blacklist-items/"><span>Filter Recommended
Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final"
href="/templates/recomme
ndation/batch-evaluator/"><span>Batch Persistable
Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible"
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a
class="final" href="/templates/ecommercerecommendation/quickstart/"><span>Quick
Start</span></a></li><li class="level-3"><a class="final"
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li
class="level-3"><a class="final"
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
class="level-3"><a class="final"
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train
with Rate Event</span></a></li><li class="level-3"><a class="final"
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust
Score</span></a></li></ul></li><li class="level-2"><a class="expandible"
href="#"><span>Similar Product</span></a><ul><li class="level-3"><a
class="final" href="/templates/similarproduct/quickstart/"><span>Quick St
art</span></a></li><li class="level-3"><a class="final"
href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li
class="level-3"><a class="final"
href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li
class="level-3"><a class="final"
href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple
Events and Multiple Algorithms</span></a></li><li class="level-3"><a
class="final"
href="/templates/similarproduct/return-item-properties/"><span>Returns Item
Properties</span></a></li><li class="level-3"><a class="final"
href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate
Event</span></a></li><li class="level-3"><a class="final"
href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events
for Users</span></a></li><li class="level-3"><a class="final"
href="/templates/similarproduct/recommended-user/"><span>Recommend
Users</span></a></li></ul></li><li class="level-2"><a class="expandible"
href="#"><span>Classif
ication</span></a><ul><li class="level-3"><a class="final"
href="/templates/classification/quickstart/"><span>Quick
Start</span></a></li><li class="level-3"><a class="final"
href="/templates/classification/dase/"><span>DASE</span></a></li><li
class="level-3"><a class="final"
href="/templates/classification/how-to/"><span>How-To</span></a></li><li
class="level-3"><a class="final"
href="/templates/classification/add-algorithm/"><span>Use Alternative
Algorithm</span></a></li><li class="level-3"><a class="final"
href="/templates/classification/reading-custom-properties/"><span>Read Custom
Properties</span></a></li></ul></li></ul></li><li class="level-1"><a
class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li
class="level-2"><a class="final"
href="/gallery/template-gallery/"><span>Browse</span></a></li><li
class="level-2"><a class="final"
href="/community/submit-template/"><span>Submit your Engine as a
Template</span></a></li></ul></li><li class="level-1"><a class=
"expandible" href="#"><span>Demo Tutorials</span></a><ul><li
class="level-2"><a class="final" href="/demo/tapster/"><span>Comics
Recommendation Demo</span></a></li><li class="level-2"><a class="final"
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class="level-2"><a class="final" href="/demo/textclassification/"><span>Text
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class="col-md-9 col-sm-12"><div class="content-header hidden-md
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a
href="#">Resources</a><span class="spacer">></span></li><li><span
class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div
id="page-title"><h1>Developing Engines with Inte
lliJ 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> </ul> </aside><hr/><a id="edit-page-link"
href="https://github.com/apache/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">></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='head
er-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><p>The
following instructions have been tested with IntelliJ IDEA 2018.2.2 Community
Edition.</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-43ad9eb2.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-2-0edbef71.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><p>Create an engine
directory from a template. This requires that you download a template that you
wish to start from or modify.</p><p>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> > <em>New</em> > <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> > <em>SBT</em>, then proceed to finish.</p><p>You
should be able to build the project at this point. To run and debug your
template, continue on to the rest of the steps.</p><h3
id='optional:-issues-with-snappy-on-macos' class='header-anchors'>Optional:
Issues with Snappy on macOS</h3><p>If you are running on macOS and run into the
following <a href="http://bit.ly/12Abtvn";>known issue</a>, follow steps in this
section.</p><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 prompt you to import new changes, unless you have
already enabled auto import. Import this change to make it effective.</p><h3
id='module-settings' class='header-anchors'>Module Settings</h3><div
class="alert-message info"><p>IntelliJ will recreate module settings whenever
it imports changes of your project. You will need to repeat this section
whenever that happens.</p></div><p>Due to the way how <code>pio</code> command
sources required classes during runtime, it is necessary to add them manually
in module settings for <em>Run/Debug Configurations</em> to work
properly.</p><p>Right click on the project and click <em>Open Module
Settings</em>. Hit the <strong>+</strong> button right below the list of
dependencies, and select <em>JARs or directories...</em>.</p><p>The first JAR
that you need to add is the <c
ode>pio-assembly-0.12.1.jar</code> that contains all necessary classes. It can
be found inside the <code>dist/lib</code> directory of your PredictionIO source
installation directory (if you have built from sources) or the <code>lib</code>
directory of your PredictionIO binary installation directory.</p><p>Next, you
will need to make sure some configuration files from your PredictionIO
installation can be found during runtime. Add the <code>conf</code> directory
of your PredictionIO installation directory. When asked about categories of the
directory, pick <em>Classes</em>.</p><p>Finally, you will need to add storage
classes. The exact list of JARs that you will need to add depends on your
storage configuration. These JARs can be found inside the
<code>dist/lib/spark</code> directory of your PredictionIO source installation
directory (if you have built from sources) or the <code>lib/spark</code>
directory of your PredictionIO binary installation directory.</p> <ul> <li><p>
<code>pio-
data-elasticsearch-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses Elasticsearch.</p></li> <li><p>
<code>pio-data-hbase-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses Apache HBase.</p></li> <li><p>
<code>pio-data-hdfs-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses HDFS.</p></li> <li><p>
<code>pio-data-jdbc-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses JDBC. Notice that you must also add any additional JDBC
driver JARs.</p></li> <li><p>
<code>pio-data-localfs-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses local filesystem.</p></li> <li><p>
<code>pio-data-s3-assembly-0.12.1.jar</code></p><p>Add this JAR if your
configuration uses Amazon Web Services S3.</p></li> </ul> <p>Make sure to
change all these additions to <em>Runtime</em> scope. The following shows an
example that uses the JDBC storage backend with PostgreSQL driver.</p><p><img
alt="Example module s
ettings for a JDBC and PostgreSQL configuration"
src="/images/intellij/intellij-module-settings-fb88b688.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> > <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> <ul> <li><p> Main class:</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>org.apache.predictionio.workflow.CreateWorkflow
</pre></td></tr></tbody></table> </div></li> <li><p> VM options:</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>-Dspark.master<span class="o">=</span><span
class="nb">local</span> -Dlog4j.configuration<span
class="o">=</span>file:/<your_pio_path>/conf/log4j.properties
-Dpio.log.dir<span class="o">=</span><path_of_log_file>
</pre></td></tr></tbody></table> </div></li> <li><p> Program
arguments:</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>--engine-id dummy
--engine-version dummy --engine-variant engine.json --env <span
class="nv">dummy</span><span class="o">=</span>dummy
@@ -16,7 +16,7 @@
<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></div></div></div></div><footer><div
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