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| </div><div id='content' class='page-1'><div class='row'><div class='row-fluid'><div class='col-lg-3'><ul class='nav-sidebar'><li><a href='./'>Blog index</a></li><li class='active'><a href='#doc'>Community Over Code (Europe) 2024</a></li><li><a href='#_the_conference_venue_and_host_city' class='anchor-link'>The Conference, Venue, and Host city</a></li><li><a href='#_highlights_from_the_groovy_bof_and_groovy_track' class='anchor-link'>Highlights from the Groovy BoF and Groovy Track</a></li><li><a href='#_posters' class='anchor-link'>Posters</a></li><li><a href='#_other_information' class='anchor-link'>Other information</a></li></ul><br/><ul class='nav-sidebar'><li style='padding: 0.35em 0.625em; background-color: #eee'><span>Related posts</span></li><li><a href='./community-over-code-na-2023'>Community Over Code (North America) 2023</a></li><li><a href='./apache-groovy-2022-year-in'>Apache Groovy 2022 Year In Review</a></li></ul></div><div class='col-lg-8 col-lg-pull-0'><a name='doc'></a><h1>Community Over Code (Europe) 2024</h1><p><span>Author: <i>Paul King</i></span><br/><span>Published: 2024-06-17 05:00PM</span></p><hr/><div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This year’s European edition of the ASF conference, <a href="https://eu.communityovercode.org">Community Over Code EU</a>, |
| featured three in-person days of sessions (June 3-5) in Bratislava, Slovakia, including a Groovy track on the last day.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| The presentation slides and audio/video (where available) are still being added onto the conference site. |
| If additional material becomes available, this post will be updated with links to the additional content. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>This post gives a short trip report on the conference mostly focussed on the Groovy track.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_the_conference_venue_and_host_city">The Conference, Venue, and Host city</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The conference was hosted at the Radisson Blu Carlton in Bratislava, Slovakia. The facilities were great, |
| and it was a great city to visit.</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="image"><img src="https://eu.communityovercode.org/images/blog/images-bratislava1.jpg" alt="images bratislava1" width="47%"></span> |
| <span class="image"><img src="https://photos.apachecon.com/_data/i/upload/2024/06/05/20240605134031-d3953d86-xx.jpg" alt="20240605134031 d3953d86 xx" width="42%"></span> |
| <span class="image"><img src="https://photos.apachecon.com/_data/i/upload/2024/06/10/20240610202025-1ac29b1e-xx.jpg" alt="20240610202025 1ac29b1e xx" width="44.4%"></span> |
| <span class="image"><img src="https://photos.apachecon.com/_data/i/upload/2024/06/05/20240605081228-926eecf0-xx.jpg" alt="20240605081228 926eecf0 xx" width="44.4%"></span> |
| <span class="image"><img src="img/coceu2024_tac_dinner.jpg" alt="coceu2024 tac dinner" width="55%"></span> |
| <span class="image"><img src="https://photos.apachecon.com/_data/i/upload/2023/10/20/20231020033313-d56c0136-me.jpg" alt="stickers" width="33%"></span></p> |
| </div> |
| <div class="paragraph"> |
| <p>Kudos to all involved for making the event a fruitful and rewarding one!</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_highlights_from_the_groovy_bof_and_groovy_track">Highlights from the Groovy BoF and Groovy Track</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>We had a very engaging Birds-of-a-Feather (BoF) session with various users of the |
| Groovy programming language including a large contingent from the <a href="https://ofbiz.apache.org/">Apache OFBiz</a> |
| project. We also discussed some of the reasons why Groovy is still a compelling |
| language choice in 2024.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_why_use_groovy_in_2024">Why use Groovy in 2024?</h3> |
| <div class="paragraph"> |
| <p>This talk looked at some of the compelling reasons for using Groovy today.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a href="https://speakerdeck.com/paulk/groovy-today"><span class="image"><img src="img/coceu2024_why_groovy.png" alt="first slide of slide deck"></span></a> |
| <a href="https://speakerdeck.com/paulk/groovy-today">Why use Groovy in 2024?</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Some highlights:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Groovy’s 80+ AST transforms allow you to write concise declarative style code. |
| As one example, here’s an example of a deeply immutable <code>Book</code> class with |
| additional generated code for comparators (sorting), custom serialization and deserialization, |
| and some special JavaBean index handling code:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_transforms.png" alt="AST transform example"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Groovy’s 2000+ extension methods enrich the Java class libraries with additional |
| functionality. As one example, primitive array extensions speed up certain operations |
| where you might otherwise use streams:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_primitives.png" alt="performance of primitive int array extension methods"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Groovy’s operator overloading and extensible tooling greatly simplifies |
| use of the libraries and APIs that Java programmers are familiar with. |
| Here’s an example of using Apache Commons Math:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_operator_overloading.png" alt="matrix example"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Groovy has excellent scripting and domain specific language (DSL) support. As one example, |
| in about 10 lines of code, you can write a statically-typed DSL for working with Roman |
| numerals. Once the DSL is defined, you can use it in scripts like this:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="prettyprint highlight"><code data-lang="groovy">assert [LVII + LVII, V * III, V ** II, IV..(V+I), [X, V, I].sort()] |
| == [ cxiv, xv, xxv, iv..vi, [i, v, x] ]</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Invalid roman numerals are detected at compile-time:</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_static_roman_numerals.png" alt="error" width="80%"></span></p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Check out the <a href="https://speakerdeck.com/paulk/groovy-today">slide deck</a> for more information.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_classifying_iris_flowers_with_groovy_deep_learning_and_graalvm">Classifying Iris flowers with Groovy, Deep Learning, and GraalVM</h3> |
| <div class="paragraph"> |
| <p>This talk looked at the machine language problem of classification using a classic Iris flowers dataset.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a href="https://speakerdeck.com/paulk/groovy-iris"><span class="image"><img src="img/coceu2024_iris.png" alt="cover slide for slide deck"></span></a> |
| <a href="https://speakerdeck.com/paulk/groovy-iris">Classifying Iris flowers with Groovy, Deep Learning, and GraalVM</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Highlights:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Classification predicts the class of something using models trained |
| on measured features given a known class:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris1.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The case study uses a well-known Iris dataset. |
| The measured features are sepal width and length, and petal width and length:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris2.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>First, a number of classic algorithms for doing classification were examined |
| including the Naïve Bayes algorithm, here using the Weka data science library:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris3.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Then neural networks are explained. A potential network for the case study |
| is shown here:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris4.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Each node acts like a neuron in the human brain: |
| <span class="image"><img src="img/coceu2024_iris5.png" alt="classifiation" width="80%"></span></p> |
| </li> |
| <li> |
| <p>Several libraries for deep learning were discussed including Deep Netts:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris6.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Compiling the script using the Groovy compiler with the <code>--compile-static</code> switch and |
| then using GraalVM to build a native image gave a more than 10 times speed increase:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_iris7.png" alt="classifiation" width="80%"></span></p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Check out the <a href="https://speakerdeck.com/paulk/groovy-iris">slide deck</a> for more information.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_getting_started_with_the_micronaut_framework">Getting Started with the Micronaut Framework</h3> |
| <div class="paragraph"> |
| <p><a href="https://sergiodelamo.com/">Sergio del Amo</a> gave a talk on |
| <a href="https://speakerdeck.com/sdelamo/getting-started-with-the-micronaut-framework">Getting Started with the Micronaut Framework</a>, in particular |
| its support for using Groovy when building microservices. |
| <a href="https://speakerdeck.com/sdelamo/getting-started-with-the-micronaut-framework"><span class="image"><img src="img/coceu2024_micronaut.png" alt="slide deck first slide"></span></a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Highlights:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The speed of Micronaut applications comes from its ahead-of-time approach:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut1.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Micronaut supports a range of runtimes:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut2.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Micronaut supports a range of messaging technologies:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut3.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Micronaut supports a range of persistence technologies:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut4.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Micronaut supports a range of view technologies:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut5.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>You can create Microservices applications using Micronaut launch:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_micronaut_groovy_spock.png" alt="Using Micronaut Launch"></span></p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Check out the <a href="https://speakerdeck.com/sdelamo/getting-started-with-the-micronaut-framework">slide deck</a> for more information.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_whiskey_clustering_with_apache_projectsgroovy_commons_csv_commons_math_ignite_spark_wayang_beam_and_flink">Whiskey Clustering with Apache Projects:Groovy, Commons CSV, Commons Math, Ignite, Spark, Wayang, Beam, and Flink</h3> |
| <div class="paragraph"> |
| <p>This talk looked at the machine language problem of clustering using a well-known whiskey flavor profiles dataset.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a href="https://speakerdeck.com/paulk/groovy-whiskey"><span class="image"><img src="img/coceu2024_whiskey.png" alt="cover slide for slide deck"></span></a> |
| <a href="https://speakerdeck.com/paulk/groovy-whiskey">Whiskey Clustering with Apache Projects:Groovy, Commons CSV, Commons Math, Ignite, Spark, Wayang, Beam, & Flink</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Highlights:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The case study looked at how to cluster 86 single malt scotch whiskies based on rankings of 12 flavor categories:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/Clustering0.png" alt="Whiskey flavour profiles"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>There are different algorithms that can be used to do the clustering. |
| K-Means clustering was the key algorithm covered:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/Clustering1.png" alt="The k-means algorithm"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The talk covers using vanilla data science libraries |
| including Apache Commons Math to solve this problem, then looks at |
| how you might scale up the problem using a range of Apache technologies. |
| The first technology considered was Apache Ignite. First we read in the data:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/Clustering2.png" alt="Whiskey flavour profiles"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Then we use Ignite’s distributed clustering libraries to find the centroids:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/Clustering3.png" alt="Whiskey flavour profiles"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>Various options to tweak the algorithm and various |
| ways to visualize the results were examined:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/Clustering4.png" alt="Whiskey flavour profiles with Ignite"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The same case study was also done using Spark:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_whiskey1.png" alt="Whiskey flavour profiles with Spark"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The same case study was also done using Wayang:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_whiskey2.png" alt="Whiskey flavour profiles with Wayang"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The same case study was also done using Beam (Python-style version shown here):</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_whiskey3.png" alt="Whiskey flavour profiles with Beam"></span></p> |
| </div> |
| </li> |
| <li> |
| <p>The same case study was also done using Flink:</p> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_whiskey4.png" alt="Whiskey flavour profiles with Flink"></span></p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_posters">Posters</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Community over Code EU also featured a dedicated area for poster sessions. |
| Corridor conversations are a key part of any ASF conference. |
| The posters provided a complimentary way to trigger conversations |
| as well as to learn about a range of topics if the folks who might know |
| all about those topics aren’t in the corridor at the same time as you.</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/coceu2024_posters.jpg" alt="Posters" width="51%"></span> |
| <a href="https://github.com/apache/apachecon-eu/blob/main/static/posters/CoCEU_WhyGroovyToday.pdf"><span class="image"><img src="img/coceu2024_groovy_poster.jpg" alt="Why use Groovy in 2024? Poster" width="35%"></span></a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Check out the Groovy <a href="https://github.com/apache/apachecon-eu/blob/main/static/posters/CoCEU_WhyGroovyToday.pdf">poster</a>!</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_other_information">Other information</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>See also:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="https://photos.apachecon.com/index.php?/category/38">Additional photos</a> (may be added to over time).</p> |
| </li> |
| <li> |
| <p><a href="https://eu.communityovercode.org/program/">The official program</a> includes all tracks and will include |
| links to the slides of the talks if/when available.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Other trip reports:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="https://www.linkedin.com/pulse/fourth-community-over-code-performance-engineering-track-paul-brebner-i1vlc/">Performance Engineering Track</a></p> |
| </li> |
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