Why Groovy Gr8Conf 2018

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Why use #groovylang? How to convince your boss and others Jenn Strater @codeJENNerator @zenjobcom

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@codeJENNerator Note For Those Viewing Slides Online • Bulleted text like this indicates the key points mentioned on a previous slide. They may not have been included in the ofﬁcial presentation. • Not every slide was in the presentation. There is more content then time so some are skipped at some conferences. • If this view does not support links, the links will work in the pdf. Click the ‘download pdf’ button on the right.

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@codeJENNerator Follow Along https://speakerdeck.com/jlstrater/why-groovy-gr8conf-2018

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Follow Along https://speakerdeck.com/jlstrater/test-driven-docs-springone-2017 https://github.com/jlstrater/groovy-spring-boot-restdocs-example https://github.com/ratpack/example-books https://github.com/jlstrater/spring-restdocs-public-api-example

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@codeJENNerator About Me - Working at Zenjob. - Groovy (mostly Grails) user since 2013. - Before moving to Berlin, I spent a year in Copenhagen. - Before that, I was senior consultant at Object Partners, Inc. in Minneapolis, MN, USA. - Co-founder of Gr8Ladies (deprecated) - Passionate about bring new people into the Groovy community through free introductory workshops called Gr8Workshops and supporting underrepresented minorities and their careers in tech.

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@codeJENNerator Audience Background

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@codeJENNerator Audience Background • Groovy • Everyday user • Side project user • New to Groovy

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@codeJENNerator Audience Background • Groovy • Everyday user • Side project user • New to Groovy

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@codeJENNerator Audience Background • Groovy • Everyday user • Side project user • New to Groovy • Frameworks / Tools • Grails • Spock • Gradle • Griffon • Jenkins

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@codeJENNerator –Andres Almiray @aalmiary “Groovy developers don’t seem to care about hype, they simply get the job done.”

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@codeJENNerator Outline • Why use Groovy? • Truth or Myth? • Ways to Start Using Groovy Today!

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@codeJENNerator Features

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@codeJENNerator Ecosystem

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@codeJENNerator Community

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@codeJENNerator http://bit.ly/groovy-word-cloud

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@codeJENNerator Groovy is awesome because… • Great features • Thriving ecosystem • Friendly community

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@codeJENNerator

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@codeJENNerator Truth or Myth?

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@codeJENNerator • After spending some time at Java User Groups, Conferences, and reading lots of stuff online, I realized that there are a lot of things people get wrong about Groovy or that just aren’t true in the most recent versions. • All of these assumptions are things are related to conversations I’ve had with real people at some point in my career.

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@codeJENNerator Groovy is the same thing as Grails

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@codeJENNerator • Groovy is a language and can be used independently or in many different frameworks including: • Grails • Griffon • Gaelyk • Spock • Ratpack • Vertx • And many more!

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@codeJENNerator Groovy is just a scripting language

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@codeJENNerator Yes and No

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@codeJENNerator • Groovy CAN BE used for scripting, but it’s NOT ONLY a scripting language. It can also be used in OOP and functional projects too.

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@codeJENNerator James Strachan, the creator of Groovy, has left the community

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@codeJENNerator James Strachan, the creator of Groovy, has left the community

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@codeJENNerator • 2009 http://macstrac.blogspot.de/2009/04/scala-as-long- term-replacement-for.html • 2017 https://medium.com/@jstrachan/fwiw-i-still-use- groovy-most-days-thanks-to-jenkins-pipelines-along-with- java-typescript-ef5f8b05acbe

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@codeJENNerator 4. Groovy’s dynamic nature can mean more runtime errors

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@codeJENNerator

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@codeJENNerator But…

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@codeJENNerator

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@codeJENNerator • We protect against runtime errors with good practices like static analysis tools (think Codenarc), code reviews, writing comprehensive tests, and learning about common pitfalls and mistakes made in Groovy (like reading blogs and going to conferences) • Moving execution of code to runtime isn’t always bad, sometimes adding null-safes can protect against NPEs.

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From Iván Lopez’s “ I've seen Grails code you wouldn't believe…” at Greach 2018 Slides

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@codeJENNerator Groovy is a dynamically typed language

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@codeJENNerator Not really

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@codeJENNerator • Groovy is OPTIONALLY typed. Def can be used when a type is ﬂexible, but unlike some other languages, declaring def x = 3 followed by x = ‘hello’ is totally valid Groovy. • Also, using static compilation (vs the default dynamic compilation) makes a difference in what behaviors are allowed. • Groovy is called dynamic language not because of typing but because of the dynamic features including runtime metaprogramming. • For a really good explanation of the Groovy type system, read Groovy in Action 2nd Edition!

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@codeJENNerator Groovy is not suitable for production apps

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@codeJENNerator Not really

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@codeJENNerator Groovy is slow

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@codeJENNerator It depends!

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@codeJENNerator • It’s true that Groovy is slower than optimal Java, but not by as much as most people think.

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@codeJENNerator • It mainly depends on what you write. For example, some improperly used looping methods may be slower than the Java counterpart. • Compilation also matters. Statically compiled Groovy code can run almost as fast as well-written Java code. However, dynamic Groovy isn’t that much slower (if written with performance in mind). • Consider reading https://www.linkedin.com/pulse/ how-make-groovy-fast-java-david-e-jones/ for more info.

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@codeJENNerator 8. Gradle is switching to Kotlin because Groovy sucks.

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@codeJENNerator • Gradle needed some major reworking. Not because of Groovy itself but because of how they implemented the DSL (hindsight is always 20/20!) • Kotlin solves issues that many end users (especially Android devs) have with Gradle including poor IntelliJ support and the fact that many people don’t know Groovy. I’ve seen so many people use it without really knowing the best practices resulting in horrible builds. That’s not really the fault of Groovy or Gradle, but . • Gradle could have been reworked to support Groovy better, but for now, Kotlin makes more sense. • Also, Groovy support is not going away! Kotlin is just being added (with maybe some extra enhancements). • Mostly from my own experience and http://melix.github.io/blog/2016/05/ gradle-kotlin.html

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@codeJENNerator You can write a project entirely in statically compiled Groovy

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@codeJENNerator • If you find yourself forgetting to add @CompileStatic at the top of every file in your groovy code, you can set compiler options using Gradle and it will apply static compilation to every file in your source directory. • https://stackoverflow.com/a/30307025/2250125

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@codeJENNerator Grails is Rails for the JVM

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@codeJENNerator • Although Grails originally started as a Rails like MVC framework for the JVM, it has since very much diverged from Ruby on Rails. Grails is not just for monoliths but the proﬁle system can be used for many different types of applications. Grails 3.0 is also heavy reliant on Spring Boot and goes even further in that direction.

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@codeJENNerator Groovy is dead

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@codeJENNerator

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@codeJENNerator Groovy Downloads in Thousands 0 1500 3000 4500 6000 January 2012 July 2012 January 2013 July 2013 January 2014 July 2014 January 2015 July 2015 January 2016 July 2016 January 2017 July 2017 Codehaus Bintray Maven Central

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source: bintray

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source: bintray

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@codeJENNerator • Groovy downloads are up and higher than any time under Pivotal • In the last few years under Apache, Groovy has added many new contributors from various companies and individuals all over the world. • Although there is no single company is sponsoring the language, companies like OCI sponsor developers at least part-time.

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@codeJENNerator • Groovy releases are more frequent than in a long time. • Improvements coming in 2.5 including macros and 2.6/3.0 with the parrot parser will majorly change Groovy for the better. Most of the work on the parrot parser comes from a new committer, Daniel Sun! • OCI’s support of the Grails framework means several people are dedicated to it and releases are frankly coming out faster than I can keep up.

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@codeJENNerator use code ctwgr8eu18

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@codeJENNerator

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@codeJENNerator Adding Groovy to your organization

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@codeJENNerator See if you are already using Groovy • Jenkins (Pipeline, Jobs Plugin, and many more!) • Spring Boot (optional Groovy support) • Apache Spark • SoapUI • JMeter • Tinkerpop (Gremlin) • Oracle NoSQL Database • Elasticsearch (deprecated)

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@codeJENNerator Spock • Groovy can be used in tests, but not in the end product if you don’t need it. • Once you start using Spock, you can add other awesome tools like Get and Test Containers

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@codeJENNerator Try a small POC • Frameworks like Grails are great for trying something out. If the team gets used to using Groovy for small projects, it might be easier to use it in more places later.

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@codeJENNerator Get Connected • Subscribe to the groovy users mailing list • Join the Groovy Community on Slack groovycommunity.com or sign-in again at groovycommunity.slack.com • Contribute by writing documentation or ﬁxing bugs. • Attend conferences like GR8Conf EU 2018. • Join Zenjob!

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@codeJENNerator Conclusion

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@codeJENNerator

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@codeJENNerator • Groovy is a fun language with a great community!

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@codeJENNerator • Groovy is a fun language with a great community! • You can use Groovy in many different ways!

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@codeJENNerator • Groovy is a fun language with a great community! • You can use Groovy in many different ways! • It isn’t an all-or-nothing solution. You can start small.

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@codeJENNerator • Groovy is a fun language with a great community! • You can use Groovy in many different ways! • It isn’t an all-or-nothing solution. You can start small. • Start talking about Groovy with your boss and coworkers and make sure they don’t keep spreading the Groovy myths. Keep them on the Groovy truth.

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@codeJENNerator Feedback • Rate this talk: https://gr8conf.eu/talks • Send me new Groovy Truth of Myths

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@codeJENNerator Questions? https://ﬂic.kr/p/5DeuzB