Java.il - Confessions of a java developer that fell in love with the groovy language

Confessions of a Java developer

that fell in love with the Groovy language

Victor Trakhtenberg

[email protected] @victortr75

Personal

My name is Victor

Personal

Java.IL community co-‐founder

h=p://www.meetup.com/JavaIL/

Personal

Full Stack Engineer @

h@p://commercesciences.com/jobs

It is NOT an introducFon to Groovy

It is NOT “why you should not use Java”

It is NOT “why you must use

Groovy”

It is “why every Java developer

SHOULD KNOW Groovy”

Groovy is very easy to enter into for Java developers,

since…

Java code is Groovy code

Groovy Features

•  Strings •  CollecFons •  Date •  Parsing and producing JSON

•  Working with a DB •  Processing XML •  Template engines

•  Builders •  Grapes •  Traits •  Processing configuraFon

•  HTTPBuilder •  and many more…

Groovy is more than just a set of features,

it is more than a be=er Java

There are new concepts for Java developers

•  Dynamic language •  with opFonal staFc-‐typing and staFc-‐compilaFon

•  Closures •  FuncFonal programming •  Meta-‐programming •  Traits •  DSLs •  and more…

Using Groovy

Raise your hands

Using Java

Using Ruby,Python, Scala etc.

Prelude -‐ REPL

Groovy CollecFons

Map with default

h=p://groovy-‐the-‐superb-‐homeless.mally.pl/

Using Groovy in a running Java project

Our setup: Java Play! Framework project

Choose one concern to use Groovy

Our choice: JSON manipulaFons

Parse JSON

Build JSON

Case Study: Campaign ConfiguraFon Management

The Java interface and the Groovy implementaFon

Java-‐to-‐Groovy Bridge

Fetch campaign type

Is it a ‘coupon’ campaign

Integrate with Salesforce

Update account at Salesforce

Integrate with Salesforce -‐ AuthenFcate

URIBuilder

URIBuilder -‐ Java

Challenges

•  Java <-‐> Groovy bridge – The need for the Java interface

•  IDE support – Browsing Java code – Groovy code

•  Long stack traces –  challenging debugging

•  Coding convenFons

Use Groovy for non-‐producFon

Groovy in light of Java8

•  There is sFll a gap between Java 8 and Groovy •  There is a synergy between Groovy and Java 8

h=p://www.slideshare.net/SpringCentral/groovy-‐in-‐thelightoaava8 h=p://www.javacodegeeks.com/2014/06/java-‐8-‐lambdas-‐vs-‐groovy-‐closures-‐compactness-‐grouping-‐and-‐summing.html

Groovy in light of Java8 •  Groovy syntax is more compact •  JDK classes enhancements (String, URL, File etc.) •  Operator overloading •  MemoizaFon + trampoliningRegular expressions •  SQL handling •  Coercion of types to Boolean •  JSN + XML parsing and producing •  Traits •  AST transformaFons •  DSL •  …

h=p://jaxenter.com/groovy-‐is-‐the-‐swin-‐alternaFve-‐for-‐android-‐107846.html

Groovy resources •  h=p://groovy-‐lang.org/ •  h=p://glaforge.appspot.com/category/Groovy%20Weekly •  h=p://www.mrhaki.com/ •  h=ps://plus.google.com/communiFes/105160926044623621768 •  h=p://www.mscharhag.com/2015/02/creaFng-‐android-‐apps-‐with-‐

groovy.html •  h=p://groovy.codehaus.org/modules/h=p-‐builder/doc/uribuilder.html •  h=p://www.drdobbs.com/jvm/why-‐build-‐your-‐java-‐projects-‐with-‐

gradle/240168608?pgno=3 •  h=p://www.infoq.com/presentaFons/groovy-‐test-‐java-‐spock •  h=p://www.infoq.com/presentaFons/tesFng-‐spock-‐geb •  h=p://melix.github.io/blog/2015/02/who-‐is-‐groovy.html •  h=p://groovy-‐the-‐superb-‐homeless.mally.pl/#/ •  h=ps://github.com/victorgit/GroovyPresentaFon

MrHaki – Groovy Goodness

h=p://mrhaki.blogspot.co.il/2009/09/groovy-‐goodness-‐padding-‐strings.html

Groovy Challenge!

Save the date: 31-‐May

h=p://www.meetup.com/WeCode-‐IL/

Images sources •  h=p://www.clevercuFes.com/myimages/products/Computers/IHEARTPROGRAMMING.jpg •  h=p://blogs.percepFonsystem.com/wp-‐content/uploads/2013/12/Happy-‐Customer.jpg •  h=p://lifepale=e.com/wp-‐content/uploads/2015/01/ProducFvity.jpg •  h=p://www.checkacFon.com/blog/wp-‐content/uploads/2014/01/startup-‐employee-‐producFvity-‐Fps-‐675x320.jpg •  h=p://www.akifarslan.com.tr/wp-‐content/uploads/2013/10/java.jpg •  h=p://cdn.makeuseof.com/wp-‐content/uploads/2012/03/jvm.png?84ec63 •  h=p://cdn.slidesharecdn.com/ss_thumbnails/ecosystem-‐120717081103-‐phpapp01-‐thumbnail-‐4.jpg?cb=1342530724 •  h=p://www.army-‐armee.forces.gc.ca/assets/ARMY_Internet/images/ceremonial-‐guard/index-‐main.jpg •  h=p://www.local-‐guru.net/img/guru/have_fun.png •  h=p://blog.xo.com/wp-‐content/uploads/2014/03/pic-‐raised-‐hands-‐550x300.png •  h=ps://pbs.twimg.com/media/BVDKBfUCIAAWKw9.jpg •  h=p://www.nscsd.org/webpages/jenkondrk/imageGallery/Clip%20art/raise%20hand.gif •  h=p://ubik.cc/MAOW-‐Firenze-‐09/images/repl-‐loop.png •  h=p://hirportal.sikerado.hu/images/kep/201110/belyeg.jpg •  h=p://www.slideshare.net/SpringCentral/groovy-‐in-‐thelightoaava8 •  h=p://blog.cacoethes.co.uk/groovyandgrails/groovy-‐in-‐light-‐of-‐java-‐8 •  h=p://www.infoq.com/arFcles/groovy-‐to-‐Java-‐8 •  h=ps://tedvinke.wordpress.com/2014/06/20/java-‐8-‐lambdas-‐vs-‐groovy-‐closures-‐compactness-‐grouping-‐and-‐summing/ •  h=p://groovy.mn/staFc/hh97hMrFEv8Xc9j1zvR9winGH86xmHGbiZNKFTORWYl.jpg

Java.il - Confessions of a java developer that fell in love with the groovy language

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