Java.il - Confessions of a java developer that fell in love with the groovy language
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The talk from the Java.IL meetup: 'Why every Java developer should know Groovy language'
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Java.il - Confessions of a java developer that fell in love with the groovy language
- 1. Confessions of a Java developer that fell in love with the Groovy language Victor Trakhtenberg victortr75@gmail.com @victortr75
- 2. Personal My name is Victor
- 3. Personal Java.IL community co-‐founder h=p://www.meetup.com/JavaIL/
- 4. Personal Full Stack Engineer @ h@p://commercesciences.com/jobs
- 9. It is NOT an introducFon to Groovy It is NOT “why you should not use Java” It is NOT “why you must use Groovy”
- 10. It is “why every Java developer SHOULD KNOW Groovy”
- 11. Groovy is very easy to enter into for Java developers, since… Java code is Groovy code
- 12. 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…
- 13. Groovy is more than just a set of features, it is more than a be=er Java
- 14. 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…
- 16. Using Groovy Raise your hands Using Java Using Ruby,Python, Scala etc.
- 17. Prelude -‐ REPL
- 20. Map with default
- 23. Using Groovy in a running Java project Our setup: Java Play! Framework project Choose one concern to use Groovy Our choice: JSON manipulaFons
- 24. Parse JSON
- 25. Build JSON
- 26. Case Study: Campaign ConfiguraFon Management
- 27. The Java interface and the Groovy implementaFon
- 30. Is it a ‘coupon’ campaign
- 31. Is it a ‘coupon’ campaign
- 32. Is it a ‘coupon’ campaign
- 34. Update account at Salesforce
- 35. Integrate with Salesforce -‐ AuthenFcate
- 36. URIBuilder
- 38. Challenges • Java <-‐> Groovy bridge – The need for the Java interface • IDE support – Browsing Java code – Groovy code • Long stack traces – challenging debugging • Coding convenFons
- 39. Use Groovy for non-‐producFon
- 40. 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
- 41. 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 • …
- 43. 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
- 44. MrHaki – Groovy Goodness h=p://mrhaki.blogspot.co.il/2009/09/groovy-‐goodness-‐padding-‐strings.html
- 45. Groovy Challenge! Save the date: 31-‐May h=p://www.meetup.com/WeCode-‐IL/
- 47. 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