Second Alphageeks IL meetup: Yuval Goldstein talks on Groovy & Grails and the shift from static typing to dynamic typing. Check us out for more events: http://alphageeks.blogli.co.il/

1. Groovy & Grails(also) the future of Java Web Development Yuval Goldstein, yuvalgo@gmail.com, @yuvalgo

2. Groovy, Grails, Agenda Beyond Java What’s groovy? What’s grails? How people use them?

3. Beyond Java Java= Language + Classes +JVM JEE = Robust spec to support server-driven apps The good: OO, popular, tons of frameworks, enterprise ready (queues, transactions, web-services) The Bad: Verbose, long turn-around, mix and match your own framework

4. Beyond Java Java code > compiled into bytecode > JVM The JVM supports other languages: Groovy Scala JRuby Jython But WHY? : Because not every problem should be solved by a general purpose language

5. Groovy Cool language, compiles into bytecode Similar to Java, a lot of additions and improvements: Language level support for collections Closures and Builders Dynamic typing Concise syntax Groovy2Java, Java2Groovy integration

6. Demo Let’s take a Java class and show how it’s done in Groovy

7. Closures A piece of code that can be passes around and executed (sort of an Anonymous class with a method)

8. More Closures

9. Demo Let’s see some Collections and Closures working together

10. Groovy typing Types can be specified and enforced Types can unspecified and deducted (Duck Typing)

11. Duck Typing Behavior of objects is determines by their own methods and members rather than by declarations

12. Duck Season? - Demo Let’s see how duck typing works

13. Duck Typing Sacrifice certainty for laziness, WTF? Some application really need strict typing, other doesn’t Frameworks generate a lot of code for you on runtime Faster code changes Good testing really helps You already doing it: HTML, CSS, SQL, JSP

14. Expando Classes

15. String Matching

16. Introducing Grails Grails=Groovy + Spring + Hibernate + Sitemesh A framework for developing web-apps with pleasure Open-Source, supported by Spring-Source Convention over configuration Model-driven Short turnaround Good developer-testing support A lot more…

17. Demo Create an empty application Develop a domain classes Generate a trivial CRUD : dynamic, then static

18. Domain Objects and GORM GORM: Hibernate DSL 1:1, 1:N, M:N, Object hierarchies, Versioning, Cascade, Fetch Objects are DAOs Automatic Query Syntax: Object.save() Object.get(id) Object.findAll()

19. Controllers Each closure maps to a request name Render templates, GSP, XML, JSON Automatic variables: param, session, flash Support Spring Webflow Dependency Injection support (for services)

20. Views GSPs, taglibs, Templates HTML centric Built in Tags for: Forms and error handling , AJAX, Pagination, uploads Pluggable Ajax support: Prototype, YUI, others Plugins: Grails-UI, Flex, GWT, Open Lazzlo, Portlet integration

21. Services Help re-use code, scope transaction, expose web-services Different Scopes: singleton, session, prototype, request, conversation, flow Dependency Injection support Plugins: JMS integration, Quartz Jobs, Xfire/Spring web-services, etc…

22. Testing support Built-in Unit and Integration testing Good mockup support Can’t do without it

23. (Only some) Plugins GrailsUI Acegi Security Twitter Flex Quartz Searchable

24. Groovy, Grails in the wild Groovy: As a scripting tool for developers For testing plain java code For developing swing code (special DSL) For coding grails application Grails: Prototypes and back-office applications Grails Frontend with Java backend Grails frontend and backend

25. Community and support Open-Source, use for free Commercial training and support by spring Grails user newsgroup on Nabble: 40-80 messages a day IDEs: Eclipse, Intellij, Netbeans, TextMate Books:Groovy in action, Grails in Action, Definitive Guide to Grails, Getting started with Grails, Groovy & Grails Recepies, more… Sites:grails.org, aboutgroovy.com, grailspodcast.com, grailstutorials.com

26. Who use Grails? Linkedin.com Sky.com twitcaps.com blerp.com twitsms.co.uk Ganttzilla.com Lot’s of community, e-commerce and twitter oriented sites

27. Summary Grails is ideal for small and medium size application Grails ~= Rails capabilities + JVM + All existing Java frameworks 0 Setup development environment Fun to use

28. Thanks !