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The Grails Framework
    in 5 minutes




                       David Trattnig, 2010
Full-Stack Framework


•   Presentation

•   Business Logic

•   Persistence


•   Build & Test

•   Documentation
                     photo credits: http://www.flickr.com/photos/slipstreamjc/748716731
An evolution.

    Java EE

     Java Language                         JDK

                           Java Virtual Machine



•   Leverages existing resources
    (works with „JVM friendly“ hardware, software and humans)


•   Build upon industry-proven technologies
    (established, well tested and scalable Java frameworks & libraries)
Convention over Configuration
           (CoC)

•   No more painful XML
    settings

•   80 / 20 rule

•   Don‘t repeat yourself
    (DRY)


                            photo credits: http://www.flickr.com/photos/squirmelia/2451382877
Domain Driven Design (DDD)

•   Focus on the domain, rather than technology

•   Rapid prototyping

•   Adaptable architecture




                photo credits: http://www.flickr.com/photos/garibaldi/209338463
Grails Plugin System

  • 350+ Plugins available
  • Modularized app architecture
  • Reuse established Java libraries



photo credits: http://www.flickr.com/photos/oskay/265899865, http://www.flickr.com/photos/oskay/265899967, http://www.flickr.com/photos/oskay/265899811/
Groovy, the language


•   Less and more expressive code

•   Mix Java & Groovy

•   Dynamic language for changing requirements

•   Compiles to Java bytecode

•   „Relaxed“ learning-curve for Java programmers
Possible Pitfalls

•   difficult debugging - nature of dynamic languages
    (but enforces proper test-cases)


•   multiple sources for possible defects
    (stack of many but well-tested Java frameworks)


•   „Fear of learning a new language“
    (Split the project in a Grails-Part and pure Java-Part for „traditional“
    developers)
Success Stories...




         ... are happy with

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Grails in 5mins (2010-v0.3)

  • 1. The Grails Framework in 5 minutes David Trattnig, 2010
  • 2. Full-Stack Framework • Presentation • Business Logic • Persistence • Build & Test • Documentation photo credits: http://www.flickr.com/photos/slipstreamjc/748716731
  • 3. An evolution. Java EE Java Language JDK Java Virtual Machine • Leverages existing resources (works with „JVM friendly“ hardware, software and humans) • Build upon industry-proven technologies (established, well tested and scalable Java frameworks & libraries)
  • 4. Convention over Configuration (CoC) • No more painful XML settings • 80 / 20 rule • Don‘t repeat yourself (DRY) photo credits: http://www.flickr.com/photos/squirmelia/2451382877
  • 5. Domain Driven Design (DDD) • Focus on the domain, rather than technology • Rapid prototyping • Adaptable architecture photo credits: http://www.flickr.com/photos/garibaldi/209338463
  • 6. Grails Plugin System • 350+ Plugins available • Modularized app architecture • Reuse established Java libraries photo credits: http://www.flickr.com/photos/oskay/265899865, http://www.flickr.com/photos/oskay/265899967, http://www.flickr.com/photos/oskay/265899811/
  • 7. Groovy, the language • Less and more expressive code • Mix Java & Groovy • Dynamic language for changing requirements • Compiles to Java bytecode • „Relaxed“ learning-curve for Java programmers
  • 8. Possible Pitfalls • difficult debugging - nature of dynamic languages (but enforces proper test-cases) • multiple sources for possible defects (stack of many but well-tested Java frameworks) • „Fear of learning a new language“ (Split the project in a Grails-Part and pure Java-Part for „traditional“ developers)
  • 9. Success Stories... ... are happy with