Nicolas Frankel presents on the match between Spring Boot and Kotlin. He discusses why Spring Boot is useful for convention over configuration and out-of-the-box features. Kotlin is also discussed as being more expressive than Java with improved object oriented and functional features. Key benefits of Kotlin include being more expressive than Java, improved object oriented programming, and adding functional programming capabilities. Extension methods are highlighted as a killer feature that allows adding new methods on existing types.

1. SPRING BOOT AND
KOTLIN, A MATCH
MADE IN HEAVEN
@NICOLAS_FRANKEL

2. ME, MYSELF AND I
@nicolas_frankel #kotlin #springboot
 By day
• Consultant
 By night
• Developer
• Blogger
• Book author
• Teacher/trainer
2

3. HYBRIS, AN SAP COMPANY
@nicolas_frankel #kotlin #springboot
3

4. HCP STARTUP CHALLENGE
@nicolas_frankel #kotlin #springboot
4
 Preparation Workshop
• October 4th, 10:00 AM
• StartIt Centar,
Savska 5,
11000 Beograd, Serbia
 http://www.hcpstartupchallenge.com/

5. @nicolas_frankel #kotlin #springboot

6. @nicolas_frankel #kotlin #springboot

7. WHY SPRING BOOT?
@nicolas_frankel #kotlin #springboot
Convention over
configuration
• Kickstart a project in minutes,
not days
Out-of-the-box features
• Actuator
7

8. @nicolas_frankel #kotlin #springboot
8

9. KOTLIN
@nicolas_frankel #kotlin #springboot
Open Source
Compiles to
• JVM bytecode
• JavaScript (experimental)
A "simpler Scala"
@nicolas_frankel #kotlin #springboot
9

10. KOTLIN MAIN FEATURES
@nicolas_frankel #kotlin #springboot
Functional and object-oriented
Statically typed
Null safety
No checked exceptions
Named & optional arguments
Lambdas
Extension functions
Java compatibility
(And more...)
@nicolas_frankel #kotlin #springboot
1

11. KOTLIN MAIN BENEFITS
@nicolas_frankel #kotlin #springboot
More expressive than Java
Improved OO
Functional too
1

12. HELLO KOTLIN!
package hello // no semicolons
// namespace-level functions
// types on the right
// no special syntax for arrays
// optional return type
fun main(args: Array<String>) {
println("Hello Kotlin!")
}
@nicolas_frankel #kotlin #springboot@nicolas_frankel #kotlin #springboot
1

13. THE KILLER FEATURE: EXTENSIONS
@nicolas_frankel #kotlin #springboot
Extension methods
Extension properties
1

14. EXTENSION METHOD
@nicolas_frankel #kotlin #springboot
Add new methods on an
existing type
Called like a method on the
type
Translated to static Util
method in the bytecode
1

15. ENOUGH TALK…
@nicolas_frankel #kotlin #springboot
1

16. KEY TAKEAWAYS
@nicolas_frankel #kotlin #springboot
1

17. Q&A
@nicolas_frankel #kotlin #springboot
http://blog.frankel.ch/
@nicolas_frankel
http://frankel.in/
https://git.io/vVSLG
1