Slides for the talk about Spring Boot and Kotlin at vJUG24

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

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

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

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

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

9. 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
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@nicolas_frankel #kotlin #springboot

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

11. 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
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12. ENOUGH TALK…
@nicolas_frankel #kotlin #springboot
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13. SPRING WEB 5 FUNCTIONAL & KOTLIN
@nicolas_frankel #kotlin #springboot
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https://docs.spring.io/sprin
g/docs/current/spring-
framework-
reference/languages.html#kot
lin-bean-definition-dsl

14. REACTIVE SPRING
@nicolas_frankel #kotlin #springboot
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15. KEY TAKEAWAY
@nicolas_frankel #kotlin #springboot
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16. Q&A
@nicolas_frankel #kotlin #springboot
http://blog.frankel.ch/
@nicolas_frankel
@nfrankel (#vjug24)
https://git.io/vVSLG
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