In the latest years, there has been some push-back against frameworks, and more specifically annotations: some call them magic. Obviously, they make understanding the flow of the application harder. Spring and Spring Boot latest versions go along this trend, by offering an additional way to configure beans with explicit code instead of annotations. It's called functional, because it moves configuration from objects to behavior. This talk aims to demo a step-by-step process to achieve that.

1. MIGRATING TO SPRING
FUNCTIONAL
CONFIGURATION
(WITH KOTLIN)

2. ME, MYSELF AND I
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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Developer
Blogger
Book author
Teacher/trainer
Учу русский язык (плохо)

3. KOTLIN
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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Open Source
JetBrains
Statically typed
FP + OOP
Lambdas
Null safety
No checked exceptions
Named & optional arguments
Extension functions & properties
Java compatibility
etc.

4. SPRING BOOT
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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Open Source
Pivotal
Spring Framework
Convention over
configuration

5. KOTLIN AND SPRING BOOT
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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Play super nice together

6. THE ISSUE
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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Magic
• Annotations
The solution?
• Functional configuration

7. @nicolas_frankel #springboot #kotlin #functionalconfiguration
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8. TAKEAWAYS
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Reactive all the way down
Controllers to routes
• Logic in handlers
Kotlin Bean DSL
Kotlin Route DSL
Lifecycle is a bitch

9. GOING FURTHER
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Spring Fu
Experimental
Might be integrated into
Core Spring

10. Q&A
@nicolas_frankel #springboot #kotlin #functionalconfiguration
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 http://blog.frankel.ch/
 @nicolas_frankel
 https://git.io/fN3Qv