SpringOne 2021 Session Title: Multiplatform Apps with Spring, Kotlin, and RSocket Speaker: Anton Arhipov, Developer Advocate at JetBrains; Oleh Dokuka, Senior Software Engineer at VMware

1. Multiplatform Apps
with Spring, Kotlin,
and RSocket
@olehdokuka
@antonarhipov

2. Anton Arhipov
Developer Advocate, JetBrains
Oleh Dokuka
Senior Software Engineer, VMWare

4. Those are the
di
ff
erent platforms!

5. Kotlin MPP is in Alpha state

8. Code sharing
between frontend
and backend

9. Code sharing
between the different
UI implementations

11. Backend application with
Kotlin and Spring Boot
Web client with React.js

12. Backend application with
Kotlin and Spring Boot
Web client with React.js

13. Backend application with
Kotlin and Spring Boot
Web client with React.js
Common
code

14. Common
code
fun commonFunction() {
platformSpecificFunction()
}
expect fun platformSpecificFunction()

15. Common
code
fun commonFunction() {
platformSpecificFunction()
}
expect fun platformSpecificFunction()
actual fun platformSpecificFunction() {
/
/
JS specifics
}
actual fun platformSpecificFunction()
/
/
JVM specifics
}

16. The use cases for code sharing
Domain mode
l
Validation logi
c
Views (?)

17. https:
/
/
github.com/OlegDokuka/collaborative-todo-list

19. The necessary plugins

20. Platform-speci
fi
c con
fi
guration

21. Source set mappings

22. Shared code:
1. Domain classes
2. Common interfaces
3. Business logic

23. RSocket is the
enabler!

24. Why RSocket?
Multitranspor
t
Multiplexin
g
Multiple interactions model
s
Multilingual

26. DEMO
Oleh, show me the code in the IDE!!!

29. Android and Java plugins
don’t live well together within
MPP projects in Gradle

31. MPP Kotlin project Multi-module Gradle project

32. The common module is
still an MPP project

33. Shared code:
1. Domain classes
2. Common interfaces
3. Business logic
It’s all the same common code
we had in the first version

34. DEMO
Oleh, show me the code in the IDE!!!

36. What about the UI?

40. Thank you!
Q&A
PRESENTATION SOURCE CODE
Oleh Dokuka, Anton Arhipov