WARNING This repo is frozen to be in touch with original presentation. There is a new repository under Kotlin with actual Kotlin version and Kotlin/JS Gradle plugin.

A full-stack demo application written in Kotlin for JetBrains Night Moscow 2019. Presentation video in Russian.

This application displays a feed containing user-generated posts and comments. All data is stubbed by the fakeJSON and JSON Placeholder services.

It is a Kotlin Multiplatform project.

It uses:

• kotlin-multiplatform plugin for Kotlin compilation;
• kotlin-frontend-plugin for frontend configuration;
• Ktor framework as a web server;
• H2 in-memory database with Exposed to preload posts at application startup;
• kotlinx.serialization for client/server (de-)serialization and RPC;
• React, Styled components, Ring UI 2.0 and kotlin-wrappers for rendering.

During application startup posts are preloaded to the in-memory database from the fakeJSON (or JSON Placeholder) service. When the user requests the page, several posts are selected from the DB and the corresponding comments are fetched via the multi-platform HTTP client. Posts with comments are served to the client via RPC. After the initial render is done, information about authors is fetched via the client-side HTTP client and rendered after all coroutines terminate successfully. The "Load more comments" button fetches additional comments for the post using the multi-platform HTTP client.

This application has no error handling and has very limited RPC serialization. It's not meant for production use and serves only as a technology example.

gradle run runs webpack-dev-server and the Ktor application. You can find logs at build/logs.

gradle stop stops webpack-dev-server and the Ktor application.

gradle bundle to create static files bundle.

gradle webpack-run runs webpack-dev-server only.

gradle webpack-stop stops webpack-dev-server only.

gradle ktor-run runs the Ktor application only.

gradle ktor-stop stops the Ktor application only.

gradle jvmTest to run common and JVM tests with JUnit.

gradle runKarmaTests to run common and JS tests with Mocha and Karma.

webpack-dev-server responds at http://0.0.0.0:8080, the Ktor application responds at http://0.0.0.0:8081.

Feel free to contact me via:

• [email protected]
• Kotlin Slack channel
• GitHub issues

Pull requests are welcome!