Spring Fu on GraalVM

Transcript

1. Spring Fu on GraalVM 2018-06-27 Taro Nagasawa

2. Taro - たろう • @ngsw_taro • Organizer of Japan Kotlin

   User Group

3. Redesign Medical Care

4. GraalVM • Platform developed by Oracle • Polyglot VM ◦

   JVM-based languages (Java, Scala, Kotlin! …) ◦ JavaScript, Python, Ruby, R ◦ LLVM-based languages (C, C++, ...) • AOT Compiler ◦ Java code is compiled to native code • Community Edition / Enterprise Edition

5. $ docker run --rm findepi/graalvm java -version openjdk version "1.8.0_171"

   OpenJDK Runtime Environment (build 1.8.0_171-11) GraalVM 1.0.0-rc2 (build25.71-b01-internal-jvmci -0.43, mixed mode)

6. Familiar Spring Boot application @SpringBootApplication class DemoApplication fun main(args: Array<String>)

   { runApplication<DemoApplication>(*args) } @Service class HelloService { fun hello(): String = "Hello, world!" } @RestController class HelloController(val helloService: HelloService) { @GetMapping("") fun hello(): String = helloService.hello() }

7. $ ./gradlew bootRun $ curl http://localhost:8080 Hello, world! Spring app

   written in Kotlin runs on GraalVM

8. $ ./gradlew assemble $ native-image -jar\ build/libs/demo-0.0.1-SNAPSHOT.jar Native

9. $ ./gradlew assemble $ native-image -jar\ build/libs/demo-0.0.1-SNAPSHOT.jar Error: com.oracle.graal.pointsto.constraints.Un supportedFeatureException:

   Unsupported field jav a.net.URL.handlers is reachable Native

10. Spring Fu • Micro-framework for Kotlin • Like Spring 5

    functional registration

11. Hello, Spring Fu class HelloService { fun hello(): String =

    "Hello, world!" } class HelloController(val helloService: HelloService) { fun hello(request: ServerRequest): Mono<ServerResponse> { val hello = helloService.hello() return ServerResponse.ok().syncBody(hello) } }

12. Hello, Spring Fu fun main(args: Array<String>) = application { bean<HelloService>()

    bean<HelloController>() webflux { server(netty(8080)) { routes { this.context = this@application.context val helloController = ref<HelloController>() GET("/", helloController::hello) } } } }.run(await = true)

13. Hello, Spring Fu fun main(args: Array<String>) = application { bean<HelloService>()

    bean<HelloController>() webflux { server(netty(8080)) { routes { this.context = this@application.context val helloController = ref<HelloController>() GET("/", helloController::hello) } } } }.run(await = true)

14. $ ./gradlew bootRun $ curl http://localhost:8080 Hello, world! Spring Fu

    app runs on GraalVM

15. $ ./gradlew assemble $ native-image -jar build/libs/app.jar Native!

16. $ ./gradlew assemble $ native-image -jar build/libs/app.jar Error: com.oracle.graal.pointsto.constraints.Un supportedFeatureException:

    Unsupported field jav a.net.URL.handlers is reachable Native!

17. Spring Fu does not support GraalVM AOT compiler

18. None

19. One more thing...

20. Kotlin Fest 2018 Tokyo Aug. 25th More information coming soon.

21. Thank you! Enjoy Kotlin!