Spring Fu on GraalVM - Speaker Deck

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Spring Fu on GraalVM 2018-06-27 Taro Nagasawa

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Taro - たろう ● @ngsw_taro ● Organizer of Japan Kotlin User Group

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Redesign Medical Care

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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

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$ 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)

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Familiar Spring Boot application @SpringBootApplication class DemoApplication fun main(args: Array) { runApplication(*args) } @Service class HelloService { fun hello(): String = "Hello, world!" } @RestController class HelloController(val helloService: HelloService) { @GetMapping("") fun hello(): String = helloService.hello() }

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$ ./gradlew bootRun $ curl http://localhost:8080 Hello, world! Spring app written in Kotlin runs on GraalVM

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

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$ ./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

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Spring Fu ● Micro-framework for Kotlin ● Like Spring 5 functional registration

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

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Hello, Spring Fu fun main(args: Array) = application { bean() bean() webflux { server(netty(8080)) { routes { this.context = this@application.context val helloController = ref() GET("/", helloController::hello) } } } }.run(await = true)

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$ ./gradlew bootRun $ curl http://localhost:8080 Hello, world! Spring Fu app runs on GraalVM

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

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$ ./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!