This repo shows a Gradle multi-project build structure that uses the Kotlin Multiplatform to build a JVM, JS, Desktop and Compose Web (wasm) applications.
# Mac OS
$ curl -s "https://get.sdkman.io" | bash
$ sdk i java 24.ea-open
$ sdk u java 24.ea-open$ ./gradlew build [-Pskip.test]
# Run the app
$ ./gradlew :backend:jvm:runMultiplatform Targets
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Build and Run
$ ./gradlew :backend:jvm:run $ ./gradlew :backend:jvm:build $ ./gradlew :backend:jvm:jdeprscan $ ./gradlew :backend:jvm:printModuleDeps $ ./gradlew :shared:jvmRun # Benchmark $ ./gradlew :benchmark:benchmark -
GraalVM Native Image
$ sdk u java graalvm-ce-dev $ ./gradlew :backend:jvm:nativeCompile $ backend/jvm/build/native/nativeCompile/jvm # To generate the native image configurations $ ./gradlew :backend:jvm:run -Pagent $ curl http://localhost:8080/shutdown $ ./gradlew :backend:jvm:metadataCopy -
Containers
$ docker run \ -it \ --rm \ --pull always \ --workdir /app \ --publish 8080:8080 \ --publish 8081:8081 \ --name kotlin-mpp-playground \ --mount type=bind,source=$(pwd),destination=/app,readonly \ openjdk:24-slim /bin/bash -c "printenv && nohup jwebserver -b 0.0.0.0 -p 8081 -d / & backend/jvm/build/libs/jvm-app" $ ./gradlew :backend:jvm:jibDockerBuild $ docker run -it --rm --name jvm-app -p 8080:8080 -p 9898:9898 sureshg/jvm $ docker stats -
OpenTelemetry
# Install otel-desktop-viewer or Jaeger $ brew tap CtrlSpice/homebrew-otel-desktop-viewer $ brew install otel-desktop-viewer $ otel-desktop-viewer # or run the Jaeger collector $ docker run -it --rm --pull=always \ -e COLLECTOR_OTLP_ENABLED=true \ -p 4317:4317 \ -p 16686:16686 \ jaegertracing/all-in-one:latest $ open http://localhost:16686 # Run the app $ docker run -it --rm \ --name jvm \ -p 8080:8080 \ -p 9898:9898 \ -e OTEL_JAVAAGENT_ENABLED=true \ -e OTEL_TRACES_EXPORTER="otlp" \ -e OTEL_EXPORTER_OTLP_PROTOCOL="grpc" \ -e OTEL_EXPORTER_OTLP_ENDPOINT="http://host.docker.internal:4317" \ -e OTEL_DROP_SPANS="/swagger" \ sureshg/jvm:latest $ curl -v -X GET http://localhost:8080/trace # Change/Reset log level $ curl -v -X POST http://localhost:8080/loglevel/dev.suresh.http/debug $ curl -v -X POST http://localhost:8080/loglevel/reset
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JVM Agents
# Normal agent with Launcher-Agent-Class $ ./gradlew :backend:agent:jfr:build $ backend/agent/jfr/build/libs/jfr-app # Custom OpenTelemetry agent $ ./gradlew :backend:agent:otel:build
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AppCDS
# Run with AppCDS $ java -Xlog:class+load:file=/tmp/cds.log:uptime,level,tags,pid \ -XX:+AutoCreateSharedArchive \ -XX:SharedArchiveFile=/tmp/app.jsa \ -jar backend/jvm/build/libs/jvm-all.jar # cds-log-parser.jar --logFile=/tmp/cds.log
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Tests
$ ./gradlew :backend:jvm:test -PktorTest $ ./gradlew :backend:jvm:test -Pk8sTest $ ./gradlew :backend:jvm:jvmRun -DmainClass=dev.suresh.lang.SysCallKt --quiet
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Binary Compatibility
$ ./gradlew :backend:security:apiDump $ ./gradlew :backend:security:apiCheck
$ ./gradlew :web:jsBrowserProductionRun -t
$ ./gradlew :web:wasmJsBrowserProductionRun -t
$ ./gradlew kotlinUpgradePackageLock
# Kobweb
$ kobweb run -p compose/web
$ ./gradlew :compose:html:kobwebStart -t
$ ./gradlew :compose:html:kobwebStop$ ./gradlew :backend:native:build
$ find backend/native/build/bin -type f -perm +111 -exec ls -lh {} \; | awk '{print $9 ": " $5}'
# Arch specific binaries
$ ./gradlew :backend:native:macosArm64Binaries
$ ./gradlew :backend:native:macosX64Binaries
$ ./gradlew :backend:native:macOsUniversalBinary
# Native container image
$ ./gradlew :backend:native:jibDockerBuild
$ docker run -it --rm --name native-app sureshg/native
# Debug distroless image
# docker run -it --entrypoint=sh gcr.io/distroless/cc-debian12:debug
# Test linux binary on ARM64 MacOS
$ ./gradlew :backend:native:linuxArm64Binaries
$ docker run \
-it \
--rm \
--publish 8080:80 \
--mount type=bind,source=$(pwd),destination=/app,readonly \
debian:stable-slim
# /app/backend/native/build/bin/linuxArm64/releaseExecutable/native.kexe
# libtree -v /app/backend/native/build/bin/linuxArm64/releaseExecutable/native.kexe
# Build native binaries on container
$ docker run \
--platform=linux/amd64 \
-it \
--rm \
--pull always \
--workdir /app \
--name kotlin-native-build \
--mount type=bind,source=$(pwd),destination=/app \
--mount type=bind,source=${HOME}/.gradle,destination=/root/.gradle \
openjdk:24-slim /bin/bash
# apt update && apt install libtree tree
# ./gradlew --no-daemon :backend:native:build
# backend/native/build/bin/linuxX64/releaseExecutable/native.kexe# Compose Desktop
$ ./gradlew :compose:cmp:runDistributable
$ ./gradlew :compose:cmp:packageDistributionForCurrentOS
$ ./gradlew :compose:cmp:suggestModules
# Compose Web
$ ./gradlew :compose:cmp:wasmJsBrowserProductionRun -t
# Compose multiplatform tests
$ ./gradlew :compose:cmp:allTests
$ ./gradlew :compose:cmp:jvmTest$ ./gradlew publishAllPublicationsToLocalRepository
# Publishing to all repo except Central
$ ./gradlew buildAndPublish
# Maven Central Publishing
# https://central.sonatype.org/publish/publish-portal-gradle/#alternatives
# https://vanniktech.github.io/gradle-maven-publish-plugin/central/#in-memory-gpg-key
$ gpg --export-secret-keys --armor XXXXXXXX | grep -v '\-\-' | grep -v '^=.' | tr -d '\n'
# OR
$ gpg --export-secret-keys --armor XXXXXXXX | awk 'NR == 1 { print "SIGNING_KEY=" } 1' ORS='\\n'
$ export ORG_GRADLE_PROJECT_mavenCentralUsername=<Username from https://central.sonatype.com/account>
$ export ORG_GRADLE_PROJECT_mavenCentralPassword=<Token from https://central.sonatype.com/account>
$ export ORG_GRADLE_PROJECT_signingInMemoryKeyId=<GPG Key ID>
$ export ORG_GRADLE_PROJECT_signingInMemoryKeyPassword=<Password>
$ export ORG_GRADLE_PROJECT_signingInMemoryKey=$(gpg --export-secret-keys --armor ${ORG_GRADLE_PROJECT_signingInMemoryKeyId} | grep -v '\-\-' | grep -v '^=.' | tr -d '\n')
# For aggregated publication (preferred)
$ ./gradlew publishAggregatedPublicationToCentralPortal
# For all publications
$ ./gradlew publishAllPublicationsToCentralPortal# Dependency Insight
$ ./gradlew dependencies
$ ./gradlew :shared:dependencies --configuration testRuntimeClasspath
$ ./gradlew -q :build-logic:dependencyInsight --dependency kotlin-compiler-embeddable --configuration RuntimeClasspath
$ ./gradlew -q :shared:dependencyInsight --dependency slf4j-api --configuration RuntimeClasspath
$ ./gradlew :backend:jvm:listResolvedArtifacts
# KMP hierarchy and module graphs
$ ./gradlew :shared:printHierarchy
$ ./gradlew createModuleGraph
$ ./gradlew generateChangelog
# Clean
$ ./gradlew cleanAll
# Gradle Daemon Toolchain
$ ./gradlew updateDaemonJvm
# Gradle Best Practices
$ ./gradlew -p gradle/build-logic :bestPracticesBaseline
$ ./gradlew checkBuildLogicBestPractices
# GitHub Actions lint
$ actionlintModule Dependency Graph
%%{
init: {
'theme': 'neutral'
}
}%%
graph LR
subgraph :backend
:backend:native["native"]
:backend:data["data"]
:backend:profiling["profiling"]
:backend:jvm["jvm"]
:backend:security["security"]
end
subgraph :compose
:compose:desktop["desktop"]
:compose:html["html"]
end
subgraph :dep-mgmt
:dep-mgmt:bom["bom"]
:dep-mgmt:catalog["catalog"]
end
subgraph :meta
:meta:compiler["compiler"]
:meta:ksp["ksp"]
end
subgraph :meta:compiler
:meta:compiler:plugin["plugin"]
end
subgraph :meta:ksp
:meta:ksp:processor["processor"]
end
subgraph :web
:web:js["js"]
:web:wasm["wasm"]
end
:web:js --> :shared
:benchmark --> :shared
:backend:native --> :shared
:web:wasm --> :shared
:compose:desktop --> :shared
:meta:compiler:plugin --> :shared
:meta:ksp:processor --> :shared
:backend:data --> :shared
:backend:profiling --> :shared
:compose:html --> :shared
: --> :backend
: --> :benchmark
: --> :compose
: --> :meta
: --> :shared
: --> :web
: --> :backend:data
: --> :backend:jvm
: --> :backend:native
: --> :backend:profiling
: --> :backend:security
: --> :compose:desktop
: --> :compose:html
: --> :meta:compiler
: --> :meta:ksp
: --> :web:js
: --> :web:wasm
: --> :meta:compiler:plugin
: --> :meta:ksp:processor
: --> :dep-mgmt:bom
: --> :dep-mgmt:catalog
:backend:jvm --> :shared
:backend:jvm --> :backend:data
:backend:jvm --> :backend:profiling
:backend:jvm --> :web:js
:backend:jvm --> :web:wasm
:backend:security --> :shared