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Building Kotlin Serialization from the source

JDK version

To build Kotlin Serialization JDK version 11 or higher is required. Make sure this is your default JDK (JAVA_HOME is set accordingly). This is needed to compile the module-info file included for JPMS support.

In case you are determined to use a different JDK version or experience problems with JPMS, you can turn off compilation of module-info files completely with disableJPMS property: add disableJPMS=true to gradle.properties or -PdisableJPMS to Gradle CLI invocation.

Runtime library

Kotlin Serialization runtime library itself is a multiplatform project. To build the library from the source and run all tests, use ./gradlew build. Corresponding platform tasks like jvmTest, jsTest, macosArm64Test, and so on are also available.

The project can be opened in IntelliJ IDEA without additional prerequisites. In case you want to work with Protobuf tests, you may need to run ./gradlew generateTestProto beforehand.

To install runtime library into the local Maven repository, run ./gradlew publishToMavenLocal. After that, you can include this library in arbitrary projects like usual gradle dependency:

repositories {
    mavenLocal()
}

dependencies {
    compile "org.jetbrains.kotlinx:kotlinx-serialization-core:$serialization_version"
}

To use snapshot version of compiler (if you have built and installed it from sources), use flag -Pbootstrap. If you have built both Kotlin and Kotlin/Native compilers, set KONAN_LOCAL_DIST environment property to the path with Kotlin/Native distribution (usually kotlin-native/dist folder inside Kotlin project).

The master and dev branches of the library should be binary compatible with the latest released compiler plugin. In case you want to test some new features from other branches, which are still in development and may not be compatible in terms of bytecode produced by plugin, you'll need to build the plugin by yourself.

Compiler plugin

Compiler plugins for Gradle/Maven and IntelliJ plugin, starting from Kotlin 1.3, are embedded into the Kotlin compiler.

Sources and steps to build it are located here. In short, you'll just need to run ./gradlew dist install to get 2.x.255-SNAPSHOT versions of Kotlin compiler, stdlib, and serialization plugins in the Maven local repository.