Kotlin Support

Kotlin is a statically-typed language targeting the JVM (and other platforms), enabling concise and elegant code with seamless interoperability with Java libraries. LangChain4j utilizes Kotlin extensions to enhance Java APIs with Kotlin-specific conveniences. This allows users to extend existing Java classes with additional functionality tailored for Kotlin.

For instance, Kotlin extensions can convert a ChatLanguageModel response into Kotlin Suspending Function response into a Kotlin Suspending Function:

val model = OpenAiChatModel.builder()
    .apiKey("your-api-key")
    // more configuration parameters here ...
    .build()

CoroutineScope(Dispatchers.IO).launch {
    val response = model.chatAsync(
        ChatRequest.builder()
            .messages(
                listOf(
                    SystemMessage.from("You are a helpful assistant"),
                    UserMessage.from("Hello!")
                )
            )
    )
    println(response.aiMessage().text())
}

LangChain4j does not require Kotlin libraries as runtime dependencies but allows users to leverage Kotlin's coroutine capabilities for non-blocking execution, enhancing performance and efficiency.