Kotlin DSL

Since Camel 3.9

This DSL is experimental support level and is not recommended being used for production

The java-kotlin-dsl is used for runtime compiling Kotlin routes in an existing running Camel integration. This was invented for Camel K and later ported to Apache Camel.

This means that Camel will load the .kts source during startup and let Kotlin compile this to Java byte code.

Example

The following hello.kts source file:

hello.kts

from("timer:tick")
    .process { e -> e.getIn().body = "Hello Camel K!" }
    .to("log:info")

Can then be loaded and run with Camel CLI or Camel K.

Running with Camel K

kamel run hello.kts

Running with Camel CLI

camel run hello.kts

Rest Example

REST endpoints can be configured using the top level rest block:

my-rest.ktn

rest {
    configuration {
        host = "localhost"
        port = "8080"
    }

    path("/hello") {
        get("/get") {
            produces("application/json")
            to("direct:get")
        }
    }

    path("/bye") {
        post("/post") {
            produces("application/json")
            to("direct:post")
        }
    }
}

from("direct:get")
    .process { e -> e.getIn().body = "{ 'message': 'Hello GET' }" }

from("direct:post")
    .process { e -> e.getIn().body = "{ 'message': 'Hello POST' }" }