kamon-io / sbt-kanela-runner   2.0.14

Scala versions: 2.12
sbt plugins: 1.0


This project contains sbt plugins that automatically configure your build to perform enable the Kanela instrumentation agent when running your application from within SBT, both for regular applications and Play Framework projects in development mode.

SBT versions 1.2.x and 1.3.x are supported. The last version supporting SBT 0.13 was 2.0.5.

Why this plugin?

First and foremost, simplicity. Although adding the Kanela agent is just about adding the -javaagent option to the JVM, doing so can be challenging when running from SBT. These plugins take care of the corner cases and ensure that hitting run will just work, regardless your project type or whether you are forking the JVM or not.

Regular Projects (non-Play)


Add the sbt-kanela-runner plugin to your project/plugins.sbt file using the code bellow:

addSbtPlugin("io.kamon" % "sbt-kanela-runner" % "2.0.14")


This plugin will only work properly on SBT 1.3 if the classLoaderLayeringStrategy setting is set to Flat or you set fork in run := true.


Just run, like you do all the time!

Here is what the plugin will do depending on your fork settings:

  • fork in run := true: The forked process will run with the -javaagent:<jarpath> and that's all.
  • fork in run := false: The plugin will try to attach the Kanela agent to the current process, targetting the ClassLoader where your application is placed.

Play Projects


For Play Framework 2.6 and 2.7 projects add the sbt-kanela-runner-play-2.x to your project/plugins.sbt file:

// For Play Framework 2.6
addSbtPlugin("io.kamon" % "sbt-kanela-runner-play-2.6" % "2.0.14")

// For Play Framework 2.7
addSbtPlugin("io.kamon" % "sbt-kanela-runner-play-2.7" % "2.0.14")

// For Play Framework <=2.8.7
addSbtPlugin("io.kamon" % "sbt-kanela-runner-play-2.8" % "2.0.10")

// For Play Framework 2.8.8
addSbtPlugin("io.kamon" % "sbt-kanela-runner-play-2.8" % "2.0.14")

Then, you will need to enable the JavaAgent plugin on your Play project. Find your play project on your build.sbt file and call .enablePlugins(JavaAgent) on it, it will probably look like this:

lazy val root = (project in file(".")).enablePlugins(PlayScala, JavaAgent)

This plugin has been tested with Play 2.8.8, Play 2.7.3 and Play 2.6.23.


Just run, like you do all the time! A notice will be shown saying that you are running your application with Kanela.

Lagom Projects


For Lagom Framework 1.6 add the sbt-kanela-runner-lagom-1.6 plugin to your project/plugins.sbt file:

// For Lagom Framework Framework <=1.6.4
addSbtPlugin("io.kamon" % "sbt-kanela-runner-lagom-1.6" % "2.0.13")

// For Lagom Framework Framework >1.6.5
addSbtPlugin("io.kamon" % "sbt-kanela-runner-lagom-1.6" % "2.0.14")

Then you will need to explicitly enable the JavaAgent and SbtKanelaRunnerLagom plugins in one (and only one) of your Lagom implementation projects in the build.sbt file. Beware that Kanela can only instrument one service at a time:

lazy val `hello-impl` = (project in file("hello-impl"))
  .enablePlugins(LagomScala, JavaAgent, SbtKanelaRunnerLagom)


Execute runAll as you normally would.