nstojiljkovic / sbt-aspectj-runner

sbt plugin for running aspectj weaver

Version Matrix


This project contains two [sbt] plugins that automatically configure your build to perform [Load-time weaving] (LTW) with Aspectj when running your application from within SBT, both for regular applications and Play Framework projects [in development mode] and ensure that your aspects will always be woven as expected.

SBT version 1.1 is required.

Why this plugin?

First and foremost, simplicity. Although adding the AspectJ Weaver 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-aspectj-runner plugin to your project/plugins.sbt file using the code bellow:

addSbtPlugin("com.github.nstojiljkovic" % "sbt-aspectj-runner" % "1.2.0")


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: A custom classloader called [WeavingURLClassLoader] will be used. This classloader will perform the same load-time weaving duties done by the AspectJ Weaver agent.

Play Projects


For Play Framework 2.6 projects add the sbt-aspectj-runner-play-2.6 to your project/plugins.sbt file:

addSbtPlugin("com.github.nstojiljkovic" % "sbt-aspectj-runner-play-2.6" % "1.2.0")

For Play 2.4 and 2.5 you can use the older sbt-aspectj-play-runner plugin:

addSbtPlugin("com.github.nstojiljkovic" % "sbt-aspectj-play-runner" % "1.2.0")

This plugin has been tested with Play 2.4.8, Play 2.5.10 and Play 2.6.15.


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

The Play Framework SBT plugin will not allow the JVM to be forked so this plugin will override the way class loaders are created to use [WeavingURLClassLoader] instead, making sure that aspects will be woven when running on Development mode.