This is a module that allows you to configure your logback logger with a groovy script instead of a xml file. By default, play just allow you to use xml to avoid the inclusion of the groovy dependency.

You have add this dependency to your project:

//for play 2.5
libraryDependencies += "com.github.tzimisce012" %% "play-logback-groovy" % "0.2.5" 

//for play 2.6
libraryDependencies += "com.github.tzimisce012" %% "play-logback-groovy" % "0.2.6" 

Also, you will have to disable the PlayLogback module as explained here

lazy val root = (project in file("."))
  .enablePlugins(PlayScala)
  .disablePlugins(PlayLogback)

Now you can put your logback.groovy file in your conf folder. Also, you still can use the xml configuration with this module enabled.