The project structure

.gitignore

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+.idea/
+
+target/

build.sbt

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+organization in ThisBuild := "org.taymyr"
+version in ThisBuild := "0.0.1-SNAPSHOT"
+
+// the Scala version that will be used for cross-compiled libraries
+scalaVersion in ThisBuild := "2.12.4"
+
+val akka = "com.typesafe.akka" %% "akka-actor" % "2.6.3"
+val protobuf = "com.google.protobuf" % "protobuf-java" % "3.11.1"
+val jacksonDataBind = "com.fasterxml.jackson.core" % "jackson-databind" % "2.10.3"
+
+lazy val `core` = (project in file ("core"))
+  .settings(commonSettings)
+  .settings(
+    libraryDependencies ++= Seq(
+      akka,
+      protobuf
+    )
+  )
+
+lazy val `jackson` = (project in file("jackson"))
+  .settings(commonSettings)
+  .settings(libraryDependencies ++= Seq(
+    jacksonDataBind
+  ))
+  .dependsOn(`core`)
+
+lazy val `playjson` = (project in file("playjson"))
+  .settings(commonSettings)
+
+lazy val `akka-gdpr` = (project in file("."))
+  .aggregate(`core`, `jackson`, `playjson`)
+
+lazy val commonSettings = Seq()