Incremental Build Fails - Cannot Find Implementation

[MadMartian]

MacWire Version: 2.11-2.2.0 Play! Version: 2.11-2.3.10

The incremental compilation fails when adding/removing a class file with:

java.lang.RuntimeException: Cannot find implementations of class class controllers.FooBarGong! at com.softwaremill.macwire.InstanceLookup$class.lookupSingleOrThrow(InstanceLookup.scala:13) ~[util_2.11-2.2.0.jar:2.2.0] at com.softwaremill.macwire.Wired.lookupSingleOrThrow(Wired.scala:10) ~[util_2.11-2.2.0.jar:2.2.0] at Global$.getControllerInstance(Global.scala:41) ~[na:na] ...

Resolution succeeds provided I delete the build output folder do a complete project rebuild.

Upon further investigation, I have learned of an inconsistent classloader state between stack frames as indicated by calling the following from the subject stack frame:

((ClassLoader)this.getClass().getClassLoader()).loadClass("controllers.FooBarGong")

Lookup succeeds from stack frame Global$.getControllerInstance(Global.scala:41) ~[na:na] (class loader ReloadableClassLoader(v1)) but fails to find the class from the deeper stack frame com.softwaremill.macwire.Wired.lookupSingleOrThrow(Wired.scala:10) (class loader PlayDependencyClassLoader)

The call site is fairly simple:

package modules

import play.api.Play
import play.api.libs.ws.WS

import controllers._

import com.softwaremill.macwire._
import services._

object ApplicationModule extends ControllerModule with ServiceModule

trait ControllerModule extends ServiceModule {
  import Play.current

  lazy val fooBarGongController = wire[FooBarGong]
}

[adamw]

Do I understand correctly that all the errors above are compile-time? I'm not sure if I can do anything on the MacWire side, this looks like a problem in resolving class file dependencies on the compiler level ... in interaction with the macro system