But that is a rather breaking change...

Means that all exception handlers that expect the wrapped exception is not going to get the wrapper.

True, so it could be configurable:

- default to OFF
- SAFE_WRAP mode: wrap in a copy of itself, if a suitable constructor can be found
- AKKA_WRAP in AkkaRethrownException

Why not just add a logging statement with debug visibility just prior to the rethrow and log the line number?

I was pretty sure that the stack trace was recorded when the exception is actually created, not when it is thrown. Is there something specific that must be done get this behavior to appear? I tried it out in the REPL:

scala> import akka.dispatch.Future
import akka.dispatch.Future

scala> case class Boom(msg: String) { def goBoom = sys.error(msg) }
defined class Boom

scala> Boom("Make boom!")
res0: Boom = Boom(Make boom!)

scala> Future { res0.goBoom }
res1: akka.dispatch.Future[Nothing] = akka.dispatch.DefaultPromise@25310bde

scala> res1.get
java.lang.RuntimeException: Make boom!
        at scala.sys.package$.error(package.scala:27)
        at Boom.goBoom(<console>:8)
        at $anonfun$1.apply(<console>:12)
        at $anonfun$1.apply(<console>:12)
        at akka.dispatch.Future$$anonfun$apply$1.liftedTree1$1(Future.scala:241)
        at akka.dispatch.Future$$anonfun$apply$1.apply$mcV$sp(Future.scala:240)
        at akka.dispatch.TaskInvocation.run(MessageHandling.scala:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
        at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:187)

scala> res1.resultOrException
java.lang.RuntimeException: Make boom!
        at scala.sys.package$.error(package.scala:27)
        at Boom.goBoom(<console>:8)
        at $anonfun$1.apply(<console>:12)
        at $anonfun$1.apply(<console>:12)
        at akka.dispatch.Future$$anonfun$apply$1.liftedTree1$1(Future.scala:241)
        at akka.dispatch.Future$$anonfun$apply$1.apply$mcV$sp(Future.scala:240)
        at akka.dispatch.TaskInvocation.run(MessageHandling.scala:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
        at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:187)

scala> throw res1.exception.get
java.lang.RuntimeException: Make boom!
        at scala.sys.package$.error(package.scala:27)
        at Boom.goBoom(<console>:8)
        at $anonfun$1.apply(<console>:12)
        at $anonfun$1.apply(<console>:12)
        at akka.dispatch.Future$$anonfun$apply$1.liftedTree1$1(Future.scala:241)
        at akka.dispatch.Future$$anonfun$apply$1.apply$mcV$sp(Future.scala:240)
        at akka.dispatch.TaskInvocation.run(MessageHandling.scala:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
        at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:187)

All the same stack trace no matter how it gets thrown, and it always originates within the dispatcher thread.

Oh wait.... I think I misunderstood. You want the stacktrace to show it is coming from resultOrException, right? Doh!

Updating tickets (#859, #1036, #1037, #1067, #1085, #1105, #1106, #1166)

Updating tickets (#1165, #1263, #1264, #861, #875, #920, #950, #1037, #1049, #1087, #1105, #1106, #1162, #1166, #1167, #1173, #1236, #1255, #1272, #1292, #1293, #1322, #1325, #1364, #1384, #1385, #1390, #1403, #1408, #1423, #1426, #1428, #1493, #1494, #1538, #998, #1085)

I think this needs to be closed an invalid. I don't want to use a wrapper since it destroys catch-clauses.
I've experimented using Object.clone but most Throwables aren't clonable, otherwise I could've just done clone().asInstanceOf[Throwable].setStackTrace(Thread.currentThread.getStackTrace)