Unable to use in memory database via Datomic Local

[mhibberd-dirtt]

Library works great when I use Datomic Local with local storage. But I would like to be able to run with an in memory database and I can't seem to specify ":mem" when creating the client.

val client = Datomic.clientDevLocal("dev", ":mem")

Or

val client = Datomic.clientDevLocal("dev", "mem")

EIther of these calls result in the following exception

Exception in thread "main" datomicClient.anomaly.Incorrect: You must specify an absolute path or the keyword :mem under :storage-dir in a map in
your ~/.datomic/local.edn file, or in your call to client
	at datomicClient.anomaly.AnomalyWrapper.anomaly(AnomalyWrapper.scala:53)
	at datomicClient.anomaly.AnomalyWrapper.anomaly$(AnomalyWrapper.scala:20)
	at datomicClient.Invoke$.anomaly(Invoke.scala:12)
	at datomicClient.anomaly.AnomalyWrapper.catchAnomaly(AnomalyWrapper.scala:14)
	at datomicClient.anomaly.AnomalyWrapper.catchAnomaly$(AnomalyWrapper.scala:10)
	at datomicClient.Invoke$.catchAnomaly(Invoke.scala:12)
	at datomicClient.Invoke.clientDevLocal(Invoke.scala:133)
	at datomicClient.Invoke.clientDevLocal$(Invoke.scala:130)
	at datomicClient.Invoke$.clientDevLocal(Invoke.scala:12)
	at datomicJava.client.api.sync.Datomic$.clientDevLocal(Datomic.scala:50)
	at datomicJava.client.api.sync.Datomic.clientDevLocal(Datomic.scala)