pattern matching fails on second try - scala

Question

I am using the following code to pattern match an instance of PrivateKey:
import java.security.interfaces.{RSAPrivateKey, RSAPublicKey}
import java.security.{PrivateKey, PublicKey}
object ClientPrivateKey {
def apply(privateKey: PrivateKey) = privateKey match {
case k: RSAPrivateKey ⇒ RSAClientPrivateKey(k)
case k: EdDSAPrivateKey ⇒ EDCClientPrivateKey(k)
}
}
val pk: PrivateKey = ....
ClientPrivateKey(pk)
I am getting a weird behavior when running tests with sbt ~test. On the first run the test passes, on subsequent tries, without restarting sbt, the test fails with:
[info] scala.MatchError: net.i2p.crypto.eddsa.EdDSAPrivateKey#e5d5feef (of class net.i2p.crypto.eddsa.EdDSAPrivateKey)
[info] at com.advancedtelematic.libtuf.data.ClientDataType$ClientPrivateKey$.apply(ClientDataType.scala:39)
[info] at com.advancedtelematic.tuf.keyserver.daemon.KeyGenerationOp$$anonfun$saveToVault$1.apply(KeyGeneratorLeader.scala:122)
[info] at com.advancedtelematic.tuf.keyserver.daemon.KeyGenerationOp$$anonfun$saveToVault$1.apply(KeyGeneratorLeader.scala:121)
[info] at scala.concurrent.Future$$anonfun$traverse$1.apply(Future.scala:576)
[info] at scala.concurrent.Future$$anonfun$traverse$1.apply(Future.scala:575)
[info] at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
[info] at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
Which is strange, as net.i2p.crypto.eddsa.EdDSAPrivateKey matches the type of the object being matched.
What can be interfering with this pattern matching?

Answer 1

One thing that comes to my mind is that your privateKey might be coming from a different classloader that the one used by default by your pattern matching code.
You can test this e.g. like that:
def apply(privateKey: PrivateKey) = privateKey match {
case k: RSAPrivateKey ⇒ RSAClientPrivateKey(k)
case k: EdDSAPrivateKey ⇒ EDCClientPrivateKey(k)
case k if k.getClass.getName == classOf[EdDSAPrivateKey].getName =>
val sameClasses = k.getClass == classOf[EdDSAPrivateKey]
val sameClasses = k.getClass.getClassLoader == classOf[EdDSAPrivateKey].getClassLoader
throw new Exception(s"Different class loaders? $sameClasses $sameClassLoaders")
}