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Add customized NPE for null actor system (#23580)

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* Add customized NPE for null actor system

* "system must not be null!"
This commit is contained in:
Will Sargent 2017-09-04 07:31:43 -07:00 • committed by Arnout Engelen
parent 1e4e7cbba2
commit b600c517a1
1 changed files with 3 additions and 1 deletions
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4
akka-actor/src/main/scala/akka/actor/Extension.scala
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@ -74,7 +74,9 @@ trait ExtensionId[T <: Extension] {
/** /**
* Returns an instance of the extension identified by this ExtensionId instance. * Returns an instance of the extension identified by this ExtensionId instance.
*/ */
def apply(system: ActorSystem): T = system.registerExtension(this) def apply(system: ActorSystem): T = {
java.util.Objects.requireNonNull(system, "system must not be null!").registerExtension(this)
}
/** /**
* Returns an instance of the extension identified by this ExtensionId instance. * Returns an instance of the extension identified by this ExtensionId instance.