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Mention no implicit sender in coexistence.md #28074 (#28173)

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* Mention no implicit sender in coexistence.md #28074
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Helena Edelson 2019-11-20 02:56:35 -08:00 • committed by Arnout Engelen
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9
akka-docs/src/main/paradox/typed/coexisting.md
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@ -116,13 +116,20 @@ Scala
Java
: @@snip [TypedWatchingClassicTest.java](/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/coexistence/TypedWatchingClassicTest.java) { #typed }
@@@ div { .group-scala }
Note that when sending from a typed actor to a classic `ActorRef` there is no sender in scope as in classic.
The typed sender should use its own `ActorContext[T].self` explicitly, as shown in the snippet.
@@@
@@@ Note
One important difference when having a typed system and a typed user guardian actor and combining that with classic actors
is that even if you can turn the typed `ActorSystem` to a classic one it is no longer possible to spawn user level
actors, trying to do this will throw an exception, such usage must instead be replaced with bootstrap directly in the
guardian actor, or commands telling the guardian to spawn children.
@@@
## Supervision