Integration / Akka interview questions

What is Actor?

Actors are message driven, stateful building blocks.

Messages are passed asynchronously.
Actors may create other actors and form supervision hierarchies.
Actors are lightweight and won't hold threads.

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What is Akka? What is Actor? What are reactive streams? Difference between Java 9 Reactive streams versus Akka Streams. Can Akka be used instead of the Spring framework? What are the problems that the common programming practices face? How the Actor Model addresses common programming practice issues? Components of an Actor. How Actors handle error situations gracefully? Mention some of the Akka libraries that you are aware of/worked with. Benefits of using the Actor model. Should the actor messages be immutable? How do you instantiate an Actor? Explain the Akka actor hierarchy. context.actorOf vs system.actorOf in Akka tool kit. Akka actor life cycle hooks. Different message delivery semantics. Advantages of using Akka model. Is Actor system heavy weight? Different supervision strategies. What are the children of the root guardian? Can Actor beans be singleton when using Dependency injection (DI)? Difference between tell and ask method in AKKA.

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