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Actor4j - Core

Actor4j is an actor-oriented Java framework, based on the actor model. Actor4j uses Akka as a base reference implementation. Akka is in turn influenced by Erlang, especially by the supervision concept. A new thread pool architecture was designed, specially designed for the exchange of messages between the actors. In contrast to Akka, with Actor4j not every actor has its own queue, but there are several task-specific queues that are located in the assigned thread. Incoming messages are injected into the actor via the corresponding thread. Each actor is permanently assigned to a thread. With this new thread pool architecture, Actor4j has significantly better performance compared to Akka. It exists also a specification for Actor4j.

For more information on Actor4j, see the following more complete documentation on Fallback documentation under

The Actor4j - Core library (v1.1.0) has no external dependencies and is also compilable as a native image with GraalVM.


This framework is released under an open source Apache 2.0 license.


D. A. Bauer and J. Mäkiö, “Actor4j: A Software Framework for the Actor Model Focusing on the Optimization of Message Passing,” AICT 2018: The Fourteenth Advanced International Conference on Telecommunications, IARIA, Barcelona, Spain 2018, pp. 125-134, [Online]. Available from:

D. A. Bauer and J. Mäkiö, "Hybrid Cloud – Architecture for Administration Shells with RAMI4.0 Using Actor4j," 2019 IEEE 17th International Conference on Industrial Informatics (INDIN), Helsinki, Finland 2019, pp. 79-86, [Online]. Available from:

Development State

This software framework is currently in a prototype state.


I am currently working on a new version 1.1.0 for Actor4j. In the near future the new version and also the other libraries will be available as a Maven dependency, as far as possible. The entire documentation is more related to the new version 1.1.0.

Currently you can add the following Maven dependency to your pom.xml file:


or a SNAPSHOT (v1.1.0) with



Last updated: February 17, 2021

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