This blog post is first in a series of posts that will teach the tenants and implementations of Reactive Programming. We well explore the content as laid out in Reactive Application Development of which I co-author.

Immutable transference is the only safe way to share state. If a state structure is immutable, then it is impossible for anyone to alter it. In Akka, this is how we guarantee the message we send is the same message our recipient receives. By making our messages immutable, we assure their accuracy and eliminate the possibility of contention. Let’s take a look at two ways we can model messages in Java.