From user:

I've noticed an issue in one of code examples for AKKA 2.0.3 Java API:

http://doc.akka.io/docs/akka/2.0.3/java/untyped-actors.html#HotSwap

Procedure<Object> angry = new Procedure<Object>() {
@Override
public void apply(Object message) {
        if (message.equals("foo")) {
            getSender().tell("I am already angry?");
        } else if (message.equals("foo")) {
            getContext().become(happy);
        }
    }
};

I guess it should be:

Procedure<Object> angry = new Procedure<Object>() {
@Override
public void apply(Object message) {
        if (message.equals("bar")) {
            getSender().tell("I am already angry?");
        } else if (message.equals("foo")) {
            getContext().become(happy);
        }
    }
};