HelloQi4jWorld.java

HelloWorld.java

@Mixins( { HelloWorld.Mixin.class } )
public interface HelloWorld
{
    String say();

    interface State
    {
        @NotEmpty Property<String> phrase();
        @NotEmpty Property<String> name();
    }

    abstract class Mixin implements HelloWorld
    {
        @This State state;

        @Override
        public String say()
        {
            return state.phrase().get() + " " + state.name().get();
        }
    }
}

Shorter than solution of http://qi4j.org/latest/tut-composites.html#tut-composites-step9