Re: SingletonFactory and safe publication

     However, Goetz & Co. also opine that DCL is less useful now than
it once was (ironic: It was useful when it didn't work, and now that
it works it's useless). Uncontended synchronization, they say, is a
lot faster than it used to be, so working hard to avoid it is effort
misdirected. Instead, they recommend the shorter/simpler/safer
"holder class" method, here paraphrased in the O.P.'s terms:

     public class SingletonFactory {
         private static class SingletonHolder {
             static final Singleton instance = new Singleton();
         }
         public Singleton get() {
             return SingletonHolder.instance;
         }
     }