You should use enums for singletons i Java. Simple to write, threadsafe and handles serialization. All with guarantees from the Java language specification.
I wasn't actually talking about singletons, just the doublechecked locking pattern. It's also necessary for laziness on objects that are referenced by multiple threads.
I tend to think Singletons are a dubious design pattern, like a lot of other people.
I tend to think Singletons are a dubious design pattern, like a lot of other people.