Most common examples of misuse of singleton class

Question

When should you NOT use a singleton class although it might be very tempting to do so? It would be very nice if we had a list of most common instances of \'singletonitis\' t

Answer 1

Well singletons for the most part are just making things static anyway. So you're either in effect making data global, and we all know global variables are bad or you're writing static methods and that's not very OO now is it?

Here is a more detailed rant on why singletons are bad, by Steve Yegge. Basically you shouldn't use singletons in almost all cases, you can't really know that it's never going to be needed in more than one place.