When would a Singleton not work as a Singleton? [duplicate]

Answer 1

There is very good post published on Sun website by author Joshua Fox. Please go through this.

below are some of them scenario when your Singleton doesn't behave like.

1. Multiple Singletons in Two or More Virtual Machines
2. Multiple Singletons Simultaneously Loaded by Different Class Loaders
3. Singleton Classes Destroyed by Garbage Collection, then Reloaded
4. Purposely Reloaded Singleton Classes
5. Copies of a Singleton Object that has Undergone Serialization and Deserialization