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Multiple singletons in two or more virtual machines
Multiple singletons simultaneously loaded by different class loaders
Singleton classes destroyed by garbage collection, then reloaded
Purposely reloaded singleton classes
Multiple instances resulting from incorrect synchronization
Multiple singletons arising when someone has subclassed your singleton
Copies of a singleton object that has undergone serialization and deserialization
Multiple singletons created by a factory specially asked to create multiple objects
