Scope of Singleton

[Srikanth Penta]

What is the scope of singleton object?

Somewhere I read, it depends on the class loader which we use to load it.
In that case, what are the different cases?

Can anyone please help me?

[Ilja Preuss]

Well, in Java, a class loaded by different class loaders actually is considered to be different classes. So "only one instance for the class" comes down to "one instance per classloader used to load the class".

[Srikanth Penta]

What if the Singleton class is loaded by System loader?

[Nitesh Kant]

Originally posted by Srikanth Penta:
What if the Singleton class is loaded by System loader?

what Ilja Preuss said is still correct !
The singleton will be a singleton per classloader.
One can still load the class already loaded by the system classloader, from a seperate URL. So, even if a class is loaded by the system classloader, it may be loaded again by some other classloader in the same jvm instance.
[ May 08, 2007: Message edited by: Nitesh Kant ]

[Ilja Preuss]

Originally posted by Srikanth Penta:
What if the Singleton class is loaded by System loader?

I don't think there is anything special about the system class loader in this case. Why do you ask?

[Srikanth Penta]

I thought System loader is the universal loader for a JVM and don't know that same class can be loaded with diff. url.