EntityExistsException issue

[Udi]

Hey,
I have this case:

class Book{
     @id
     protected long id;
     private static number = 0;

     @prePersist
     private void makeSomeID(){
           id = ++number;
     }
}

class Persister{
     public static void main(...){
           while (true){
                  em.persist(new Book());
           }
     }
}

I don't know why I sometimes get EntityExistsException.
The openJPA documentation says nothing about this exception. Why do I get
it?

ps - I know it's not compiling, I just can't copy the code from the
workspace...

thanks

Udi
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