On Fri, Aug 13, 2010 at 10:15 AM, Chris Hegarty <chris.hega...@oracle.com> wrote: > OK, so we'll allow subclasses to crate their own clones but disallow access > to the default Object.clone implementation. I don't have a particular > problem with this. > > -Chris.
I may be missing something, but if java.lang.Thread.clone() will now throw CloneNotSupportedException, how would subtypes properly implement Cloneable? If the subtype calls super.clone(), CloneNotSupportedException will be thrown. If the subtype calls its own constructor, that would seem to violate the clone contract for any further subtypes. I think it would seem best to either strictly forbid cloning all j.l.Thread and subtypes by making j.l.Thread.clone() final and always throw CloneNotSupportedException, or if you are concerned about violating source compatibility by making j.l.Thread.clone() final then you could make it throw CloneNotSupportedException for threadStatus != 0 (i.e. NEW threads). - Dave
