j.u.c.atomic.{Double,Long}.{Accumulator,Adder} extend a package-private
class Striped64 that does striping on 64-bit values. This super type is
Serializable by way of extending Number. Striped64 doesn't contribute
any serial fields but its name does leak into the serial stream because
there is a descriptor for the super type when it is also serializable.
Those that write conformance tests have noticed this.
In practical terms this is a bit of a non-issue but the reference to
Striped64 can be removed from the serial stream by changing these four
to use a serialization proxy. Doug has gone ahead and changed the
classes in jsr166 CVS and we need to bring these changes into jdk8/tl by
the ZBB date.
The webrev with the proposed changes is here:
http://cr.openjdk.java.net/~alanb/8026344/webrev/
A minor difference with what is currently in the CVS is that I've added
a link in the writeReplace javadoc to the proxy class. I've also added a
simple test as I didn't find any tests in the jdk repository that
exercise serialization of these classes.
-Alan.
