pickling objects in jython

[Shahin Saadati]

Hi,
The following sample code is to pickle and unpickle an object. It works 
fine with CPython, but the unpickling fails in Jython and I receive an 
error stating that "A" is unsafe to unpickle (even though I believe I 
have the code to make "A" safe for unpickling). What do I do wrong and 
how can I fix it?
Thanks,

==============================================
import sys
import cPickle
import copy_reg

class A(object):
     __slots__ = ("x","y")
     __safe_for_unpickling__ = True
     def __init__(self, a, b):
         self.x = a
         self.y = b
     def __str__(self):
         return str(self.__getstate__())
     def __reduce__(self):
         return (self.__class__.__name__, self.__getstate__())
     def __new__(cls, a, b):
         return object.__new__(cls)
     def __getnewargs__(self):
         return self.__getstate__()
     def __getstate__(self):
         return (self.x, self.y)
     def __setstate__(self, state):
         (self.x, self.y) = state

copy_reg.constructor(A)
a = A(5,"abcd")

print "Before Pickling: %s"%str(a)
mfile = open("dumptest","wb")
cPickle.dump(a,mfile,-1)
mfile.close()

mfile = open("dumptest","rb")
m = cPickle.load(mfile)
print "After Pickling: %s"%str(m)
mfile.close()
==============================================