Is the serialization of Guava immutable collections stable?

Question

I was warned against using Guava immutable collections in objects used in serialized communication because if the version of Guava on one end were updated, there could be se

Answer 1

Yes, that is a valid concern.

From the Guava project homepage (http://code.google.com/p/guava-libraries/):

Serialized forms of ALL objects are subject to change. Do not persist these and assume they can be read by a future version of the library.

If you're using Java native serialization Guava is not a good choice.