This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
A reference (i.e., a pointer) to an object is only valid within one JVM. Once an object has been serialized in some form (like into SOAP) and sent somewhere else, a reference to it has no meaning, so the answer is no.