"jason.greene(a)jboss.com" wrote : This looks great to me. So essentially cache would define a ClassMarshaller which would use magic numbers, and also an Externalizer for the classes those numbers represent. Then it would use an ObjectMarshaller to actually build the byte array. Actually to build the byte array you could just implement ByteOutput and pass your implementation in to Marshaller.start(). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169076#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...