JAXB example with marshalling first?

We have a java object (with objects and objects ...) whose instance data we would like to convert into XML files. Once we've created the XML we'd like to recreate the instances from the class files and XML files.
All the the JAXB examples (that we have come across) start with unmarshalling (DTD files and Schemas), then validate and marshall. We have only java classes (and their objects) and don't want to need to rewrite all our existing classes into DTD and schema files (or at least not by hand).
Where could we find a good JAXB example or tutorial that starts with java objects, marshals them and then unmarshals the XML? Or is there no example because it's just not possible?
Thanks in advance.
Morten

First, I would recommend not using JAXB yet. I believe it will be a VERY useful API when complete, but as it is only early release and the next version of the API may not be "API-level compatible" (quote from http://java.sun.com/xml/jaxb/index.html), I would not use it.
Now, to answer your question. I do not believe there is a tool to do what you are asking. I know the current version allows you to take an existing DTD, create a binding schema and get Java Classes from that. I am almost certain there is nothing to create a DTD from a Java Class.
I believe the intent was to be something like the IDL tools. As a DTD defines the rules for an XML doc, which itself is totally platform independent, a DTD is nothing more than a platform independent way to define a data structure. JAXB is a tool that takes that one step further and gives you a Java Bean guarenteed to be a normal bean, but also go from/to XML.

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