Java bullshit

What would you use for representing messsages in java netcode?

>1. Serializable message objects
>2. Json/xml strings
>3. Build your own command language a´ command [attr1, attr2]
>4. Imitate c structs in some way.

Im thinking about going with 1, but i guess it means it's gonna be a
very java specific implementation, maybe not the best if i want to, for example,
rewrite the server in python later.

What do you think?

>>5
I do not care. As long as it is any of the listed. I am into embedded  tech. I need C as best I can. Unless you can get me a good compiler for scheme, that would be awesome. Got anything better than Stalin?