Re: is serialization really a performance hog?

Daisy wrote:

To implement Externalizable, we would have to send reference objects
separately,

No you don't, you can just call out.writeObject()/in.readObject() inside the writeExternal/readExternal methods respectively and they will be completely reconstructed.

then use some unique identifer/lookup like hashcode to
re-associate the reference objects at the client.

Unnecessary, see above, serialization will do that for you.

QUESTIONS

I wouldn't serialize the simple object. I would just send its five fields directly with the methods of DataOutputStream/DataInputStream, and use serialization just for the context objects. If they're also simple I would send their pieces directly too.

3. Does inheritance complicate serialization?

Not much, it's just a recursion, not much different from handling the reachable objects actually.
.

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