How can I tell if an Object Input Stream has more objects to read?

I have a utility that I'm working on where objects are sent via the network as a complete file. I read the objects, update some, and send them back. I never know how many objects are in the file. I cache the file locally prior to performing this operation. It runs in a chron job.
Currently I am reading until I get an EOF exception. Is there a better way? I've tried available() but it is always returning me zero.
Thanks.
ST

The API says:
Any attempt to read object data which exceeds the
boundaries of the custom data written by the
corresponding writeObject method will cause an
OptionalDataException to be thrown with an eof field
value of true.
Hope this helpsThis doesn't help at all. It refers to what happens while you are reading a single object, not to what happens when you try to read a new object. You will not get this exception between objects.
If as I suspect you are reading from a socket you really have no choice but to try the read, maybe with a timeout. EOF is the only condition that can reliably indicate that there are no more objects in this stream.

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