Multiple ObjectOutputStreams to one ObjectInputStream

I would like to have multiple ObjectOutputStreams (liviing in their own java apps) creating objects and having them all funnel into the server app, and have a single ObjectInputStream handle all the deserialization. Speed and performance are they key, so don't want a lot of instances of ObjectInputStream around (one for each client) and don't want to have to instantiate one with every received message.
So, I made my own ByteInputStream that the ObjectInputStream uses that you can pass arrays of bytes to. It manages them and returns bytes to the OOS as needed.
If I have a single ObjectOutputStream making objects, this works fine. If I have multiple ObjectOutputStreams all making identical objects, it also works. However, if one of the streams gets an object of a different type, it doesn't like it.
I did some bit checking, and objects from different streams only differ in random bytes throughout the byte array. For example, an object that serializes into a byte stream 500 bytes long, differs in 5 bytes scattered throughout the array - none at the beginning (first 50 bytes)
Anyone ever try to use multiple OOSs feeding a single OIS? Any ideas on why I see it work if the object are the same, but not if they differ?

I have created an application which can send/receive 3000 objects per second each in their own ObjectOutputStream/ObjectInputStream
How many object do you need to send? How much bandwidth do you have? You might find the network is your bottleneck not the number of streams.

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