Comment 10 for bug 744035

I agree that the server side is working as well.
The way I implemented (that's in r326) is by converting the object into a byte array and that's only possible with serializable AFAIK. However, the current interface given to the student uses Object and I think we should check if the object received is either Serializable/IsSerializable before trying to store it. If it's not, we can simply throw and exception as they have been told that RPC only works for those types.