Why do JavaBean properties have to be serializable in iWS6?

I'm just getting started on JSP in iWS6.<P>
It seems that the data types of properties (e.g. the type returned by the getter) must be serializable types. or the bean just generates errors when used. (I was surpised that it was the properties, not the static variables that support them, that had to be serializable.)<P>
I have 3 JSP books and none of them mention that restriction, though they do say that the whole bean should be serializable if you want to support persistence in clustering and similar environments (which I'm not using). The books give examples of using non-serializable types for properties, like into or double.<P>
Why is iWS6 imposing this restriction (and not documenting it!)?

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