Bill,
I'm skeptical of any automated procedure to identify immutable classes. I
believe (as I mentioned before) that we haven't formally defined what
constitutes an immutable class. Further, I do not know whether it's
feasible to do so.
A related point worth mentioning is that any immutable class that isn't
final (or whose methods aren't final) is inherently insecure. BigInteger
and BigDecimal come to mind. (It was simply an error on my part that all of
the methods in these classes weren't final.) While we could "protect" such
classes, it seems less compelling than protecting "final immutable" classes
like String.
Josh
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