#4 Change to all Methods!

[Andre Anneck]

Change-Report
--------------

All Methods should check their input paramerts for
validity. If the supplied paramter falls out of the
"good" range, and IllegalArgumentException should be
thrown explaining why the paramert is "bad".

In most cases the simplest and only way of doing a
validity check is too see if the supplied object is ==
null or not.

I am trying to apply this in the complete jcast code,
everywhere I do the commitlog will contain this
Change-Report-Id.

- Andre

[Andre Anneck]

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Accepted and working on it...