Why isn't ActionsErrors throwable?

Hello,

I've got a design question concerning the design of
action classes and action class inheritance. I am
trying to implement a reusable method in an action
class. This method should be in a class named
MyActionBase:

protected MyBusinessObject doSomething(...) throws
ActionErrors

The question is: Why doesn't ActionErrors extends
Throwable? Does it make sense to make a change in the
framework class org.apache.struts.action.ActionErrors
and make it throwable?

Thanks,

Tillmann
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[email protected: tillmanns...@yahoo.de]