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- From: David Brownell <db@Eng.Sun.COM>
- To: Jarle Stabell <jarle.stabell@dokpro.uio.no>
- Date: Fri, 19 Feb 1999 15:15:04 -0800
Jarle Stabell wrote:
>
>
> True. I love exceptions and find that they greatly improves the robustness
> of applications, but the reason I'm not convinced about whether it is good
> to be forced to specify what will be thrown is that this in many cases seem
> to require psychic powers of the designer
Nah, just a moderately mature design, proven in some real systems. I use
the rule of thumb that three different (!) layers must use an interface
before it's realistic to call it "stable".
> (or that the "real" exceptions
> must be catched and converted into an "acceptable" one, which looses
> information).
Converting to an "acceptable" one can encapsulate: SAXException does
this, as does InvocationTargetException. A stack of "this error caused
that one caused that one ..." is often much more helpful when diagnosing a
problem than an root cause.
Converting often actually _adds_ information ... like why the error
couldn't be recovered. Keep in mind that a normal behavior for
exceptions is catching and recovering!
- Dave
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