Re: Common Error/Exception Handler

[gauthier@unilim.fr (Michel Gauthier)]

In article <4lggbm$fth@news.sanders.lockheed.com>, John Cupak
<jcupak@isd99.sanders.lockheed.com> wrote:

>>  I was thinking that a "global error/exception handler" package would
be easier
>>  to maintain, since *all* error definitions and messages would be in a single
>>  place. 
>>  
>>  Comments?

IMHO, this idea is not consistent with weak coupling principles _if_ your
package is unique for all the system.

At the opposite, I suggest to the students to group their exceptions in
a package that is common to all a "subsystem", say a library. This package
ought to be non-generic.

Yet better, if appropriate, this package with exceptions can sensibly be
the root of a hierarchy of components. 

In both cases, there are generally some other common entities which can
be declared together with the exceptions. Example :
 - Calendar declares exceptions, number of days and day names,
 - Calendar.Gregorian declares the types for years, months and days,
 - Calendar.Gregorian.Calendar declares the type Date itself.

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