[Platemail-developer] exception handling

[David S. <ds...@in...>]

Neil,

What'd you think the best exception handling policy is?  I see you've 
created a PlatemailException class, which I've extended to create a 
RegistryException class, however I'm not sure on the best approach.

As I see it, I (currently) want to have an exception that can be thrown 
when the save/load process fails.  The best behavior here is to have the 
exception pass all the way back to the kernel, which can then perform a 
controlled shutdown.

I'm looking to "fail early" here, which I think is the best idea 
generally, however I don't think that a subsystem should do a 
System.exit() call.

Another question is how many such exceptions I should create; one for 
each type of failure?  Should I do something like this:

SaveException extends RegistryException extends PlatemailException
LoadException extends RegistryException extends PlatemailException

or, should I just have one RegistryException and pass it a string 
specifying the error, which I presume is passed up for 
java.lang.Exception to handle.

I'm leaning toward having an separate exceptions for everything, not 
just things that you might want to differentiate between, though that 
could conceivably be a lot of options.

What'd you think?

dgs.