On Nov 18, 2008, at 11:43 AM, Ramsey Lee Gurley wrote:
Okay, so I've tried this twice now, and both bounced immediately. I
hope three of these don't show up on the list, but I think the
problem must have been how my mobileme System preference
automatically set up my email account's reply address. Trying one
more time...
On Nov 17, 2008, at 4:20 PM, Mike Schrag wrote:
That's the guy behind the famous "Don’t swallow", right?
This is slightly different, though ... I think everyone's onboard
with not swallowing exceptions.
Umm, I'm a little vague on that point personally... I was recently
asked not to swallow exceptions when submitting a patch, but
frankly... I've heard of it, but I'm not sure what that means. I
read the wiki-page on exception handling...
http://wiki.objectstyle.org/confluence/display/WO/Handling+Errors+and+Exceptions**
So... I'm still a little confused :)
try {
....
}
catch (Exception e) {}
That is swallowing. Don't do it. It just hides errors. OK, there
are some rare, er, exceptions to this rule where the exception is
expected and useless.
I'm talking about chaining exceptions appropriately. But the
problem is that if you only throw RuntimeExceptions, the people
below you have no idea what you might throw and therefore have no
idea when they need to catch and rethrow, which makes it kind of
weird trying to do this effectively with only Runtimes. So my
comment about Chuck was that he doesn't agree with CHECKED
exceptions.
Reading this thread, am I to understand that "don't swallow" means
"always throw" and logging is always unacceptable?
Generally yes. If the exception is expected and can be dealt with or
ignored with the process succeeding as normal, then logging is OK.
But "this will never throw, so never mind, just bury it" is never,
ever acceptable.
If so, what is convention? Do I throw a wrapped exception in a
NSForwardException or something similar?
This seems to be the Wonder standard:
try {
...
} catch (Exception ex) {
throw
NSForwardException._runtimeExceptionForThrowable(ex);
}
I use a version of this in my code:
http://www.javaspecialists.eu/archive/Issue033.html
Inquiring minds...
Swallow, apparently. :-P
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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