Comments on: Correcting the Billion Dollar Mistake http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/ no buzzwords allowed Wed, 01 Feb 2012 18:42:00 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Lucas Ontivero http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-34654 Lucas Ontivero Wed, 01 Feb 2012 18:42:00 +0000 http://dow.ngra.de/?p=628#comment-34654 It looks very good, however I don´t want to check for nulls (and get NullPointerExceptions) what I want is avoid nulls. The best approach to avoid them is just avoid them. I always say to myself: don´t pass nulls, don´t return nulls. It works, no more problematic nulls in my code ;) It looks very good, however I don´t want to check for nulls (and get NullPointerExceptions) what I want is avoid nulls. The best approach to avoid them is just avoid them. I always say to myself: don´t pass nulls, don´t return nulls. It works, no more problematic nulls in my code ;)

]]> By: Ruudjah http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-34500 Ruudjah Mon, 14 Mar 2011 20:57:00 +0000 http://dow.ngra.de/?p=628#comment-34500 Like Protobuf. Like Protobuf.

]]> By: Peter Lawrey http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5824 Peter Lawrey Tue, 03 Feb 2009 22:03:06 +0000 http://dow.ngra.de/?p=628#comment-5824 If you read the news these days, losing a 25 million a year for forty years does sound as much as it used to. 8-/ I prefer fail-fast approaches and not having null could have been worse than what we might have had! If you read the news these days, losing a 25 million a year for forty years does sound as much as it used to. 8-/
I prefer fail-fast approaches and not having null could have been worse than what we might have had!

]]> By: Peter Lawrey http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5823 Peter Lawrey Tue, 03 Feb 2009 21:59:24 +0000 http://dow.ngra.de/?p=628#comment-5823 I believe JSR-303 suggest @Notnull and @Nullable. A type which few people consider could be null is enum types. e.g. This can throw an NPE! switch(myEnum) { case ENUM1: IMHO, Variables/fields/parameters should be 'final' and not-null by default and only be non-final and/or nullable if explicitly defined so. (Also fields should private by default) I believe JSR-303 suggest @Notnull and @Nullable.
A type which few people consider could be null is enum types. e.g. This can throw an NPE!

switch(myEnum) {
case ENUM1:

IMHO, Variables/fields/parameters should be ‘final’ and not-null by default and only be non-final and/or nullable if explicitly defined so. (Also fields should private by default)

]]> By: Shams Mahmood http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5808 Shams Mahmood Tue, 03 Feb 2009 15:22:16 +0000 http://dow.ngra.de/?p=628#comment-5808 @Rickard I guess we are moving away from the main topic but I'm enjoying this, hence I persist ;). In the case of transfer() the constraints are what is expected of the arguments before transfer() can expect to execute properly. Just like making from non-nullable is a constraint, having from.balance ge amount can be looked upon as a constraint for the caller (deferring responsibility). @Rickard
I guess we are moving away from the main topic but I’m enjoying this, hence I persist ;). In the case of transfer() the constraints are what is expected of the arguments before transfer() can expect to execute properly. Just like making from non-nullable is a constraint, having from.balance ge amount can be looked upon as a constraint for the caller (deferring responsibility).

]]> By: Kirk http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5807 Kirk Tue, 03 Feb 2009 12:19:27 +0000 http://dow.ngra.de/?p=628#comment-5807 Hey, I was there and I do remember it all :) Hey, I was there and I do remember it all :)

]]> By: Jevgeni Kabanov http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5802 Jevgeni Kabanov Tue, 03 Feb 2009 10:57:55 +0000 http://dow.ngra.de/?p=628#comment-5802 @Kirk Hey, it was you who was late for the talk, not me. Just 'cause you cannot remember the previous evening doesn't mean it never happened :P @Kirk
Hey, it was you who was late for the talk, not me. Just ’cause you cannot remember the previous evening doesn’t mean it never happened :P

]]> By: Jevgeni Kabanov http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5801 Jevgeni Kabanov Tue, 03 Feb 2009 10:07:37 +0000 http://dow.ngra.de/?p=628#comment-5801 Apparently JSR 308 already includes compiler inference for @Nullable annotation with non-null default: http://groups.csail.mit.edu/pag/jsr308/ Apparently JSR 308 already includes compiler inference for @Nullable annotation with non-null default:
http://groups.csail.mit.edu/pag/jsr308/

]]> By: Stephan Schmidt http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5800 Stephan Schmidt Tue, 03 Feb 2009 10:06:09 +0000 http://dow.ngra.de/?p=628#comment-5800 Yes :-) Yes :-)

]]> By: Jevgeni Kabanov http://dow.ngra.de/2009/02/01/correcting-the-billion-dollar-mistake/comment-page-1/#comment-5799 Jevgeni Kabanov Tue, 03 Feb 2009 10:03:49 +0000 http://dow.ngra.de/?p=628#comment-5799 @Stephan Nice! I see you're vouching for the same approach on the 7th slide :) @Stephan
Nice! I see you’re vouching for the same approach on the 7th slide :)

]]>