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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-401) Policy concerning "null"
Date Thu, 05 Aug 2010 11:30:16 GMT

    [ https://issues.apache.org/jira/browse/MATH-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895648#action_12895648
] 

Gilles commented on MATH-401:
-----------------------------

Some (less than 10) messages already exists. My question is: Do you plan to define one message
per argument type used in CM (potentially in the hundreds)?


> Policy concerning "null"
> ------------------------
>
>                 Key: MATH-401
>                 URL: https://issues.apache.org/jira/browse/MATH-401
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Trivial
>             Fix For: 3.0
>
>
> Following the discussion on the "dev" ML, it appears that it would be fine to not check
for {{null}} references within CM. The JVM will do it anyway so that it is redundant and not
necessary most of the time (i.e. when usage is valid). When it happens, the problem is obvious
enough that the standard {{NullPointerException}} fully describes it, without the need for
additional specific and localized detailed messages.
> Hence we could remove all explicit checks for {{null}}. Or when early failure is preferred,
make the check and throw {{NullPointerException}} (without a message argument).
> Since failed checks are currently reported with an {{IllegalArgumentException}}, the
change is not backward-compatible.

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