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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