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From: =?utf-8?Q?S=C3=A9bastien_Brisard_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Created] (MATH-861) Make sure that entries of FieldVectors
 cannot be null
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S=C3=A9bastien Brisard created MATH-861:
--------------------------------------

             Summary: Make sure that entries of FieldVectors cannot be null
                 Key: MATH-861
                 URL: https://issues.apache.org/jira/browse/MATH-861
             Project: Commons Math
          Issue Type: Improvement
            Reporter: S=C3=A9bastien Brisard
             Fix For: 3.2


As part of MATH-854, an extensive review of exceptions possibly thrown thro=
ughout CM is being carried out.

It turns out that in {{FieldVector}}, {{NullArgumentException}}s may occur =
because {{FieldElement}} throws such an exception for all elementary operat=
ion. In {{FieldVector}}, this has an impact on
* operations involving a {{FieldElement}} as an argument, eg {{mapAdd(T d)}=
} and the likes: for these method, the throws clause has been altered.
* operations involving a {{FieldVector}} as an argument, eg {{add(FieldVect=
or<T> v}}. In order to avoid catching and rethrowing a {{NullArgumentExcept=
ion}}, all implementations of {{FieldVector}} should make sure that no vect=
or entry can be {{null}}.

As a consequence
* the above statement must be added to the class comment of {{FieldVector}}
* all constructors, setters and the likes must explicitely check for {{null=
}}

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