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Date: Thu, 1 Jul 2010 14:47:50 -0400 (EDT)
From: "Luc Maisonobe (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (MATH-195) Inconsistencies in the Exception
 hierarchy
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    [ https://issues.apache.org/jira/browse/MATH-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884377#action_12884377 ] 

Luc Maisonobe commented on MATH-195:
------------------------------------

I still think checked exception are a good thing as they are "self documenting" as presented in the paper.
However, I won't argue on that. If you think most exceptions in CM should be unchecked, then go for it. But in this case, please create many different types of exceptions and do document them in the @exception javadoc, otherwise they will be lost at some level in the API.

> Inconsistencies in the Exception hierarchy
> ------------------------------------------
>
>                 Key: MATH-195
>                 URL: https://issues.apache.org/jira/browse/MATH-195
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 1.1, 1.2, 2.0, Nightly Builds
>            Reporter: Thomas Chust
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 2.1
>
>   Original Estimate: 0.17h
>  Remaining Estimate: 0.17h
>
> I think there are some inconsistencies in the hierarchy of exceptions used by the Commons Math library which could easily be fixed:
>   - org.apache.commons.math.linear.MatrixIndexException should really be a subclass of
>     java.lang.IndexOutOfBoundsException.
>   - Either org.apache.commons.math.linear.InvalidMatrixException should be checked or
>     org.apache.commons.math.random.NotPositiveDefiniteMatrixException and
>     org.apache.commons.math.geometry.NotARotationMatrixException should be unchecked, but in any case the latter two
>     should be subclasses of the former. An unchecked InvalidMatrixException should probably be a subclass of
>     java.lang.ArithmeticException while a checked InvalidMatrixException should be a subclass of
>     org.apache.commons.math.MathException.

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