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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (MATH-195) Inconsistencies in the Exception hierarchy
Date Thu, 01 Jul 2010 09:21:50 GMT

     [ https://issues.apache.org/jira/browse/MATH-195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gilles reopened MATH-195:
-------------------------

      Assignee: Gilles  (was: Brent Worden)

Focusing on the "Error handling" part of issue [MATH-361|https://issues.apache.org/jira/browse/MATH-361],
I propose to take the summary of viewpoints (on the usage of checked vs unchecked exceptions)
provided in this [article|http://www.ibm.com/developerworks/java/library/j-jtp05254.html],
as a starting point for the discussion.



> 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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