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From "Cyrille Artho (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-1116) NullPointerException in MultivariateVectorOptimizer.getWeight()
Date Mon, 14 Apr 2014 02:53:14 GMT

     [ https://issues.apache.org/jira/browse/MATH-1116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Cyrille Artho updated MATH-1116:
--------------------------------

    Attachment: Report2.java

JUnit test to reproduce this issue.

> NullPointerException in MultivariateVectorOptimizer.getWeight()
> ---------------------------------------------------------------
>
>                 Key: MATH-1116
>                 URL: https://issues.apache.org/jira/browse/MATH-1116
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.2
>         Environment: Mac OS 10.9, Java 6, 7
>            Reporter: Cyrille Artho
>         Attachments: Report2.java
>
>
> The following statement produces a NullPointerException:
> new org.apache.commons.math3.optim.nonlinear.vector.jacobian.LevenbergMarquardtOptimizer().getWeight();
> The documentation does not seem to indicate that other data must be set before getWeight
is used (at least I could not find that information). In this case, weightMatrix is still
null because it has not been initialized.
> This call should probably throw an IllegalStateException, which makes it clear that this
API usage is incorrect.
> This test uses LevenbergMarquardtOptimizer but any instantiable subclass of MultivariateVectorOptimizer
probably works the same way.



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