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Posted to issues@commons.apache.org by "Cyrille Artho (JIRA)" <ji...@apache.org> on 2014/04/14 08:29:14 UTC
[jira] [Commented] (MATH-1116) NullPointerException in
MultivariateVectorOptimizer.getWeight()
[ https://issues.apache.org/jira/browse/MATH-1116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968118#comment-13968118 ]
Cyrille Artho commented on MATH-1116:
-------------------------------------
getTarget() instead of getWeight() also produces a NPE:
new org.apache.commons.math3.optim.nonlinear.vector.jacobian.LevenbergMarquardtOptimizer().getTarget();
> 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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