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https://issues.apache.org/jira/browse/MATH-1116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cyrille Artho updated MATH-1116:
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Attachment: Report7.java
Self-contained unit test to reproduce NullPointerException on
SpearmansCorrelation (the need to initialize it further is not documented yet).
> NullPointerException not advertized in Javadoc
> ----------------------------------------------
>
> 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
> Priority: Minor
> Labels: javadoc
> Attachments: IllegalStateB.java, Report2.java, Report6.java,
> Report7.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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