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https://issues.apache.org/jira/browse/LANG-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155699#comment-13155699
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Paul Benedict commented on LANG-753:
------------------------------------

This is not a bug. We changed notNull() to throw NPE in 3.0 to align with the 
JDK which is the "best practice". JDK 7 includes a similar public method in 
java.util.Objects and also throws NPE on null.
                
> Validate.notNull() should throw IllegalArgumentException but throws 
> NullPointerException
> ----------------------------------------------------------------------------------------
>
>                 Key: LANG-753
>                 URL: https://issues.apache.org/jira/browse/LANG-753
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.*
>    Affects Versions: 3.0.1
>            Reporter: Oliver Siegmar
>
> Validate.notNull() throws an IllegalArgumentException in commons-lang 2.6, 
> but in 3.0.1 it throws a NullPointerException. I can't find any note about 
> this in the release notes. I think this is a regression, because it could 
> break others code.

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