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https://issues.apache.org/jira/browse/GROOVY-7882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-7882.
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> NullPointerException in List.toUnique if one element is null
> ------------------------------------------------------------
>
> Key: GROOVY-7882
> URL: https://issues.apache.org/jira/browse/GROOVY-7882
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 2.4.7
> Environment: Mac OS X 10.11.5, Groovy 2.4.7 installed via sdkman
> Reporter: Alexander Franke
> Assignee: Paul King
>
> When using toUnique() on a List I was encountering a NullPointerException
> when one of the elements is null. This does not happen when using .unique()
> which is a quite odd behavior. So except from one being in-place and the
> other returning the sorted List I would expect the same result from both
> methods.
> Following is the output from GroovyConsole that shows the issue.
> {code}
> groovy> List a = [1,4,2,3,3,2,1,4, null]
> groovy> List b = [1,4,2,3,3,2,1,4, null]
> groovy> println a.unique()
> groovy> println a
> groovy> println b.toUnique()
> groovy> println b
>
> [1, 4, 2, 3, null]
> [1, 4, 2, 3, null]
> Exception thrown
> java.lang.NullPointerException
> at ConsoleScript6.run(ConsoleScript6:6)
> {code}
> {code}
> // Interestingly enough, using .toUnique { it } gives the proper result:
> groovy> List b = [1,4,2,3,3,2,1,4, null]
> groovy> println b.toUnique { it }
> groovy> println b
>
> [1, 4, 2, 3, null]
> [1, 4, 2, 3, 3, 2, 1, 4, null]
> {code}
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