[jira] [Created] (GROOVY-7882) NullPointerException in List.toUnique if one element is null

["Alexander Franke (JIRA)" <ji...@apache.org>]

Alexander Franke created GROOVY-7882:
----------------------------------------

             Summary: 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


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.
```
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)
```

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]
```



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