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https://issues.apache.org/jira/browse/GROOVY-8186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-8186.
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> Builder ExternalStrategy constructors have trouble with private fields
> ----------------------------------------------------------------------
>
>                 Key: GROOVY-8186
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8186
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.4.x, 2.5.x
>            Reporter: Jason Terhune-Wold
>            Assignee: Paul King
>            Priority: Minor
>             Fix For: 2.5.0-beta-2
>
>
> An undocumented feature of @Builder is that the builder's constructor can set 
> default values for the fields. See 
> http://stackoverflow.com/questions/35066664/default-values-in-groovy-builder-ast
> I tried creating an ExternalStrategy @Builder annotation for 
> [BaseClientDetails|http://docs.spring.io/spring-security/oauth/apidocs/org/springframework/security/oauth2/provider/client/BaseClientDetails.html]
>  with a constructor that set a default scope. I received a 
> MissingMethodException exception, which I thought was odd.
> I added some tests to BuilderTransformTest that demonstrate apparent problems 
> using the external builder in two situations:
> 1) A groovy class with private fields and manually defined setters.
> 2) A java class with a private Set field and a setter that takes a Collection
> The tests are here: 
> https://github.com/jterhune/groovy/commit/5b2eb74cc8184235b5235b7fd4c80b241799bbc5
> I noticed this in 2.4.x. My tests fail in the 2.5.x branch also.



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