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https://issues.apache.org/struts/browse/WW-2506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Don Brown updated WW-2506:
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Fix Version/s: 2.1.2
> ControllerClasspathPackageProvider causes duplicate package error
> -----------------------------------------------------------------
>
> Key: WW-2506
> URL: https://issues.apache.org/struts/browse/WW-2506
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - REST
> Affects Versions: 2.1.0
> Reporter: Jeromy Evans
> Assignee: Don Brown
> Fix For: 2.1.2
>
>
> If a REST Controller (aka action) implements Action or is annotated with
> @Action, the CodeBehind PackageProvider and the REST PackageProvider both
> attempt to create the parent package. This results in a duplicate package
> error while building the configuration:
> ...
> Caused by: The package name 'mypackage.actions.parent' at location null is
> already been used by another package at location null
> The reason is that CodeBehind's ClasspathPackageProvider detects the action
> and configures the parent package, and the ControllerClasspathPackageProvider
> (re)detects the Controller and configures the parent package.
> As it exists, this will be a common error as uses may tend to extend
> ActionSupport to access ValidationAwareSupport and TextProviderSupport within
> a Controller.
> Possible resolutions:
> - REST plugin does not configure Controllers that are also Actions; or
> - REST plugin provides unique names for the parent packages it creates
> (currently it uses the java package name)
> I prefer the latter but aren't sure of the implications. The change would
> also impact the CodeBehind.
> I believe this only affects 2.1.1+ due to the strict configuration. It can
> be replicated by changing the rest-showcase Controller to extend
> ActionSupport rather than ValidationAwareSupport.
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