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https://issues.apache.org/jira/browse/ISIS-2776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Keir Haywood resolved ISIS-2776.
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Resolution: Fixed
> @Parameter(regex=...) does not allow for parameter to also be optional.
> -----------------------------------------------------------------------
>
> Key: ISIS-2776
> URL: https://issues.apache.org/jira/browse/ISIS-2776
> Project: Isis
> Issue Type: Bug
> Components: Isis Core
> Affects Versions: 2.0.0-M5
> Reporter: Daniel Keir Haywood
> Assignee: Daniel Keir Haywood
> Priority: Minor
> Fix For: 2.0.0-M6
>
>
> In other words, if null is provided then the regex fails. It should just
> ignore.
> This shows up as a problem for the simple case, eg:
> `@Parameter(regex=..., optionality=OPTIONAL)`
> it also shows up in the case of a chained meta-annotation:
> {code:java}
> @Parameter(regex=..., optionality=MANDATORY)
> public @interface Reference {}{code}
> and
> {code:java}
> @Parameter(optionality=OPTIONAL)
> @Reference
> public @interface VatCode {} {code}
> where we want parameters annotated with `@VatCode` to be optional, overriding
> the inherited mandatory from `@Reference`.
>
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