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https://issues.apache.org/jira/browse/ISIS-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17362257#comment-17362257
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Andi Huber commented on ISIS-2737:
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java.lang.IllegalStateException: [1] Collection action parameter found that is 
not exactly one of the following supported types: List, Set, SortedSet, 
Collection or Array.  Class: org.apache.isis.com
mons.collections.Can action: Starts With parameter 0
[2] Collection action parameter found that is not exactly one of the following 
supported types: List, Set, SortedSet, Collection or Array.  Class: 
org.apache.isis.commons.collections.Can action: Is E
qual To parameter 0
[3] Collection action parameter found without supporting choices or 
autoComplete facet.  Class: org.apache.isis.commons.collections.Can action: 
Pick By Index parameter 0
[4] Collection action parameter found without supporting choices or 
autoComplete facet.  Class: org.apache.isis.commons.collections.Can action: To 
Array parameter 0
[5] Collection action parameter found that is not exactly one of the following 
supported types: List, Set, SortedSet, Collection or Array.  Class: 
org.apache.isis.commons.collections.Can action: Ends

> Metamodel: accept Can<T> as vector type (along java.util.Collection)
> --------------------------------------------------------------------
>
>                 Key: ISIS-2737
>                 URL: https://issues.apache.org/jira/browse/ISIS-2737
>             Project: Isis
>          Issue Type: Improvement
>          Components: Isis Core
>            Reporter: Andi Huber
>            Assignee: Andi Huber
>            Priority: Major
>             Fix For: 2.0.0-M6
>
>
> eg. UserMemento#getRoles() : Can<RoleMemento> fails with see comment ...



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