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https://issues.apache.org/jira/browse/ISIS-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187364#comment-16187364
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Dan Haywood commented on ISIS-1741:
-----------------------------------

What must be happening is that a new class or type (ObjectSpecification in the 
metamodel API) is being discovered during the course of running the validators.

The cheap-n-cheerful fix is to take a copy of "allSpecifications" on ~ line 555 
of  DomainObjectAnnotationFacetFactory

https://github.com/apache/isis/blob/5b86f37edbc5cf2e9ae98f6898bcefd3e842983a/core/metamodel/src/main/java/org/apache/isis/core/metamodel/facets/object/domainobject/DomainObjectAnnotationFacetFactory.java#L555

> ConcurrentModificationException during startup when launching packaged webapp 
> with jetty
> ----------------------------------------------------------------------------------------
>
>                 Key: ISIS-1741
>                 URL: https://issues.apache.org/jira/browse/ISIS-1741
>             Project: Isis
>          Issue Type: Bug
>    Affects Versions: 1.15.0
>            Reporter: Vladimir Nisevic
>         Attachments: 1741_applog.txt
>
>
> I get this exception (see attachment [^1741_applog.txt]) only when launching 
> the version packaged with jetty, exception doesn't occur when launching 
> within IDE (IntelliJ).
> Maybe any idea? Not sure how could I reproduce it with simpleapp....



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