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https://issues.apache.org/jira/browse/OWB-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13986659#comment-13986659
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Mark Struberg commented on OWB-952:
-----------------------------------

Happens because Java8 now compiles the same code to 

{code}
6: invokevirtual #7                  // Method
java/util/concurrent/ConcurrentHashMap.keySet:()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
{code}

due to new inner class ConcurrentHashMap#KeySetView.

> ensure we only use ConcurrentMap and not ConcurrentHashMap API to avoid 
> issues with java 8
> ------------------------------------------------------------------------------------------
>
>                 Key: OWB-952
>                 URL: https://issues.apache.org/jira/browse/OWB-952
>             Project: OpenWebBeans
>          Issue Type: Bug
>    Affects Versions: 1.2.3, 2.0.0
>            Reporter: Romain Manni-Bucau
>
> Currently we use ConcurrentHashMap directly (ie our varaibles/fields). In 
> Java 8 API was broken so we should avoid it and stay hidden behind 
> ConcurrentMap API everuwhere.



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