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https://issues.apache.org/jira/browse/AMQ-5616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timothy Bish resolved AMQ-5616.
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Resolution: Fixed
Fixed on master.
> Declare variables as ConcurrentMap not ConcurrentHashMap to avoid issues
> after compiling on Java 8
> --------------------------------------------------------------------------------------------------
>
> Key: AMQ-5616
> URL: https://issues.apache.org/jira/browse/AMQ-5616
> Project: ActiveMQ
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 5.11.1
> Reporter: Timothy Bish
> Assignee: Timothy Bish
> Priority: Minor
> Fix For: 5.12.0
>
> Attachments: AMQ5616.patch
>
>
> Java 8 redefines the method keySet() on ConcurrentHashMap to return a
> narrower type than the standard return type given in the Map interface. If
> the code is compiled in Java 8 and then run under Java 7 this causes linking
> issues. We don't depend on the narrowed type and can live with the standard
> for our usages of ConcurrentHashMap
> We can avoid these issues by always declaring the instances of
> ConcurrentHashMap where we need method like putIfAbsent in terms of the
> interface ConcurrentMap
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