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https://issues.apache.org/jira/browse/QPID-6014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14100978#comment-14100978
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ASF subversion and git services commented on QPID-6014:
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Commit 1618690 from [~godfrer] in branch 'qpid/trunk'
[ https://svn.apache.org/r1618690 ]
QPID-6014 : [Java] declare variables as ConcurrentMap not ConcurrentHashMap to
avoid linking issues after compiling under Java 8
> [Java] Declare variables as ConcurrentMap not ConcurrentHashMap to avoid
> issues afetr compiling on Java 8
> ---------------------------------------------------------------------------------------------------------
>
> Key: QPID-6014
> URL: https://issues.apache.org/jira/browse/QPID-6014
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker, Java Client, Java Common
> Reporter: Rob Godfrey
> Assignee: Rob Godfrey
> Fix For: 0.31
>
>
> 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.
> Avoid these issues by always declaring variables in terms of the interface
> ConcurrentMap
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