Timothy Bish created AMQ-5616:
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Summary: 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
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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