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The {{java.util.Collections}} interface's documentation \[[API 06|AA. Java References#API 06]\] warns about the consequences of failing to synchronize on theany view over a collection object: |
It is imperative that the user manually synchronize on the returned map when iterating over any of its collection views... Failure to follow this advice may result in non-deterministic behavior.
Synchronize on the original Collection object when using synchronization wrappers. This synchronization is necessary to enforce atomicity (CON07-J. Do not assume that a grouping of calls to independently atomic methods is atomic).
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This compliant solution synchronizes on the original Collection object map instead of the Collection view set.
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