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https://issues.apache.org/jira/browse/WICKET-3209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-3209.
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       Resolution: Fixed
    Fix Version/s: 1.5-M4

With r1049077 a special map is introduced which extends MostRecentlyUsedMap to 
be able to store at most N entries and additionally have the feature to expire 
its entries after a specified duration.

> WebApplication MostRecentlyUsedMap based upon Key age not Value age
> -------------------------------------------------------------------
>
>                 Key: WICKET-3209
>                 URL: https://issues.apache.org/jira/browse/WICKET-3209
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-auth-roles
>    Affects Versions: 1.5-M3
>         Environment: all
>            Reporter: Richard Emberson
>            Assignee: Martin Grigorov
>            Priority: Minor
>             Fix For: 1.5-M4
>
>
> The WebApplication uses the MostRecentlyUsedMap as a limited size cache. 
> Elements of
> the cache are removed when a new entry is added based upon the age of the 
> element's keys
> not on the age of the element's data.
> Naively, I would expect a high usage element (one's whose associated data 
> keeps changing)
> should be kept in the cache rather than reaped - simply because it was enter 
> earlier than some
> low activity but more recent entry.
> The MostRecentlyUsedMap is based upon the Java LinkedHashMap container. 
> As such, it is not a very good fit for data-based age cache.
> Of course I could be completely wrong in this case and it actually the age of 
> the key that is
> important not how often the data associated with the key is changed.

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