What is the closest to ConcurrentHashMap and NavigableMap in Java?

[JN]

On Thursday, 14 November 2013 at 18:08:22 UTC, Jacek 
Furmankiewicz wrote:
> So how do existing D applications (especially the high perf 
> ones in let's say the financial sector) deal with having some 
> part of the data in memory and keeping it in sync with the DB 
> source?

They don't, because there aren't really such apps in the wild yet.