Re: using in-memory data-structures in GWT

There are in-memory RDBMS if you want (H2 for instance).

Otherwise, "public static final" fields and synchronized() blocks all over the place (and/or using a ConcurrentMap implementation –e.g. ConcurrenthashMap– instead of a plain Map –such as HashMap–).

But, you're talking about a "last state saved", so there's some state persisted somewhere?

Anyway, that's nothing specific to GWT; you'd better ask a wider audience re. java web servers (e.g. stackoverflow)

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