There has been a lot of talk about using grids and spaces to handle large scale java applications at The Spring Experience 2007. The compelling thing about this for me is the idea that these applications allow architects to abstract the concept of clustering. Developers can effectively program as if they are running on a single server (with some minor APIs here and there depending on the solution). Most solutions scale up very well and provide failover support.
These solutions are being recommended as production ready solutions and apparently large companies (like banks) are already using them in massive scale production. It will be interesting to see how these impact Java enterprise development in the future.
Here are some of the solutions I heard mentioned at TSE 2007:
Terracota
OpenSpaces (API/aggregation site)
GigaSpaces XAP
Coherence
ObjectGrid
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