I think it might have been because in the code comments of the EHStore there's a mention that the store is not persistent across JVM restarts, but now it seems they "fixed" it...
http://ehcache.sourceforge.net/documentation/#mozTocId581616
But see also:
"Note: This documentation is being updated for the forthcoming release of Version 1.0 of ehcache. The current release, version 0.9, contains most of the features documented here, with the main exception being persistence DiskStores."
Assuming I interpret this correctly, we could have EHCache as the default cache as soon as it reaches 1.0.
Ugo
