Prevayler looks like an interesting solution for small scale object persistence in Java.
There are a couple of articles about it over on Advogato.
The big problem with this so far as I'm concerned, is that everything is kept in RAM (like Gadfly). They can talk about Breakthroughs In Memory Technologyand servers with multi-gigabyte RAM, but I'm used to working with multi-gigabyte databases, and in the real world, you just don't have that kind of RAM available.
I'd like to give it a try for something small, though.
Posted to Java by Simon Brunning at May 16, 2002 01:01 PMI thought the big "thing" with these types of systems was noting that with modern virtual memory systems, "RAM" is really the size of your swap space, not the size of your actual RAM.
That is, instead of counting on a database-like
system to punt things in and out of memory, a "prevalayor" approach counts on the VM system to do that...