cache confusion

[Will Jaynes]

I find that I'm just not understanding how the cache works, or the 
proper way to work with it.

I use the ODMG api in a web application. I thought I had read here on 
the email list that the cache was used within a transaction but that it 
was cleared after the transaction ended. But I found that some of my 
dropdown boxes were not being updated because they were being pulled 
from the cache, eventhough they were being retreived within a separate 
transaction. This was unexpected.

So I switched to using the ObjectCacheEmptyImpl until I understood 
caching better. But *even* *then* I found that objects were not always 
refreshed from the database. This was *totally* unexpected.

I finally had to put a broker.clearCache() just after opening my 
transactions in order to guarantee that I actually pulled from the database.

Clearly, I'm not doing or understanding something properly. I've read 
the cache html docs, but perhaps someone could talk about the cache and 
how to work with it successfully.

Thanks, Will

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