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i have come up recently with a couple of cases where i wanted to
auto-generate a composite key. in both these cases i wanted to generate the IDs within hibernate, but hibernate won't let me do that for a composite key (cannot specify a generator). i poked around in the code and discovered that there is nothing programatically preventing this, it's only the dtd that stops it. so i modified the dtd and tried it out and it works just fine, in both cases.

is there something i am not seeing about allowing composite keys to be generated that makes it a bad idea?

have you got an answer to your question ? I have of legacy tables with composite keys and wish I had a genertor for it ...