I have had no problems using the jca support since 2.2.2, although I recommend using rabbithole or at least 2.4. In 2.2.2 you have to deploy your adapters by hand which is annoying to say the least.
If you are specific about the problems you are having and what you have tried you are more likely to get useful help.
btw in rabbithole (cvs version) all db access is through jca and jdbc adapter rars.
What connector are you trying to use?