I do not see an ability for Confluence to use Oracle. Is it supported?
See http://confluence.atlassian.com/display/DOC/Supported+Platforms</p<>>
If you're just running a demo version then maybe you don't have the drivers installed? You'll have to download these yourself from Oracle.
See Nic's link for what version is supported & this ones for how to set it up.
http://confluence.atlassian.com/display/DOC/Database+Setup+for+Oracle
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