I verified that the "friendly" form below works w/ 0.7.7:

{:dbname "xe"
 :dbtype "oracle"
 :host "localhost"
 :port 50161
 :user "system"
 :password "oracle"}

{:subprotocol "oracle",
 :classname "oracle.jdbc.OracleDriver",
 :subname "@localhost:50161:xe",
 :user "system",
 :password "oracle"}