To use sql authenticator in weblogic server security realm, read following blog post: SQLAuthenticator
For each group in your SQLAuthenticator provider in weblogic console, create an equivalent application role in jazn.xml, and recreate those roles in the Enterprise Roles in jazn.xml. In jazn,xml make enterprise role as member of the appropriate application role. There is no need to create user in jazn.xml file. Crating role will do the work.