Interface as a return type in EJB Method

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JSP

EJB

Dear All,

Can Interface as a return type in EJB method, because i m trying it but java class not deploy.
Interface means ResultSet,Connections not user define interfaces.

example
@WebMethod(operationName = "MethodName")
public Connection MethodName(@WebParam(name = "username") String username)
{
Connection conn;
..............
return conn;
}

but i m trying to deploy but it not deploy in glassfish server.

Thanks all
Sushant