new  ThisLibrarySession (username, password)

     public   class  TracingIH  implements  InvocationHandler
    {
         public   static  Object createProxy(Object obj, PrintWriter out)
        {
             return  Proxy.newProxyInstance(obj.getClass().getClassLoader(),
                                          obj.getClass().getInterfaces(),
                                           new  TracingIH(obj, out));
        }

         private  Object target;
         private  PrintWriter out;

         private  TracingIH(Object obj, PrintWriter out)
        {
            target = obj;
             this .out = out;
        }

         public  Object invoke(Object proxy, Method method, Object[] args)
                 throws  Throwable
        {
            Object result =  null ;
             try 
            {
                out.println(method.getName() + "(...) called");
                result = method.invoke(target, args);
            }
             catch  (InvocationTargetException e)
            {
                out.println(method.getName() + " throws " + e.getCause());
                 throw  e.getCause();
            }
            out.println(method.getName() + " returns");
             return  result;
        }
    }

Connection conn = DriverManager.getConnection ("jdbc:oracle:траляля");

Connection conn = TracingIH.createProxy("user", "pass", "url");

 public   class  TracingIH  implements  InvocationHandler
    {
         public   static  Object createProxy(String user, String pass, String url)
        {
            Conenction conn = DriverManager.getConnection(url, user, pass);
             return  Proxy.newProxyInstance(conn.getClass().getClassLoader(),
                                          conn.getClass().getInterfaces(),
                                           new  TracingIH(conn, out));
        }

         private  Object target;
         private  PrintWriter out;

         private  TracingIH(Object obj, PrintWriter out)
        {
            target = obj;
             this .out = out;
        }

         public  Object invoke(Object proxy, Method method, Object[] args)
                 throws  Throwable
        {
            Object result =  null ;
             try 
            {
                // своя логика.
                out.println(method.getName() + "(...) called");
                //вызов на стандартном Connection
                result = method.invoke(target, args);
            }
             catch  (InvocationTargetException e)
            {
                out.println(method.getName() + " throws " + e.getCause());
                 throw  e.getCause();
            }
            out.println(method.getName() + " returns");
             return  result;
        }
    }