 with the ManagedConnection instance; 
        required for the CONNECTION_CLOSED event and optional for the 
        other event types.
    <LI>Optionally, an exception indicating the connection related error. 
        Note that exception is used for CONNECTION_ERROR_OCCURRED.
  </UL>
 
  <p>This class defines following types of event notifications:
  <UL>
     <LI>CONNECTION_CLOSED
     <LI>LOCAL_TRANSACTION_STARTED
     <LI>LOCAL_TRANSACTION_COMMITTED
     <LI>LOCAL_TRANSACTION_ROLLEDBACK
     <LI>CONNEC