question: void onException ( JMSException jE ) { if ( errorHandler != null ) { if ( _logger . isLoggable ( Level . FINE ) ) { _logger . fine ( "calling ExceptionListener.onException(): " + cnxKey ) ; } errorHandler . onException ( jE ) ; } else { if ( _logger . isLoggable ( Level . FINE ) ) { _logger . fine ( "ExceptionListener is not set for connection: " + cnxKey ) ; } } }
target:  Passes an asynchronous exception to the exception listener, if any.