*/
public DataWriter create_datawriter(Topic a_topic, DataWriterQos qos,
DataWriterListener a_listener) {
DataWriter DW = null ;
Servant impl;
try{
Class type = Class.forName(a_topic.get_type_name()+"DataWriterImpl") ;
Class typehelper = Class.forName(a_topic.get_type_name()+"DataWriterHelper") ;
Class type_param_constructor [] = new Class[6] ;