Creation of DataWriter for HelloPublisher

HelloPublisherDataWriter.java

// Create the data writer using the default publisher
StringDataWriter dataWriter = (StringDataWriter)participant.create_datawriter(
	helloWorldTopic, 			// Topic	
	Publisher.DATAWRITER_QOS_DEFAULT,	// QoS				
	null, 					// listener
	StatusKind.STATUS_MASK_NONE);		// mask
if (dataWriter == null) {
	System.err.println("Unable to create data writer\n");
	return;
}