private void configureDefaultProperties(Map<String, Object> source) {
		// Required Properties
		String groupBindingPropertyName = createBindingPropertyName(INPUT, "group");
		String broadcastingPropertyName = createRocketMQPropertyName(INPUT,
				"broadcasting");
		source.put(groupBindingPropertyName, "rocketmq-bus-group");
		source.put(broadcastingPropertyName, "true");
	}
The name of {@link PropertySource} of {@link SpringApplication#defaultProperties}.
spring-cloud-alibaba-starters/spring-cloud-starter-bus-rocketmq/src/main/java/com/alibaba/cloud/bus/rocketmq/env/RocketMQBusEnvironmentPostProcessor.java