private void addDefaultPropertySource(ConfigurableEnvironment environment) {

		Map<String, Object> map = new HashMap<String, Object>();

		configureDefaultProperties(map);

		addOrReplace(environment.getPropertySources(), map);
	}
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