@Override
	public void postProcessEnvironment(ConfigurableEnvironment environment,
			SpringApplication application) {

		addDefaultPropertySource(environment);

	}
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