@Override
    public String toString() {
        return "DefaultListenerContainer{" +
                "name='" + name + '\'' +
                ", running=" + running +
                ", accessKey='" + accessKey + '\'' +
                ", secretKey='" + secretKey + '\'' +
                ", endpoints='" + endpoints + '\'' +
                ", consumerGroup='" + consumerGroup + '\'' +
                ", tag='" + tag + '\'' +
                ", topic='" + topic + '\'' +
                ", type='" + type + '\'' +
                ", filterExpressionType=" + filterExpressionType +
                ", requestTimeout=" + requestTimeout +
                ", maxCachedMessageCount=" + maxCachedMessageCount +
                ", maxCacheMessageSizeInBytes=" + maxCacheMessageSizeInBytes +
                ", consumptionThreadCount=" + consumptionThreadCount +
                ", namespace='" + namespace + '\'' +
                '}';
    }
The name of the DefaultRocketMQListenerContainer instance
rocketmq-v5-client-spring-boot/src/main/java/org/apache/rocketmq/client/support/DefaultListenerContainer.java