[Using ConcurrentMessageListenerContainer](https://docs.spring.io/spring-kafka/reference/kafka/receiving-messages/message-listener-container.html#using-ConcurrentMessageListenerContainer) section starts with: > The single constructor is similar to the KafkaListenerContainer constructor. Then just below: > For the first constructor, Kafka distributes the partitions across the consumers using its group management capabilities. Probably there were multiple constructors in older versions, but there is a single constructor now.