Kafkaconsumer is not safe for multi-threading access

[ayush11-96]

In what version(s) of Spring for Apache Kafka are you seeing this issue?

For example:

2.8.5

Describe the bug

Caused by: java.util.ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access
at org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:2464)
at org.apache.kafka.clients.consumer.KafkaConsumer.acquireAndEnsureOpen(KafkaConsumer.java:2448)
at org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(KafkaConsumer.java:950)
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.subscribeOrAssignTopics(KafkaMessageListenerContainer.java:1141)
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.(KafkaMessageListenerContainer.java:784)
at org.springframework.kafka.listener.KafkaMessageListenerContainer.doStart(KafkaMessageListenerContainer.java:350)
at org.springframework.kafka.listener.AbstractMessageListenerContainer.start(AbstractMessageListenerContainer.java:466)
at org.springframework.kafka.listener.ConcurrentMessageListenerContainer.doStart(ConcurrentMessageListenerContainer.java:209)
at org.springframework.kafka.listener.AbstractMessageListenerContainer.start(AbstractMessageListenerContainer.java:466)

To Reproduce
During app startup

[sobychacko]

2.8.x is an older release and out of OSS support. See the support timeline: https://spring.io/projects/spring-kafka#support

Please update to a supported OSS version and see if the problem persists.

[ayush11-96]

currently we are on 3.0.1 for some components but still getting the same issues

[artembilan]

OK. The 3.0.1 is still one of those out of support, but if you confirm that the problem is there even if supported version, we would like to ask you for a minimal project to reproduce on our side.
Never seen that error, so feels like something else is going on in your own project.