Java ConcurrentModificationException: Causes and Fixes
ConcurrentModificationException usually has nothing to do with threads. Here is exactly what modCount does, why it fires, and the four fixes that actually work.
concurrentmodificationexception
2 PostsFix KafkaConsumer Is Not Safe for Multi-Threaded Access
Hitting ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access? Here's why the thread guard fires and the correct fix.