IllegalStateException - Gopi Gorantala

Kafka: Subscription to Topics, Partitions and Pattern Are Mutually Exclusive

Kafka throws IllegalStateException: Subscription to topics, partitions and pattern are mutually exclusive when you mix subscribe() and assign(). Here's the fix.

Kafka IllegalStateException: No Current Assignment for Partition

Getting java.lang.IllegalStateException: No current assignment for partition on seek()? Why Kafka's lazy assignment causes it — and the correct fix.

Kafka: Cannot Perform Operation After Producer Closed

Kafka IllegalStateException 'Cannot perform operation after producer has been closed' explained: why it happens, the Spring share

Kafka: Consumer Is Not Subscribed to Any Topics — Fix

IllegalStateException: Consumer is not subscribed to any topics or assigned any partitions — why poll() throws it, the subscribe/assign contract, and the fix.