Kafka RebalanceInProgressException: Why It Happens and How to Fix It
Kafka RebalanceInProgressException on commitSync/commitAsync with CooperativeStickyAssignor? Here's why it's not CommitFailedException, and the correct fix.
kafka-errors
61 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.
Kafka "Connection to node -1 could not be established" — Fix
Fix Kafka's "Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available" — the Docker advertised.listeners 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 Connect Task Threw an Uncaught and Unrecoverable Exception
Kafka Connect task killed with 'uncaught and unrecoverable exception'? It's usually a converter poison pill. Here's the DataException root cause, DLQ fix, and design.
Kafka Connect Failed to Flush: Offset Commit Timeout Fix
Kafka Connect source task logs 'Failed to flush, timed out while waiting for producer to flush outstanding N messages'. Here's the real cause and the fix.
Kafka Connect: Failed to Find Any Class That Implements Connector
Kafka Connect throws 'Failed to find any class that implements Connector' when plugin.path is wrong or classloader isolation hides your JAR. Here's the fix.
Kafka SerializationException: Can't Convert Value of Class Fix
Kafka SerializationException: Can't convert value of class X to StringSerializer? The ClassCastException behind it, the config fix, and the safer design.
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.