lucasbru commented on PR #15968:
URL: https://github.com/apache/kafka/pull/15968#issuecomment-2935052103
@OmniaGM Hey, I detected the following NPE during Kafka Streams soak testing
(on trunk):
```
[2025-05-29 04:06:05,855] ERROR [kafka-producer-network-thread |
i-07bbab180f6062ba3-StreamThread-3-producer] [Producer
clientId=i-07bbab180f6062ba3-StreamThread-3-producer] Uncaught error in request
completion: (org.apache.kafka.clients.NetworkClient)
java.lang.NullPointerException: Cannot read field "topicPartition" because
"batch" is null
at
org.apache.kafka.clients.producer.internals.TransactionManager.handleCompletedBatch(TransactionManager.java:748)
at
org.apache.kafka.clients.producer.internals.Sender.completeBatch(Sender.java:736)
at
org.apache.kafka.clients.producer.internals.Sender.completeBatch(Sender.java:710)
at
org.apache.kafka.clients.producer.internals.Sender.lambda$handleProduceResponse$2(Sender.java:613)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at
org.apache.kafka.clients.producer.internals.Sender.lambda$handleProduceResponse$3(Sender.java:597)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at
org.apache.kafka.clients.producer.internals.Sender.handleProduceResponse(Sender.java:597)
at
org.apache.kafka.clients.producer.internals.Sender.lambda$sendProduceRequest$9(Sender.java:895)
at
org.apache.kafka.clients.ClientResponse.onComplete(ClientResponse.java:154)
at
org.apache.kafka.clients.NetworkClient.completeResponses(NetworkClient.java:669)
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:661)
at
org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:340)
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:242)
at java.base/java.lang.Thread.run(Thread.java:840)
```
It seems likely to me that this may be caused by this PR, given the changes
in `Sender.handleProduceResponse`. Could be a race-condition around topic
metadata, but I don't understand the details well enough to fix it myself.
Could you please take a look?
cc @jolshan
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