chia7712 commented on PR #15968:
URL: https://github.com/apache/kafka/pull/15968#issuecomment-2960196323
> Does the test delete and recreate the same topic?
I write a rough test according to this comment, and it does reproduce the
NPE.
```
public void test(ClusterInstance clusterInstance) {
var topic = "chia";
var f = CompletableFuture.runAsync(() -> {
try (var admin = clusterInstance.admin()) {
for (int i = 1; i <= 1000; i++) {
try {
admin.deleteTopics(List.of(topic)).all().get();
} catch (Exception ignore) {
}
try {
admin.createTopics(List.of(new NewTopic(topic, 10,
(short) 1))).all().get();
} catch (Exception ignore) {
}
}
}
});
try {
var fs = IntStream.range(0, 10).mapToObj(ignored ->
CompletableFuture.runAsync(() -> {
try (var producer = clusterInstance.producer()) {
for (int i = 1; i <= 1000; i++) {
producer.send(new ProducerRecord<>(topic,
"value".getBytes()));
}
}
})).toList();
fs.forEach(CompletableFuture::join);
} finally {
f.join();
}
}
```
```
[2025-06-11 02:08:07,497] ERROR [Producer clientId=producer-5] Uncaught
error in request completion: (org.apache.kafka.clients.NetworkClient:671)
java.lang.NullPointerException: Cannot invoke
"org.apache.kafka.clients.producer.internals.ProducerBatch.hasReachedDeliveryTimeout(long,
long)" because "batch" is null
at
org.apache.kafka.clients.producer.internals.Sender.canRetry(Sender.java:835)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.producer.internals.Sender.completeBatch(Sender.java:669)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.producer.internals.Sender.lambda$handleProduceResponse$2(Sender.java:613)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596) ~[?:?]
at
org.apache.kafka.clients.producer.internals.Sender.lambda$handleProduceResponse$3(Sender.java:597)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[?:?]
at
org.apache.kafka.clients.producer.internals.Sender.handleProduceResponse(Sender.java:597)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.producer.internals.Sender.lambda$sendProduceRequest$9(Sender.java:895)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.ClientResponse.onComplete(ClientResponse.java:154)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.NetworkClient.completeResponses(NetworkClient.java:669)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:661)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:340)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:255)
~[kafka-clients-4.1.0-SNAPSHOT.jar:?]
at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
```
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