Async suspend function listener not automatically acknowledged? #3740
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This is a bug after #1189. |
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… functions Fixes: spring-projects#3740 Issue link: spring-projects#3740 Even if Kotlin `suspend` functions are called properly, the acknowledgement is not called because this kind of method is not treated as an `asyncReplies` mode * Fix `HandlerAdapter` to check for `KotlinDetector.isSuspendingFunction()` in addition to `CompletableFuture` & `Mono` * Adjust `EnableKafkaKotlinCoroutinesTests.kt` to verify that `acknowledgement` has been called by the Framework **Auto-cherry-pick to `3.3.x` & `3.2.x`**
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Fixes: #3740 Issue link: #3740 Even if Kotlin `suspend` functions are called properly, the acknowledgement is not called because this kind of method is not treated as an `asyncReplies` mode * Fix `HandlerAdapter` to check for `KotlinDetector.isSuspendingFunction()` in addition to `CompletableFuture` & `Mono` * Adjust `EnableKafkaKotlinCoroutinesTests.kt` to verify that `acknowledgement` has been called by the Framework **Auto-cherry-pick to `3.2.x`** # Conflicts: # spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/HandlerAdapter.java
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Fixes: #3740 Issue link: #3740 Even if Kotlin `suspend` functions are called properly, the acknowledgement is not called because this kind of method is not treated as an `asyncReplies` mode * Fix `HandlerAdapter` to check for `KotlinDetector.isSuspendingFunction()` in addition to `CompletableFuture` & `Mono` * Adjust `EnableKafkaKotlinCoroutinesTests.kt` to verify that `acknowledgement` has been called by the Framework # Conflicts: # spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/HandlerAdapter.java (cherry picked from commit 914cf62)
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Discussed in #3739
Originally posted by rbraeunlich February 13, 2025
Hi everyone,
I was wondering about an error in my application (not part of my question). While trying to simplyfy my code, e.g. by using a
suspendfunction in my listener, which is now being supported, I tried to find out if I have to do theackby myself. I checked the documentation and also found this earlier question: #3290This indicates that I don't have to do the
ackmyself. Nevertheless, when debugging my integration tests I could see that the first message never was acknowledged. When doing it myself, all tests pass.The critical part seems to be this line:
https://github.com/spring-projects/spring-kafka/blob/main/spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/MessagingMessageListenerAdapter.java#L553
My suspend function doesn't return anything and therefore the adapter doesn't do the ack for me. The documentation only states "return types include CompletableFuture, Mono and Kotlin suspend functions". Not that my suspend function has to return anything.
Additionally, if I was to return a
kotlinx.coroutines.Joborkotlinx.coroutines.Deferredthe helper inorg.springframework.kafka.listener.adapter.AdapterUtils#isAsyncReplywouldn't recognize them because it only checks forMonoandCompletableFuture.So, I wonder if the documentation here needs to be more specific or if the code is wrong.
Cheers,
Ronny
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