cf9d8cd79c
Fixes https://github.com/spring-cloud/stream-applications/issues/500 When `listeners` are provided for `DefaultKafkaConsumerFactory`, the target `KafkaConsumer` instance is proxied. The `java.lang.reflect.Proxy` is `Serializable`, but the value it is wrapping is not. When the `MessageHeaders` is serialized (e.g. into persistent `MessageStore`), it checks for `Serializable` type only on top-level object of the header. Therefore, the `Proxy` is passing condition, but eventually we fail with `NotSerializableException`, since the proxied object is not like that * Remove `kafka_consumer` from a message before it reaches an aggregator with its logic to serialize message into the store This is a workaround until Spring for Apache Kafka is released with the fix: https://github.com/spring-projects/spring-kafka/pull/2822