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Check HeaderMapper bean with a well known name (#753)

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* Check HeaderMapper bean with a well known name

* If a custom bean name for header mapper is not provided through the binder property headerMapperBeanName,
  then look for a header mapper bean with the name kafkaHeaderMapper.
* Add tests to verify

Resolves #749

* Addressing PR review comments
This commit is contained in:
Soby Chacko
2019-09-27 11:08:15 -04:00
committed by Gary Russell
parent e549090787
commit db5a303431
3 changed files with 203 additions and 28 deletions
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docs/src/main/asciidoc/overview.adoc
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@@ -136,6 +136,7 @@ Default: See individual producer properties.
spring.cloud.stream.kafka.binder.headerMapperBeanName::
The bean name of a `KafkaHeaderMapper` used for mapping `spring-messaging` headers to and from Kafka headers.
Use this, for example, if you wish to customize the trusted packages in a `DefaultKafkaHeaderMapper` that uses JSON deserialization for the headers.
If this custom `KafkaHeaderMapper` bean is not made available to the binder using this property, then the binder will look for a header mapper bean with the name `kafkaBinderHeaderMapper` before falling back to a default header mapper.
+
Default: none.