Spring for Apache Kafka @SpringOnePlatform
This project is used for the demos; it has a number of Spring Boot applications, demonstrating various capabilities of spring-kafka.
Each application is in package
appX is app1, app2, etc).
Common configuration is in the
The apps require 2 topics to be created in Kafka...
kafka-topics --zookeeper localhost:2181 --create --topic s1p.topic --partitions 5 --replication-factor 1
kafka-topics --zookeeper localhost:2181 --create --topic s1p.fooTopic --partitions 5 --replication-factor 1
The first four apps use
String serializers and deserializers for both the key and value.
This is the first app which simply sends a message to the
This adds a simple
@KafkaListener to receive messages from
s1p.topic in a POJO method.
This shows how to access the partition from which the message was received in a
@KafkaListener POJO method.
This shows a
@KafkaListener where the topics/partitions are explicitly subscribed to, together with an initial offset.
This introduces JSON serializer and deserializer for the value.
JsonConfiguration instead of
CommonConfiguration; note that the type (
Foo) is hard-coded into the deserializer - this is required since the JSON contains no type information.
This is a more flexible alternative to using the Json serializer and deserializer.
Instead, it uses
StringJsonMessageConverter s and reverts to using String serializer/deserializer.
One benefit of this technique is the type used in the conversion is inferred from the method argument type.
Notice that we send a
Foo and receive a
Bar - of course, the types need to have compatible fields.
This builds on
app2 by adding retry and filtering to the listener.
This version of
app2 uses the lower-level
KafkaMessageListenerContainer instead of a
This version of
app8 commits the offsets manually.