Description
I'm been reading available documentation and I am very confused about the correct approach to get an error topic working when using the Kafka binder.
The current documentation states that the property spring.cloud.stream.bindings.error.destination can be used to configure a global error topic, but this support appears to have been removed in this commit.
I have also tried to implement using properties for the Kafka binder specifically; the code below demonstrates my attempt, including the configuration.
My Maven BOM is org.springframework.cloud:spring-cloud-dependencies:Greenwich.SR1 and my dependencies are:
org.springframework.boot:spring-boot-starter-web
org.springframework.cloud:spring-cloud-stream
org.springframework.cloud:spring-cloud-starter-stream-kafka
It would be great if it could be clarified how exactly a global error topic can be set up. So far, with the code below, I can see the message being handled multiple times via retries, but nothing is sent to the error topic (DLQ) that I have configured.
@SpringBootApplication
@EnableBinding(Processor.class)
public class Application {
public static void main(final String[] args) {
SpringApplication.run(Application.class, args);
}
}
@Configuration
public class AppConfig {
@Bean
public ServiceImpl service() {
return new ServiceImpl();
}
@Bean
public Function<String, String> execute(ServiceImpl service) {
return service::doBusinessLogic;
}
}
public class ServiceImpl {
public String doBusinessLogic(String message) {
System.out.println("Handling message");
if (message.startsWith("foo")) {
throw new RuntimeException("This is a test");
}
return message;
}
}
spring:
cloud:
stream:
kafka:
binder:
brokers: localhost:9091
autoCreateTopics: false
bindings:
input:
consumer:
enableDlq: true
dlqName: myErrorTopic
bindings:
input:
destination: myInputTopic
group: myConsumerGroup
output:
destination: myOutputTopic
function:
definition: execute