apache-kafka-streams - Spring Cloud Stream 中是否可以有多个@StreamListener？

Question

我使用 Spring cloud strema Kstream。我测试一个主题和一个@StreamListner。没关系。

我修改了两个 KStream 输入的代码。（二@StreamListener）但是，spring cloud 错误..

***************************
APPLICATION FAILED TO START
***************************

Description:

The bean 'stream-builder-process', defined in null, could not be registered. A bean with that name has already been defined in null and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true


Process finished with exit code 1

第一个听众

    package com.kstream.spring.cloud.test1;

    import static com.kstream.spring.cloud.test1.MyBinding.TOPIC1_IN;

    import org.apache.avro.generic.GenericRecord;
    import org.apache.kafka.streams.kstream.KStream;
    import org.springframework.cloud.stream.annotation.Input;
    import org.springframework.cloud.stream.annotation.StreamListener;
    import org.springframework.stereotype.Component;

    @Component
    public class Topic1Source {

      @StreamListener
      public void process(@Input(TOPIC1_IN) KStream<String, GenericRecord> logs) {

        logs
            .foreach((key, value) -> {
              System.out.println("Test Topic1 : " + value);
            });
      }
    }

只有第一个听众是好的。

第二个听众

    package com.kstream.spring.cloud.test1;

    import static com.kstream.spring.cloud.test1.MyBinding.TOPIC2_IN;

    import org.apache.avro.generic.GenericRecord;
    import org.apache.kafka.streams.kstream.KStream;
    import org.springframework.cloud.stream.annotation.Input;
    import org.springframework.cloud.stream.annotation.StreamListener;
    import org.springframework.stereotype.Component;

    @Component
    public class Topic2Source {

      @StreamListener
      public void process(@Input(TOPIC2_IN) KStream<String, GenericRecord> logs) {

        logs
            .foreach((key, value) -> {
              System.out.println("Test Topic2 : " + value);
            });
      }
    }

但这是错误

应用程序属性

spring.application.name=kafka-streams-test
spring.kafka.bootstrap-servers=my brokers

# defaults
spring.cloud.stream.kafka.streams.binder.brokers=my brokers
spring.cloud.stream.kafka.streams.binder.configuration.commit.interval.ms=1000
spring.cloud.stream.kafka.streams.binder.configuration.schema.registry.url=my server


# topic1
spring.cloud.stream.bindings.topic1In.destination=topic1
spring.cloud.stream.bindings.topic1In.consumer.useNativeDecoding=true
spring.cloud.stream.bindings.topic1In.consumer.header-mode=raw
spring.cloud.stream.kafka.streams.bindings.topic1In.consumer.keySerde=org.apache.kafka.common.serialization.Serdes$StringSerde
spring.cloud.stream.kafka.streams.bindings.topic1In.consumer.valueSerde=io.confluent.kafka.streams.serdes.avro.SpecificAvroSerde




# topic2
spring.cloud.stream.bindings.topic2In.destination=topic2
spring.cloud.stream.bindings.topic2In.consumer.useNativeDecoding=true
spring.cloud.stream.bindings.topic2In.consumer.header-mode=raw
spring.cloud.stream.kafka.streams.bindings.topic2In.consumer.keySerde=org.apache.kafka.common.serialization.Serdes$StringSerde
spring.cloud.stream.kafka.streams.bindings.topic2In.consumer.valueSerde=io.confluent.kafka.streams.serdes.avro.SpecificAvroSerde

标签： apache-kafka-streamsspring-cloud-stream

Answer 1

我找到错误原因。因为我定义了两个相同的“进程”方法名称。