在Stream中是否可能有多个@StreamListener？

Question

我用春云条纹Kstream。我测试一个主题&一个@StreamListner。没事的。

我为两个KStream输入修改我的代码。(两个@StreamListener)但是，弹簧云错误..。

***************************
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);
            });
      }
    }

只有第一个侦听器是可以的。

第二听者

    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

application.properties

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

Answer 1

我找到了错误的原因。因为我定义了两个相同的方法名'process‘。

Answer 2

您需要为两个输入提供单独的应用程序id。参见this问题和答案。

Answer 3

我修改pom.xml版本。起作用了。但是这个版本不使用应用程序id的属性。

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <!--<version>2.1.3.RELEASE</version>-->
        <version>2.0.1.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>


    <properties>
        <java.version>1.8</java.version>
        <!--<spring-cloud.version>Greenwich.SR1</spring-cloud.version>-->
        <spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version>
    </properties>

春-启动-启动-父版本

• 2.1.3.防止=>错误
• 2.0.1. Working快照=>工作

spring-cloud.version

• Greenwich.SR1 =>误差
• Working快照=>工作

我不明白为什么最新版本不起作用。