无法在春季云kafka中按主题/活页夹级别设置Serde，生产者和消费者属性

Question

我正在尝试使用Spring Cloud Kafka活页夹启动简单的发布订阅应用程序。但是，我无法在application.yml中设置序列化程序，DeSerialzer属性以及其他生产者和使用者属性。我始终收到序列化/反序列化错误。甚至在春季启动项目中的kafka日志显示，生产者和使用者配置仍在使用ByteArraySerializer。下面是代码相同。

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>io.github.kprasad99.kafka</groupId>
    <artifactId>kp-kafka-streams-example</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>kp-kafka-streams-example</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-streams</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
        </dependency> -->

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-test-support</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Processor.java

public interface Processor {

    String INPUT="k-msg-source";
    String OUTPUT="k-msg-sink";

    @Input(INPUT)
    SubscribableChannel input();

    @Output(OUTPUT)
    MessageChannel output();

}

KRest.java

@ RestController公共课程KRest {

@Autowired
private Processor processor;

@GetMapping("/send")
public ResponseEntity<Void> send(@RequestParam("key")String key, @RequestParam("msg") String text){
    processor.input().send(MessageBuilder.withPayload(Message.builder().text(text).build()).setHeader(KafkaHeaders.MESSAGE_KEY, key).build());
    return ResponseEntity.ok().build();
}

}

Message.java

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Message {

    private String text;
}

最后是application.yml

spring:
  cloud:
    stream:
      bindings:
        k-msg-source:
          binder: kafka
          content-type: application/json
          destination: topic.kp.msg
          group: kp.msg.source
        k-msg-sink:
          binder: kafka
          content-type: application/json
          destination: topic.kp.msg
          group: kp.msg.sink
          producer:
            partition-count: 10
      binders:
        kafka:
          type: kafka
          environment:
            spring.cloud.stream.kafka.binder:
              brokers: localhost:9092
              configuration:
                value.serde: JsonSerde
                key.serde: StringSerde
              producer:
                value.serde: JsonSerde
                key.serde: StringSerde
              replication-factor: 1

版本

• spring-boot：2.2.4
• spring-cloud：Hoxton.SR1
• spring-cloud-stream-kafka-binder：3.0.1

Answer 1

[Serde被Kafka Streams binder使用。

使用MessageChannel binder，属性是MessageChannel，value.serializer（和value.deserializer）以及key...。

您还必须指定类的完全限定名称。

Answer 2

最终key/value.deserializer

application.yml