找不到Spring kafka AVRO生成的类

Question

我正在使用confluent JDBC连接器连接到postgres数据库，以检索更改并将其放在Kafka主题中。现在，我想使用spring boot消费者来使用这些消息。这些消息采用AVRO格式。我从连接器中获得了模式，并使用avro-maven插件为其生成了一个POJO类。

但是当侦听器启动时，只有以下错误

   java.lang.IllegalStateException: This error handler cannot process 'SerializationException's directly; please consider configuring an 'ErrorHandlingDeserializer' in the value and/or key deserializer
       at org.springframework.kafka.listener.SeekUtils.seekOrRecover(SeekUtils.java:194) ~[spring-kafka-2.7.2.jar:2.7.2]
       at org.springframework.kafka.listener.SeekToCurrentErrorHandler.handle(SeekToCurrentErrorHandler.java:112) ~[spring-kafka-2.7.2.jar:2.7.2]
       at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.handleConsumerException(KafkaMessageListenerContainer.java:1598) ~[spring-kafka-2.7.2.jar:2.7.2]
       at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:1210) ~[spring-kafka-2.7.2.jar:2.7.2]
       at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
       at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
       at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
   Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition ps_git_repo-0 at offset 0. If needed, please seek past the record to continue consumption.
   Caused by: org.apache.kafka.common.errors.SerializationException: Could not find class ps_git_repo specified in writer's schema whilst finding reader's schema for a SpecificRecord.

当我不使用avro对数据进行反序列化时，我会收到数据但不可读。

在pom中。xml我有以下依赖项

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.kafka</groupId>
        <artifactId>spring-kafka</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.apache.avro</groupId>
        <artifactId>avro</artifactId>
        <version>1.10.2</version>
    </dependency>
    <dependency>
        <groupId>io.confluent</groupId>
        <artifactId>kafka-avro-serializer</artifactId>
        <version>6.2.0</version>
        <exclusions>
            <exclusion>
                <artifactId>netty</artifactId>
                <groupId>io.netty</groupId>
            </exclusion>
        </exclusions>
    </dependency>

在应用程序中。属性我添加了反序列化器和架构注册表url。

    spring.kafka.consumer.key-deserializer = org.apache.kafka.common.serialization.StringDeserializer
    spring.kafka.consumer.value-deserializer = io.confluent.kafka.serializers.KafkaAvroDeserializer
    spring.kafka.bootstrap-servers = http://localhost:9092
    spring.kafka.consumer.properties.specific.avro.reader = true
    spring.kafka.consumer.properties.schema.registry.url = http://localhost:8081

在构建中，我使用avro-maven插件从连接器创建的模式生成POJO。

pom中的插件。xml

    <plugin>
        <groupId>org.apache.avro</groupId>
        <artifactId>avro-maven-plugin</artifactId>
        <version>1.10.2</version>
        <executions>
            <execution>
                <phase>generate-sources</phase>
                <goals>
                    <goal>schema</goal>
                </goals>
                <configuration>
                    <sourceDirectory>${project.basedir}/src/main/avro/</sourceDirectory>
                    <outputDirectory>${project.basedir}/src/main/java/</outputDirectory>
                    <stringType>String</stringType>
                </configuration>
            </execution>
        </executions>
    </plugin>

我已将以下模式放入文件夹，并使用mvn generate sources生成pojo

架构。avsc公司

    {
      "connect.name": "ps_git_repo",
      "fields": [
        {
          "name": "id",
          "type": "long"
        },
        {
          "default": null,
          "name": "name",
          "type": [
            "null",
            "string"
          ]
        }
      ],
      "name": "ps_git_repo",
      "namespace": "com.company.api.kafkademo",
      "type": "record"
    }

我得到了ps\u git\u回购。java类，然后我有这个侦听器来检索消息。

    @SpringBootApplication
    @EnableKafka
    public class KafkaDemoApplication {
    
        @KafkaListener(groupId = "test123", topics = "ps_git_repo_test")
        public void handleMessage(ps_git_repo message) {
            System.out.println(message);
        }
    
        public static void main(String[] args) {
            SpringApplication.run(KafkaDemoApplication.class, args);
        }
    
    }

找不到架构。

有人知道怎么了吗？

Answer 1

反序列化程序使用了connect。名称字段而不是命名空间，以查找正确的类。

我在JDBC\U连接器的配置中添加了以下几行代码，以便连接器生成正确的名称空间

"transforms":"AddNamespace",
"transforms.AddNamespace.type":"org.apache.kafka.connect.transforms.SetSchemaMetadata$Value",
"transforms.AddNamespace.schema.name": "com.company.api.kafkademo.ps_git_repo"