Question

我正在使用spring-integration-kafka组件，当尝试启动我的上下文时，我将检索以下错误：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '(inner bean)#1ae8bcbc': 
Unsatisfied dependency expressed through constructor argument with index 3 of type [org.apache.kafka.common.serialization.Serializer]: 
Could not convert constructor argument value of type [org.springframework.integration.kafka.serializer.avro.AvroReflectDatumBackedKafkaEncoder] 
to required type [org.apache.kafka.common.serialization.Serializer]: Failed to convert value of type 'org.springframework.integration.kafka.serializer.avro.AvroReflectDatumBackedKafkaEncoder' 
to required type 'org.apache.kafka.common.serialization.Serializer'; nested exception is java.lang.IllegalStateException: 
Cannot convert value of type [org.springframework.integration.kafka.serializer.avro.AvroReflectDatumBackedKafkaEncoder] 
to required type [org.apache.kafka.common.serialization.Serializer]: no matching editors or conversion strategy found

我的bean定义是：

int-kafka:producer-context id="kafkaProducerContext" producer-properties="producerProperties">
    <int-kafka:producer-configurations>
        <int-kafka:producer-configuration broker-list="localhost:9092"
                key-class-type="java.lang.String"
                value-class-type="org.springframework.integration.samples.kafka.user.User"
                topic="test1"
                value-serializer="kafkaSpecificEncoder"
                key-serializer="kafkaReflectionEncoder"
                partitioner="customPartitioner"/>

其中kafkaSpecificEncoder的声明如下：

<bean id="kafkaSpecificEncoder" class="org.springframework.integration.kafka.serializer.avro.AvroSpecificDatumBackedKafkaEncoder">
    <constructor-arg value="org.springframework.integration.samples.kafka.user.User" />
</bean>

用户obj是从avro自动生成的。基本上我试图运行一个旧的例子，但我不明白我错在哪里

感谢您的帮助

Answer 1

您有迁移错误。

请参阅：您使用Encoder，但请将其指定为真正需要value-serializer实施的org.apache.kafka.common.serialization.Serializer。

所以，或者使用key(value)-encoder进行<int-kafka:producer-configuration>配置，或者使用EncoderAdaptingSerializer包装您的编码器。

无法转换类型的值[org.springframework.integration.kafka.serializer.avro

1 个答案: