我知道这个问题非常普遍,但是在尝试不同的解决方案后,我没有找到任何一个有效的解决方法。 我想在收到 Kafka 消息时反序列化字符串以及我的自定义类对象。 与字符串一起使用很好,但是与我的类不行。 我已在消费者配置中添加了可信包(其中com.springmiddleware.entities
是我的类所在的包):
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "foo");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put(JsonDeserializer.TRUSTED_PACKAGES, "com.springmiddleware.entities");
return props;
}
我在我的application.yml
文件中有这个内容:
spring:
kafka:
bootstrap-servers: localhost:9092
consumer:
group-id: foo
auto-offset-reset: earliest
value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
properties:
spring:
json:
trusted:
packages: 'com.springmiddleware.entities'
并将这些行添加到application.properties
中
spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.properties.spring.json.trusted.packages=com.springmiddleware.entities
spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
spring.kafka.producer.properties.spring.json.add.type.headers=false
但是一直显示以下错误:
org.apache.kafka.common.errors.SerializationException:在偏移1的topic2-0分区上反序列化键/值时出错。如果需要,请寻找过去的记录以继续消耗。原因是:java.lang.IllegalArgumentException:类'com.springmiddleware.entities.Crime'不在可信包中:[java.util,java.lang]。如果您认为此类是安全的进行反序列化,请提供其名称。如果仅由受信任的源进行序列化,则还可以启用全部信任(*)。
更新
ReceiverConfig:
@EnableKafka
@Configuration
public class ReceiverConfig {
@Value("${spring.kafka.bootstrap-servers}")
private String bootstrapServers;
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "foo");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put(JsonDeserializer.TRUSTED_PACKAGES, "com.springmiddleware.entities");
props.put(JsonDeserializer.USE_TYPE_INFO_HEADERS, "false");
return props;
}
@Bean
public ConsumerFactory<String, Object> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs(), new StringDeserializer(),
new JsonDeserializer<>());
}
@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, Object>> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
更新2
Listener Class (Receiver):
@KafkaListener(topics = "${app.topic.foo}")
@Service
public class Receiver {
private CountDownLatch latch = new CountDownLatch(1);
public CountDownLatch getLatch() {
return latch;
}
@KafkaHandler
public void listen(@Payload Crime message) {
System.out.println("Received " + message);
}
@KafkaHandler
public void listen(@Payload String message) {
System.out.println("Received " + message);
}
Consumerconfig
文件吗,@TodorokiM。 - Ryuzaki L