可用:预计至少有 1 个 bean 有资格作为自动装配候选 [英] available: expected at least 1 bean which qualifies as autowire candidate
本文介绍了可用:预计至少有 1 个 bean 有资格作为自动装配候选的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想实现发送和接收 Java 序列化对象的 Kafka 生产者.我试过这个:
I want to implement Kafka producer which sends and receives Java Serialized Objects. I tried this:
制作人:
@Configuration
public class KafkaProducerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
}
发送对象:
@Autowired
private KafkaTemplate<String, SaleRequestFactory> kafkaTemplate;
private static String topic = "tp-sale";
private void perform(){
Transaction transaction = new Transaction();
transaction.setStatus(PaymentTransactionStatus.IN_PROGRESS.getText());
Transaction insertedTransaction = transactionService.save(transaction);
SaleRequestFactory obj = new SaleRequestFactory();
obj.setId(100);
ListenableFuture<SendResult<String, SaleRequestFactory>> send = kafkaTemplate.send(topic, obj);
}
消费者:
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
private String groupId = "test";
@Bean
public ConsumerFactory<String, String> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String>
kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
//接收对象
private static String topic = "tp-sale";
@KafkaListener(topics = "tp-sale")
public SaleResponseFactory transactionElavonAuthorizeProcess(@Payload SaleRequestFactory tf, @Headers MessageHeaders headers) throws Exception {
System.out.println(tf.getId());
SaleResponseFactory resObj = new SaleResponseFactory();
resObj.setUnique_id("123123");
return resObj;
}
当我部署 Producer 时，我在部署过程中遇到错误:
When I deploy the Producer I get error during deployment:
由于 org.springframework.beans.factory.NoSuchBeanDefinitionException 异常，应用程序无法启动:没有类型为 'org.springframework.kafka.core.KafkaTemplate<java.lang.String, org.engine 的合格 bean.插件.transactions.factory.SaleRequestFactory>'可用:预计至少有 1 个 bean 有资格作为自动装配候选.依赖注解:{@org.springframework.beans.fac tory.annotation.Autowired(required=true)}
你知道我该如何解决这个问题吗?
Do you know how I can fix this issue?
我设法实现了这些改进:
I managed to implement these improvements:
制作人:
@Configuration
public class KafkaProducerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, SaleRequestFactory> saleRequestFactoryProducerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, SaleRequestFactorySerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate() {
return new KafkaTemplate<>(saleRequestFactoryProducerFactory());
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
}
发送对象:
@Autowired
private KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate;
private static String topic = "tp-sale";
private void perform(){
SaleRequestFactory obj = new SaleRequestFactory();
obj.setId(100);
ListenableFuture<SendResult<String, SaleRequestFactory>> send = saleRequestFactoryKafkaTemplate.send(topic, obj);
}
消费者:
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
private String groupId = "test";
@Bean
public ConsumerFactory<String, SaleResponseFactory> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, SaleResponseFactoryDeserializer.class);
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
//接收对象
@KafkaListener(topics = "tp-sale")
public SaleResponseFactory transactionElavonAuthorizeProcess(@Payload SaleRequestFactory tf, @Headers MessageHeaders headers) throws Exception {
System.out.println(tf.getId());
SaleResponseFactory resObj = new SaleResponseFactory();
resObj.setUnique_id("123123");
return resObj;
}
自定义对象
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleRequestFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private int id;
}
public class SaleRequestFactorySerializer implements Serializable, Serializer<SaleRequestFactory> {
@Override
public byte[] serialize(String topic, SaleRequestFactory data) {
// convert data to byte[]
ByteArrayOutputStream out = new ByteArrayOutputStream();
try
{
ObjectOutputStream outputStream = new ObjectOutputStream(out);
outputStream.writeObject(data);
out.close();
}
catch (IOException e)
{
e.printStackTrace();
}
return out.toByteArray();
}
}
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleResponseFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private String unique_id;
}
public class SaleResponseFactoryDeserializer implements Serializable, Deserializer<SaleResponseFactory> {
@Override
public SaleResponseFactory deserialize(String topic, byte[] data) {
// convert data to SaleResponseFactory
SaleResponseFactory saleResponseFactory = null;
try
{
ByteArrayInputStream bis = new ByteArrayInputStream(data);
ObjectInputStream in = new ObjectInputStream(bis);
saleResponseFactory = (SaleResponseFactory) in.readObject();
in.close();
}
catch (IOException | ClassNotFoundException e)
{
e.printStackTrace();
}
return saleResponseFactory;
}
}
当我发送一些消息时出现错误:
When I send some message I get error:
13:03:53.675 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] DEBUG RecordMessagingMessageListenerAdapter[debug:296] - Listener method returned result [org.factory.SaleResponseFactory@69c400ab] - generating response message for it
13:03:53.675 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] DEBUG RecordMessagingMessageListenerAdapter[debug:296] - No replyTopic to handle the reply: org.factory.SaleResponseFactory@69c400ab
你知道我该如何解决这个问题吗?
Do you know how I can solve this issue?
推荐答案
回答更新部分 - 我认为调试消息具有误导性，因为您没有选择将结果转发到另一个主题.更多详情这里.一切似乎都按预期工作.我认为需要有一种方法来跳过整个转发，包括当侦听器返回类型不是 Message 或 @SendTo 使用转发所需的注释时的日志记录.我删除了一个 comment 让 spring kafka committer 看看他的想法.
Answering the update part - I believe the debug messages are misleading as you are not opting in to forward results to another topic. More details here. Everything appears to be working as expected. I think there needs to be a way to skip the entire forwarding including logging when the listener return type is not Message or @SendTo annotation is used which is required for forwarding. I've dropped a comment for spring kafka committer to see what he thinks.
这篇关于可用:预计至少有 1 个 bean 有资格作为自动装配候选的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
