我正在开发一个微服务，该服务需要在Spring Boot和Kafka的事务处理下利用同步调用。为此，我将ReplyKafkaTemplate与KafkaTransactionManager一起使用。但是ReplyKafkaTemplate显然不适用于事务！ Kafka消息需要进行事务处理，因此在发生故障时不会丢失。但是，当我添加KafkaTransactionManager设置时，会引发异常。
要求：
Spring Boot：2.3.1
卡夫卡：2.5.0
Spring Kafka：2.5.2
方案1： 添加bean KafkaTransactionManager时，在应用程序启动期间引发错误：创建在类路径资源中定义的名称为'kafkaTransactionManager'的bean时出错。
配置： application.yml
kafka:
bootstrap-servers: localhost:9092
topic:
request-topic: request-topic
request-reply-topic: request-reply-topic
consumer-group: request-reply-group
producer:
transactionIdPrefix: "kafka-tx-"
KafkaSettings.java
@Configuration
public class KafkaSettings {
@Autowired
private KafkaProperties kafkaProperties;
@Value("${kafka.topic.request-reply-topic}")
private String requestReplyTopic;
@Value("${kafka.topic.consumer-group}")
private String consumerGroup;
@Bean
public KafkaTransactionManager kafkaTransactionManager() {
KafkaTransactionManager ktm = new KafkaTransactionManager<>(producerFactory());
ktm.setTransactionSynchronization(AbstractPlatformTransactionManager.SYNCHRONIZATION_ON_ACTUAL_TRANSACTION);
return ktm;
}
@Bean
public Map<String, Object> producerConfigs() {
Map<String, Object> props = new HashMap<>(kafkaProperties.buildProducerProperties());
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
return props;
}
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>(kafkaProperties.buildProducerProperties());
props.put(ConsumerConfig.GROUP_ID_CONFIG, "coffeeshop-consumer-group-id");
return props;
}
@Bean
public ProducerFactory<String, Object> producerFactory() {
DefaultKafkaProducerFactory<String, Object> pf = new DefaultKafkaProducerFactory<>(producerConfigs());
return pf;
}
@Bean
public ConsumerFactory<String, Object> consumerFactory() {
final JsonDeserializer<Object> jsonDeserializer = new JsonDeserializer<>();
jsonDeserializer.addTrustedPackages("*");
return new DefaultKafkaConsumerFactory<>(consumerConfigs(), new StringDeserializer(), jsonDeserializer);
}
@Bean
public KafkaTemplate<?, ?> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
@Bean
public ReplyingKafkaTemplate<?, ?, ?> replyingKafkaTemplate(ProducerFactory<String, Object> pf, KafkaMessageListenerContainer<String, Object> container){
return new ReplyingKafkaTemplate(pf, container);
}
@Bean
public KafkaMessageListenerContainer<String, Object> replyContainer(ConsumerFactory<String, Object> cf) {
ContainerProperties containerProperties = new ContainerProperties(requestReplyTopic);
return new KafkaMessageListenerContainer<>(cf, containerProperties);
}
@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, Object>> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
factory.setReplyTemplate(kafkaTemplate());
return factory;
}
}
CoffeeController.java
@RequestMapping
@RestController
public class CoffeeController {
@Autowired(required = true)
private ReplyingKafkaTemplate<String, Coffee, Coffee> replyingKafkaTemplate;
@Value("${kafka.topic.request-topic}")
String requestTopic;
@Value("${kafka.topic.request-reply-topic}")
String requestReplyTopic;
private RequestReplyFuture<String, Coffee, Coffee> requestReplyFuture;
@ResponseBody
@PostMapping(value=“/coffee/create",produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
public Coffee create (@RequestBody Coffee coffee) throws ExecutionException, InterruptedException {
ProducerRecord<String, Coffee> record = new ProducerRecord<String, Coffee>(requestTopic, coffee);
record.headers().add(new RecordHeader(KafkaHeaders.REPLY_TOPIC, requestReplyTopic.getBytes()));
requestReplyFuture = replyingKafkaTemplate.sendAndReceive(record);
ConsumerRecord<String, Coffee> consumerRecord = requestReplyFuture.get();
return consumerRecord.value();
}
}
CreateCoffee.java
@Component
public class CreateCoffee {
@KafkaListener(topics = "${kafka.topic.request-topic}")
@SendTo
public Coffee listen(Coffee coffee) {
coffee.setId(UUID.randomUUID());
return coffee;
}
}
Coffee.java
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Coffee {
@JsonProperty("id")
private UUID id;
@JsonProperty("price")
private BigDecimal price;
@JsonProperty("varietal")
private String varietal;
@JsonProperty("quantity")
private Integer quantity;
@JsonProperty("amount")
private BigDecimal amount;
public UUID getId() {
return id;
}
public void setId(UUID id) {
this.id = id;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public String getVarietal() {
return varietal;
}
public void setVarietal(String varietal) {
this.varietal = varietal;
}
public Integer getQuantity() {
return quantity;
}
public void setQuantity(Integer quantity) {
this.quantity = quantity;
}
public BigDecimal getAmount() {
return price.multiply(BigDecimal.valueOf(quantity));
}
}
例外：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kafkaTransactionManager' defined in class path resource [coffeeshop/kafka/KafkaSettings.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.kafka.transaction.KafkaTransactionManager]: Factory method 'kafkaTransactionManager' threw exception; nested exception is java.lang.IllegalArgumentException: The 'ProducerFactory' must support transactions
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:893) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at coffeeshop.CoffeeShopApplication.main(CoffeeShopApplication.java:9) ~[classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.kafka.transaction.KafkaTransactionManager]: Factory method 'kafkaTransactionManager' threw exception; nested exception is java.lang.IllegalArgumentException: The 'ProducerFactory' must support transactions
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
... 20 common frames omitted
Caused by: java.lang.IllegalArgumentException: The 'ProducerFactory' must support transactions
at org.springframework.util.Assert.isTrue(Assert.java:118) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.kafka.transaction.KafkaTransactionManager.<init>(KafkaTransactionManager.java:88) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at coffeeshop.kafka.KafkaSettings.kafkaTransactionManager(KafkaSettings.java:49) ~[classes/:na]
at coffeeshop.kafka.KafkaSettings$$EnhancerBySpringCGLIB$$aa27e75a.CGLIB$kafkaTransactionManager$2(<generated>) ~[classes/:na]
at coffeeshop.kafka.KafkaSettings$$EnhancerBySpringCGLIB$$aa27e75a$$FastClassBySpringCGLIB$$498ae027.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at coffeeshop.kafka.KafkaSettings$$EnhancerBySpringCGLIB$$aa27e75a.kafkaTransactionManager(<generated>) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
... 21 common frames omitted
方案2： 通过调用 transactionCapable（）并添加 setTransactionIdPrefix（“ coffee-prefix”）来手动配置ProducerFactory，将引发以下错误：
没有交易在进行中；可能的解决方案：在template.executeInTransaction（）
范围内运行模板操作@Bean
public ProducerFactory<String, Object> producerFactory() {
DefaultKafkaProducerFactory<String, Object> pf = new DefaultKafkaProducerFactory<>(producerConfigs());
pf.transactionCapable();
pf.setTransactionIdPrefix("coffee-prefix");
return pf;
}
java.lang.IllegalStateException: No transaction is in process; possible solutions: run the template operation within the scope of a template.executeInTransaction() operation, start a transaction with @Transactional before invoking the template method, run in a transaction started by a listener container when consuming a record
at org.springframework.util.Assert.state(Assert.java:73) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.getTheProducer(KafkaTemplate.java:636) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.doSend(KafkaTemplate.java:548) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.send(KafkaTemplate.java:385) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.requestreply.ReplyingKafkaTemplate.sendAndReceive(ReplyingKafkaTemplate.java:323) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.requestreply.ReplyingKafkaTemplate.sendAndReceive(ReplyingKafkaTemplate.java:302) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at coffeeshop.web.controllers.CoffeeController.create(CoffeeController.java:39) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.36.jar:9.0.36]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
预期结果：
请求
curl -X POST http://localhost:8080/coffee/create -d '{"varietal": "Yellow Bourbon","quantity": 3, "price": 30.00}' -H "Content-Type: application/json" | python -m json.tool
响应：
{
"id": "26eca82d-8bd0-4fd4-a743-5de52f9b6d4f",
"price": 30.0,
"varietal": "Yellow Bourbon",
"quantity": 3,
"amount": 90.0
}
答案 0 :(得分：0)
在第一种情况下，您需要一个spring前缀：
spring:
kafka:
bootstrap-servers: localhost:9092
topic:
request-topic: request-topic
request-reply-topic: request-reply-topic
consumer-group: request-reply-group
producer:
transactionIdPrefix: "kafka-tx-"
在任何一种情况下，您都需要向@Transactional方法中添加create，以便事务管理器开始事务。
或者，您可以使用
@ResponseBody
@PostMapping(value=“/coffee/create",produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
public Coffee create (@RequestBody Coffee coffee) throws ExecutionException, InterruptedException {
ProducerRecord<String, Coffee> record = new ProducerRecord<String, Coffee>(requestTopic, coffee);
record.headers().add(new RecordHeader(KafkaHeaders.REPLY_TOPIC, requestReplyTopic.getBytes()));
return replyingKafkaTemplate.executeInTransaction(template -> {
requestReplyFuture = replyingKafkaTemplate.sendAndReceive(record);
ConsumerRecord<String, Coffee> consumerRecord = requestReplyFuture.get();
return consumerRecord.value();
});
}
错误似乎很明显：
java.lang.IllegalStateException：没有事务在进行中；可能的解决方案：在template.executeInTransaction（）操作范围内运行模板操作，在调用模板方法之前使用@Transactional启动事务，在使用记录时在由侦听器容器启动的事务中运行
顺便说一句；最好将来使用get(timeout, TimeUnit...)，以避免由于某种原因而没有返回答复时无限期挂起。
编辑
但是，这对于使用isolation.level=read_committed的使用者永远不会起作用，因为该使用者在提交请求之前不会看到该请求，而在收到答复之前我们不会提交该请求，这将永远不会发生，所以我们会超时并中止交易。
sendAndReceive()不能在交易中使用。
唯一的解决方案是发送并添加您自己的侦听器以获取答复（并将其与请求关联）。