我将这个kafka配置与弹簧云和弹簧引导2.6.6:一起使用
@Configuration
@RefreshScope
public class KafkaProducerConfig {
@Bean(name = "nativeProducerFactory")
@Primary
@RefreshScope
public ProducerFactory<String, String> nativeProducerFactory() {
final Map<String, Object> properties = new HashMap<>();
properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
return new DefaultKafkaProducerFactory<>(properties);
}
@Bean(name = "nativeKafkaTemplate")
public KafkaTemplate<String, String> nativeKafkaTemplate(
@Autowired final ProducerFactory<String, String> factory) {
return new KafkaTemplate<>(factory);
}
但当我开始这个项目时，我得到了这个错误：
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.kafka.core.ProducerFactory<java.lang.Object, java.lang.Object>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1799)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1355)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389)
at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.getIfUnique(DefaultListableBeanFactory.java:2072)
at org.springframework.boot.autoconfigure.kafka.KafkaAnnotationDrivenConfiguration.<init>(KafkaAnnotationDrivenConfiguration.java:93)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:311)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:296)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301)
at com.atlas.psp.AtlasRouterApplication.main(AtlasRouterApplication.java:48)
21:45:59.271 [main] ERROR LoggingFailureAnalysisReporter[report:40] -
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of method kafkaTemplate in org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration required a bean of type 'org.springframework.kafka.core.ProducerFactory' that could not be found.
The following candidates were found but could not be injected:
- User-defined bean method 'nativeProducerFactory' in 'KafkaProducerConfig'
Action:
Consider revisiting the entries above or defining a bean of type 'org.springframework.kafka.core.ProducerFactory' in your configuration.
你知道我该怎么解决这个问题吗？
当我从bean中删除@RefreshScope时，它工作得很好。你知道我该怎么解决这个问题吗？
第页。S看起来添加@RefreshScope也像这样解决了错误：
@Bean(name = "nativeKafkaTemplate")
@RefreshScope
public KafkaTemplate<String, String> nativeKafkaTemplate(
@Autowired final ProducerFactory<String, String> factory) {
return new KafkaTemplate<>(factory);
}
但我认为这是不正确的。你知道解决这个问题的正确方法是什么吗？
该问题与@Configuration类上的@RefreshScope有关。为特定的@Bean更好地定义@RefreshScope。
根据Spring Cloud上下文-刷新范围
@RefreshScope(技术上)在@Configuration类上工作，但它可能会导致令人惊讶的行为。例如，这并不意味着在该类中定义的所有CCD_ 9本身都在CCD_。具体来说，任何依赖这些豆子的东西都不能依赖它们启动刷新时更新，除非它本身在CCD_ 11。在这种情况下，它是在刷新时重建的依赖关系被重新注入。此时，它们将被重新初始化来自刷新的@Configuration)
这就是当您将其移动到@Bean时它工作的原因。