在我添加spring-data-start-jpa和h2-database依賴之前，它拋出了這些錯誤。我允許 Axon 的自動配置完成它的作業。
這是我得到的堆疊跟蹤：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'postProductsController': Unsatisfied dependency expressed through method 'setCommandGateway' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'commandGateway' defined in class path resource [org/axonframework/springboot/autoconfig/AxonAutoConfiguration.class]: Unsatisfied dependency expressed through method 'commandGateway' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'axonServerCommandBus' defined in class path resource [org/axonframework/springboot/autoconfig/AxonServerAutoConfiguration.class]: Unsatisfied dependency expressed through method 'axonServerCommandBus' parameter 2; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'commandBus' defined in class path resource [org/axonframework/springboot/autoconfig/AxonAutoConfiguration.class]: Unsatisfied dependency expressed through method 'commandBus' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.axonframework.spring.config.AxonConfiguration': Cannot resolve reference to bean 'org.axonframework.config.Configurer' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'org.axonframework.config.Configurer': Requested bean is currently in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.resolveMethodArguments(AutowiredAnnotationBeanPostProcessor.java:767) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:719) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.13.jar:5.3.13]
at
... 77 common frames omitted
這是我創建的示例控制器：
@RestController
@RequestMapping(path = "/api/v1/products")
public class PostProductsController {
private CommandGateway commandGateway;
@Autowired
public void setCommandGateway(CommandGateway commandGateway) {
this.commandGateway = commandGateway;
}
@PostMapping
public String createProduct(@RequestBody CreateProductRestModel createProductRestModel){
CreateProductCommand createProductCommand = CreateProductCommand.builder()
.price(createProductRestModel.getPrice())
.quantity(createProductRestModel.getQuantity())
.title(createProductRestModel.getTitle())
.productId(UUID.randomUUID().toString())
.build();
String returnValue;
try{
returnValue = commandGateway.sendAndWait(createProductCommand);
} catch (Exception e){
returnValue = e.getLocalizedMessage();
}
return returnValue;
}
}
添加依賴項后，它開始拋出這些錯誤：
org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'entityManagerFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.beforeSingletonCreation(DefaultSingletonBeanRegistry.java:355) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:227) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.isSingleton(AbstractBeanFactory.java:463) ~[spring-beans-5.3.13.jar:5.3.13]
at org.axonframework.spring.config.AbstractAnnotationHandlerBeanPostProcessor.postProcessAfterInitialization(AbstractAnnotationHandlerBeanPostProcessor.java:73) ~[axon-spring-4.5.4.jar:4.5.4]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:455) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1808) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.13.jar:5.3.13]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1154) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:908) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) ~[spring-boot-2.6.0.jar:2.6.0]
at com.mrdiipo.productsservice.ProductsServiceApplication.main(ProductsServiceApplication.java:12) ~[classes/:na]
這是我的application.properties檔案：
server.port = 0
spring.application.name=products-service
eureka.client.service-url.defaultZone= http://localhost:8761/eureka
eureka.instance.instanceid=${spring.application.name}:${instanceId:${random.value}}
spring.datasource.url=jdbc:h2:file:~/products;AUTO_SERVER=true
spring.datasource.username=root
spring.datasource.password=XXXXX
spring.datasource.driver-class-name=org.h2.Driver
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=update
spring.h2.console.enabled=true
spring.datasource.generate-unique-name= false
spring.h2.console.path=/h2-console
spring.h2.console.settings.web-allow-others=true
uj5u.com熱心網友回復：
這里要知道的最重要的事情是您使用的是哪個版本的 Spring Boot，我可以從堆疊跟蹤中看到：2.6.0。
本周某個地方發布的這個版本增加了一個額外的檢查，可以解釋你所遇到的情況，可以在這里找到。
參考他們：
默認禁止回圈參考
現在默認禁止 bean 之間的回圈參考。如果您的應用程式由于 BeanCurrentlyInCreationException 而無法啟動，則強烈建議您更新配置以打破依賴回圈。如果您無法這樣做，可以通過將 spring.main.allow-circular-references 設定為 true，或使用 SpringApplication 和 SpringApplicationBuilder 上的新 setter 方法再次允許回圈參考。這將恢復 2.5 的行為并自動嘗試打破依賴回圈。
在 Axon 方面，我們已經在努力解決這個問題，您可以在此處找到解決此問題的 PR 。在合并之后，您可以期待一個帶有此修復程式的小版本，但如果需要，請隨時遵循 Spring 關于如何自己修復它的建議。
韓國，
uj5u.com熱心網友回復：
問題無法理解，請與我們分享更多代碼以獲得詳細答案。看起來你的兩個類是依賴的。正如評論中提到的 mdh，@Lazy 可以解決您的問題。
@Autowired @Lazy
private Class class;
更多資訊：https : //www.baeldung.com/circular-dependencies-in-spring
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