@@ ConditionalOnBean即使已创建也未检测到bean

Question

我有一个用@Configuration和bean注释的类

  @Configuration
  public class ExampleServiceConfig {

  @Bean
  @ConditionalOnProperty(value = servicefeature1.enable", havingValue = "true")
  public ExampleServices exampleServices() {
    return new ExampleServices();

  }

然后，我有另一个服务类，它依赖于上面的bean：

@ConditionalOnBean(ExampleServices.class)
public class AnotherService{

   @Autowired
   public AnotherService(ExampleServices exampleServices){
      this.exampleServices = exampleServices
   }
}

在春季调试日志中，我看到第一个bean正在创建：

2020-02-28 14:08:51.841 DEBUG 18158 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'exampleServices'

但是没有创建AnotherService（）：

AnotherService:
      Did not match:
         - @ConditionalOnBean (types: x.x.x.ReplicationExceptionRepositories; SearchStrategy: all) did not find any beans of type x.x.x.ReplicationExceptionRepositories (OnBeanCondition)

即使成功创建了ExampleService bean，为什么仍未创建AnotherService（）？

此外，在创建ExampleService bean之后，我还会看到“不匹配”日志。

Answer 1

我认为添加@DependsOn可以解决您的问题。这是另一个答案，与您的问题有些相似：https://stackoverflow.com/a/50518946/6908551

@Component
@ConditionalOnBean(ExampleServices.class)
@DependsOn("exampleServices")
public class AnotherService {

   @Autowired
   public AnotherService(ExampleServices exampleServices) {
      this.exampleServices = exampleServices
   }
}