@ConditionalOnProperty配置无法按预期工作

Question

对于一个简单的spring引导应用程序，当时，我将面临一个意外的行为。

我在application.yml中定义了条件标志: service.enable=true

然后我创建了ServiceMesh.java接口，它应该由serviceA和serviceB实现，如下所示：

public interface ServiceMesh {
}

public class ServiceA implements ServiceMesh{
// ... code
}

public class ServiceB implements ServiceMesh{
// ... code
}

我还定义了一个配置类：

@Configuration
public class ConditionOnPropertyConfiguration {

@Bean
@ConditionalOnProperty(prefix = "service", name = "enabled", havingValue = "true")
public ServiceMesh from(){
    return new ServiceA();
  }

@Bean
@ConditionalOnProperty(prefix = "service", name = "enabled", havingValue = "false")
public ServiceMesh from(Environment env){
    return new ServiceB();
  }
}

在运行我的主课时：

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

我得到了这个错误:没有“com.example.demo.service.ServiceMesh”类型的合格bean可用:预期至少有一个bean可以作为自动测试候选。依赖性注释：{}

预期行为是启动应用程序。

Answer 1

将方法名称from更改为serviceA和serviceB。我已经将属性定义从service.enable=true更改为service.enabled=true。

    @Bean
    @ConditionalOnProperty(prefix = "service", name = "enabled", havingValue = "true")
    public ServiceMesh serviceA() {
        return new ServiceA();
    }

    @Bean
    @ConditionalOnProperty(prefix = "service", name = "enabled", havingValue = "false")
    public ServiceMesh serviceB() {
        return new ServiceB();
    }