@conditionalonbean不能与micrometer MeterRegistry一起正常工作

Question

我正在尝试使用Micrometer从我的spring boot应用程序中公开度量。

以下配置由于某种原因不起作用：

@Configuration(proxyBeanMethods = false)
@AutoConfigureAfter({ MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class })
@ConditionalOnClass(MeterRegistry.class)
@ConditionalOnBean(MeterRegistry.class)
public class SuperTestAutoConfig {
    @Bean
    public Object testBean() {
        return new Object();
    }
}

spring说：

SuperTestAutoConfig:
      Did not match:
         - @ConditionalOnBean (types: io.micrometer.core.instrument.MeterRegistry; SearchStrategy: all) did not find any beans of type io.micrometer.core.instrument.MeterRegistry (OnBeanCondition)
      Matched:
         - @ConditionalOnClass found required class 'io.micrometer.core.instrument.MeterRegistry' (OnClassCondition)

但是对于完全相同的注释配置JVMMetricSautoConfiguration，它可以很好地工作：

@Configuration(proxyBeanMethods = false)
@AutoConfigureAfter({ MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class })
@ConditionalOnClass(MeterRegistry.class)
@ConditionalOnBean(MeterRegistry.class)
public class JvmMetricsAutoConfiguration {}

日志说：

   JvmMetricsAutoConfiguration matched:
      - @ConditionalOnClass found required class 'io.micrometer.core.instrument.MeterRegistry' (OnClassCondition)
      - @ConditionalOnBean (types: io.micrometer.core.instrument.MeterRegistry; SearchStrategy: all) found bean 'prometheusMeterRegistry' (OnBeanCondition)

完整的示例如下:https://filebin.net/gjxnwwksaqs1x8zg

Answer 1

原因是缺少此自动配置的spring.factors定义。在spring.factors中列出了这个类之后，它完全按照预期工作。