Brixton.M4 + zuul：预期单个匹配 bean，但找到 2：dropwizardMetricServices，servoMetricServices答案

【问题标题】：Brixton.M4 + zuul: Expected single matching bean but found 2: dropwizardMetricServices,servoMetricServicesBrixton.M4 + zuul：预期单个匹配 bean，但找到 2：dropwizardMetricServices，servoMetricServices
【发布时间】：2016-02-05 14:15:39
【问题描述】：

我正在尝试将基于 Spring Boot + Spring Cloud 的项目升级到 Brixton.M4，因为 zuul 在与 SC 的 Brixton.M3 打包的版本中缺乏对 PATCH (https://github.com/spring-cloud/spring-cloud-netflix/issues/412) 的支持。我启用了 spring-boot-starter-actuator 和 spring-cloud-starter-zuul 等，但现在容器无法启动并出现以下错误：

No qualifying bean of type [org.springframework.boot.actuate.metrics.CounterService] is defined:
expected single matching bean but found 2: dropwizardMetricServices,servoMetricServices

更多堆栈跟踪：

 Could not autowire field: private org.springframework.boot.actuate.metrics.CounterService org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration.counterService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: 
No qualifying bean of type [org.springframework.boot.actuate.metrics.CounterService] is defined: expected single matching bean but found 2: dropwizardMetricServices,servoMetricServices
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 34 more 
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.boot.actuate.metrics.CounterService] is defined: expected single matching bean but found 2: dropwizardMetricServices,servoMetricServices
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1126)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
... 36 more

类路径中确实有两个 CounterService 类型的 bean：Spring-boot-actuator-1.3.1.RELEASE.jar 中的 DropwizardMetricServices 和 spring-cloud-netflix-core-1.1.0.M4.jar 中的 ServoMetricServices

有没有办法禁用其中之一？我检查了文档，但找不到任何明显的方法。

谢谢！

【问题讨论】：

标签： spring-cloud netflix netflix-zuul

【解决方案1】：

对上述答案的小修复

@Bean
@Primary
public DropwizardMetricServices dropwizardMetricServices(MetricRegistry metricRegistry){
    return new DropwizardMetricServices(metricRegistry);
}

【讨论】：

【解决方案2】：

您可以在您的 java 配置文件中使用 @Primary，如下所示：

@Bean
@Primary
public DropwizardMetricServices dropwizardMetricServices(){
    return new DropwizardMetricServices();
}

【讨论】：