为什么brave.Tracer 不能在@Configuration 类中自动装配？

Question

我正在将 spring-boot 升级到 2.6.2 和 spring-cloud 到 2021.0.0，升级后，brave.Tracer 无法在 @Configuration 类中自动装配。

Tracer 自动装配为 @Bean 组件的参数。

我已经尝试过question 中的解决方案，但不起作用。

这是@Configuration 类：

@Configuration
@ConditionalOnWebApplication
@AutoConfigureAfter(CommonsAutoConfig.class)
@EnableConfigurationProperties({CorsConfig.class, TracingConfiguration.class})
public class WebCommonsAutoConfig
{
    ......
    @Bean(name = "httpRestRequestResponseLogger")
    @RefreshScope
    public FilterRegistrationBean httpRestRequestResponseLogger(
            RequestResponseLogger requestResponseLogger, 
            HeaderAccessor headerAccessor,
            Tracer tracer, 
            HeaderExtractor<HttpServletRequestLoggingWrapper> httpHeaderExtractor)
    {
        final HttpLogFilter httpLogFilter=  new HttpLogFilter(requestResponseLogger, 
                   headerAccessor, tracer, httpHeaderExtractor);
        final FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(httpLogFilter);
        registrationBean.setDispatcherTypes(ASYNC, ERROR, FORWARD, INCLUDE, REQUEST);
        registrationBean.setOrder(HttpLogFilter.ORDER);
        return registrationBean;
    }
    ....
}

带有以下错误日志：

...
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'scopedTarget.httpRestRequestResponseLogger' defined in class 
path resource [com/vzt/WebCommonsAutoConfig.class]: Unsatisfied dependency expressed 
through method 'httpRestRequestResponseLogger' parameter 2; 
...
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No 
qualifying bean of type 'brave.Tracer' available: expected at least 1 bean which 
qualifies as autowire candidate. Dependency annotations: {}
 

那么我应该怎么做才能在这个@Configuration 类中自动装配brave.Tracer？

Answer 1

您很可能需要添加@AutoConfigureAfter(BraveAutoConfiguration.class)。我知道 spring cloud sleuth 在类路径上？