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说明：
应用程序上下文中某些bean的依赖性形成一个循环：
| tracingFilter defined in class path resource [io/opentracing/contrib/spring/web/autoconfig/ServerTracingAutoConfiguration.class]
↑ ↓
| io.opentracing.contrib.spring.web.autoconfig.TracerAutoConfiguration (field private io.opentracing.Tracer io.opentracing.contrib.spring.web.autoconfig.TracerAutoConfiguration.tracer)
↑ ↓
| getTracer
└─────┘