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# Bug
If import opentracing-spring-cloud-jdbc-starter dependency, and configure `driver-class-name: io.opentracing.contrib.jdbc.TracingDriver` at the same time, then duplicated span will be generated…
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刚开始学习dubbo，有些不太明白。请问怎么配置dubbo.configcenter，才能看到元数据呢？
我在[这里](https://github.com/apache/incubator-dubbo-admin/wiki/Dubbo-Admin%E9%85%8D%E7%BD%AE%E8%AF%B4%E6%98%8E)看到说明
`dubbo.configcenter
推荐使用，配置中心…
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I just stated learning dubbo.my version and config:
dubbo-spring-boot-starter: 2.7.5.
provider service:
 values (?, ?, ? ,date_add(n…
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在提供的示例中的samples中的dubbo-registry-nacos-samples例子，启动provider出错。例子中的provider是使用application.properties作为配置文件的，使用application.properties能正常启动并注册provider。但是，我根据application.properties修改为application.yml，启动…
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Caused by: java.lang.NoClassDefFoundError: com/alibaba/csp/sentinel/datasource/nacos/NacosDataSource
at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_201]
at java.lan…
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yaml格式：
current:
env:qa
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**apollo配置：**
```
apollo.bootstrap.enabled=true
apollo.bootstrap.namespaces=application,config-gateway-route,RD.config-jasypt,RD.config-eureka-client,RD.config-redis,RD.config-monitor
apollo.boots…