no provider available for the service错误解决方案

在分布式项目中Dubbo发布服务报No provider available for the service错误。错误信息如下：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dubboServiceTest': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Failed to check the status of the service com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest. No provider available for the service com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest from the url zookeeper://22.189.25.95:2181/com.alibaba.dubbo.registry.RegistryService?application=access-provider-ccms-test&dubbo=2.8.4&interface=com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest&methods=getResponseData&pid=8184&side=consumer&timestamp=1523930029357 to the consumer 22.189.25.95 use dubbo version 2.8.4

[2018-04-17 10:57:23.488] [thread-main] [INFO] --  [DUBBO] Notify urls for subscribe url consumer://22.189.25.95/com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest?application=access-provider-ccms-test&category=providers,configurators,routers&check=false&dubbo=2.8.4&interface=com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest&methods=getResponseData&pid=11908&side=consumer&timestamp=1523933842862, urls: [empty://22.189.25.95/com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest?application=access-provider-ccms-test&category=providers&check=false&dubbo=2.8.4&interface=com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest&methods=getResponseData&pid=11908&side=consumer&timestamp=1523933842862, empty://22.189.25.95/com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest?application=access-provider-ccms-test&category=configurators&check=false&dubbo=2.8.4&interface=com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest&methods=getResponseData&pid=11908&side=consumer&timestamp=1523933842862, empty://22.189.25.95/com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest?application=access-provider-ccms-test&category=routers&check=false&dubbo=2.8.4&interface=com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest&methods=getResponseData&pid=11908&side=consumer&timestamp=1523933842862], dubbo version: 2.8.4, current host: 22.189.25.95com.alibaba.dubbo.rpc.RpcException: Forbid consumer 22.189.25.95 access service com.bocsoft.ccms.demo.dubbo.service.IDubboServiceTest from registry 22.189.25.95:2181 use dubbo version 2.8.4, Please check registry access list (whitelist/blacklist).

解决方案

Dubbo默认（缺省）会在启动时检查依赖的服务是否可用，不可用时会抛出异常，阻止Spring初始化完成，以便上线时，能及早发现问题，默认check=true。

如果你的Spring容器是懒加载的，或者通过API编程延迟引用服务，请关闭check，否则服务临时不可用时，会抛出异常，拿到null引用，如果check=false，总是会返回引用，当服务恢复时，能自动连上。

可以通过check=”false”关闭检查，比如，测试时，有些服务不关心，或者出现了循环依赖，必须有一方先启动。

• 关闭某个服务的启动时检查：(没有提供者时报错)

<dubbo:reference interface="com.taotao.ItemService" check="false" />

• 关闭所有服务的启动时检查：(没有提供者时报错) 写在定义服务消费者一方

<dubbo:consumer check="false" />

• 关闭注册中心启动时检查：(注册订阅失败时报错)

<dubbo:registry check="false" />

附

• Zookeeper 下载地址: 点我下载

• Dubbo-admin 下载地址: 点我下载

• Dubbo-monitor 下载地址: 点我下载