Dubbo Caused by: java.lang.IllegalStateException异常

关于异常

org.springframework.beans.factory.BeanInitializationException: Failed to init remote service reference at filed userService in class cn.itsource.consumer.ConsumerTest; nested exception is java.lang.IllegalStateException: Failed to check the status of the service cn.itsource.service.IUserService. No provider available for the service cn.itsource.service.IUserService from the url multicast://239.5.6.7:1234/com.alibaba.dubbo.registry.RegistryService?anyhost=true&application=dubbo-test-consumer&check=false&dubbo=2.8.4a&generic=false&interface=cn.itsource.service.IUserService&methods=get&owner=sampson&pid=17444&side=consumer×tamp=1535979210304 to the consumer 192.168.0.109 use dubbo version 2.8.4a
	at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:253)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1560)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:399)
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:119)
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:212)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:200)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:252)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:254)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:217)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.IllegalStateException: Failed to check the status of the service cn.itsource.service.IUserService. No provider available for the service cn.itsource.service.IUserService from the url multicast://239.5.6.7:1234/com.alibaba.dubbo.registry.RegistryService?anyhost=true&application=dubbo-test-consumer&check=false&dubbo=2.8.4a&generic=false&interface=cn.itsource.service.IUserService&methods=get&owner=sampson&pid=17444&side=consumer×tamp=1535979210304 to the consumer 192.168.0.109 use dubbo version 2.8.4a
	at com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:420)
	at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:300)
	at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:138)
	at com.alibaba.dubbo.config.spring.AnnotationBean.refer(AnnotationBean.java:317)
	at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:246)
	... 27 more

上面显示消费者没有在注册中心找到User服务，No provider available for the service cn.itsource.service.IUserService from the url multicast://239.5.6.7:1234/com.alibaba.dubbo.registry.RegistryService
关闭防火墙，