1.背景

在MAC系统中使用dubbo的multicast模式，启动报错：

Exception in thread "main" java.lang.IllegalStateException: Can't assign requested addressat com.alibaba.dubbo.registry.multicast.MulticastRegistry.<init>(MulticastRegistry.java:116)at com.alibaba.dubbo.registry.multicast.MulticastRegistryFactory.createRegistry(MulticastRegistryFactory.java:30)at com.alibaba.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:95)at com.alibaba.dubbo.registry.RegistryFactory$Adaptive.getRegistry(RegistryFactory$Adaptive.java)at com.alibaba.dubbo.registry.integration.RegistryProtocol.getRegistry(RegistryProtocol.java:215)at com.alibaba.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:126)at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:91)at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:66)at com.alibaba.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java)at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:505)at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:357)at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:316)at com.alibaba.dubbo.config.ServiceConfig.export(ServiceConfig.java:215)at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:121)at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:50)at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)at com.biutefu.vertxdubbo.demo.provider.Provider.main(Provider.java:12)
Caused by: java.net.SocketException: Can't assign requested addressat java.net.PlainDatagramSocketImpl.join(Native Method)at java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:178)at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)at com.alibaba.dubbo.registry.multicast.MulticastRegistry.<init>(MulticastRegistry.java:90)... 24 more

造成这种原因的主要是系统中开启了IPV6协议，java网络编程经常会获取到IPv6的地址。解决方法：
添加vm参数

 -Djava.net.preferIPv4Stack=true

如图

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Dubbo ：广播模式下Can't assign requested address问题

1.背景

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