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dubbo简单示例启动报错

dubbo简单示例启动报错

配置文件

<dubbo:application name="demo-provider"/>
<dubbo:registry address="multicast://224.5.6.7:1234"/>
<dubbo:protocol name="dubbo" port="20880"/>
<dubbo:service interface="com.justz.dubbo.api.demo.DemoProvider" ref="demoProvider"/>
<bean id="demoProvider" class="com.justz.dubbo.api.demo.DemoProviderImpl"/>

日志

Exception in thread "main" java.lang.IllegalStateException: Can't assign requested address
	at 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:94)
        ...
Caused by: java.net.SocketException: Can't assign requested address
	at java.net.PlainDatagramSocketImpl.join(Native Method)
	at java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:179)
	at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)
	at com.alibaba.dubbo.registry.multicast.MulticastRegistry.<init>(MulticastRegistry.java:90)

原因

java.net.NetworkInterface.getDefault()返回了IPv6地址

解决方案

启动时添加vm参数：
-Djava.net.preferIPv4Stack=true

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