在用Java编写了一个udp生产者和消费者的demo时，在生产者启动的时候会抛出异常

java.net.SocketException: Can't assign requested address

    at java.net.PlainDatagramSocketImpl.join(Native Method)

    at java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:178)

    at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)

    at com.yanwu.demo.java.socket.udp.Producer.<init>(Producer.java:41)

    at com.yanwu.demo.java.socket.udp.Producer.main(Producer.java:71)

解决方案：

在jvm的启动参数中添加-Djava.net.preferIPv4Stack=true.

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