This sample code demonstrates building up dubbo service provider and service consumer with the pure API approach. In this example, multicast is facilitated as the registration mechanism, therefore it is necessary to explicitly specify system property java.net.preferIPv4Stack
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mvn clean package mvn -Djava.net.preferIPv4Stack=true -Dexec.mainClass=org.apache.dubbo.samples.provider.Application exec:java
mvn -Djava.net.preferIPv4Stack=true -Dexec.mainClass=org.apache.dubbo.samples.client.Application exec:java