4.0.0 org.apache apache 21 org.apache.dubbo dubbo-dependencies-zookeeper 2.7.1 pom org.apache.dubbo dubbo-dependencies-bom 2.7.1 pom import org.apache.curator curator-recipes org.apache.zookeeper zookeeper release org.apache.maven.plugins maven-gpg-plugin verify sign dubbo-2.7.1