4.0.0 skywalking-collector-cluster skywalking-collector-worker skywalking-collector-commons skywalking com.a.eye 3.0.1-2017 skywalking-collector pom 2.4.17 2.8.1 com.typesafe.akka akka-cluster_2.11 ${akka.version} org.apache.logging.log4j log4j-core ${log4j.version} org.apache.logging.log4j log4j-api ${log4j.version} com.typesafe.akka akka-testkit_2.11 ${akka.version} test