4.0.0 apm-collector-cluster apm-collector-worker apm-collector-commons apm org.skywalking 3.1-2017 apm-collector pom 2.4.17 2.8.1 com.typesafe.akka akka-cluster_2.11 ${akka.version} com.typesafe.akka akka-slf4j_2.11 ${akka.version} org.slf4j slf4j-api org.apache.logging.log4j log4j-core ${log4j.version} org.apache.logging.log4j log4j-api ${log4j.version} org.apache.logging.log4j log4j-slf4j-impl ${log4j.version} runtime org.apache.logging.log4j log4j-jcl ${log4j.version} com.typesafe.akka akka-testkit_2.11 ${akka.version} test