oap-server org.apache.skywalking 6.5.0-SNAPSHOT 4.0.0 exporter org.apache.skywalking server-core ${project.version} io.grpc grpc-testing org.xolstice.maven.plugins protobuf-maven-plugin 0.5.0 com.google.protobuf:protoc:3.3.0:exe:${os.detected.classifier} grpc-java io.grpc:protoc-gen-grpc-java:1.8.0:exe:${os.detected.classifier} compile compile-custom