io.openmessaging parent 2.0.2-pubsub 4.0.0 jar openmessaging-api-samples 2.0.2-pubsub openmessaging-api-samples ${project.version} junit junit 4.11 test ${project.groupId} openmessaging-api 2.0.2-pubsub org.slf4j slf4j-api 1.7.5