4.0.0 nats-samples 0.4.0 pom io.nats nats-spring-parent 0.4.0 .. 2.1.6.RELEASE 2.2.0.RELEASE 1.8 processor-sample listener-sample polling-sample source-sample queue-sample multi-connect-sample autoconfigure-sample connect-error-sample org.springframework.boot spring-boot-maven-plugin