src/main/java/org/jenkinsci/plugins/docker/swarm/BuildScheduler.java:21: error: as of release 9, '_' is a keyword, and may not be used as an identifier
src/main/java/org/jenkinsci/plugins/docker/swarm/ResetStuckBuildsInQueueActor.java:35: error: as of release 9, '_' is a keyword, and may not be used as an identifier
src/main/java/org/jenkinsci/plugins/docker/swarm/DockerSwarmAgentLauncherActor.java:69: error: as of release 9, '_' is a keyword, and may not be used as an identifier