Watch k8s events in groovy script

k8s.groovy

#!/usr/bin/env groovy

@Grab('org.slf4j:slf4j-simple:[1,)')
import groovy.util.logging.*

@Grab('io.fabric8:kubernetes-client:[4,)')
import io.fabric8.kubernetes.client.*
import io.fabric8.kubernetes.api.model.*

@Slf4j
class WatchApp {
    def client = new DefaultKubernetesClient()
    WatchApp() {
        client.events().inAnyNamespace().watch(new Watcher<Event>() {
            public void eventReceived(Action action, Event resource) {
                log.info("EVENT : {} : {}", action, resource.message)
            }
            public void onClose(WatcherException e) {
                if (e != null) {
                    e.printStackTrace();
                    log.error(e.getMessage(), e);
                }
            }
        })
    }
}

new WatchApp()