jetty-websocket/javax-websocket-client-impl/src/test/resources/jetty-logging.properties

org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.StdErrLog
org.eclipse.jetty.LEVEL=WARN

# org.eclipse.jetty.websocket.LEVEL=INFO
# org.eclipse.jetty.websocket.LEVEL=ALL
# org.eclipse.jetty.websocket.jsr356.LEVEL=DEBUG