SEVERE: The web application [/phox] appears to have started a thread named [Thread-1095] but has failed to stop it. This is very likely to create a memory leak.
мар 11, 2021 2:23:59 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/phox] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@54e7ee49]) and a value of type [org.dom4j.DocumentFactory] (value [org.dom4j.DocumentFactory@5a06e5c2]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
мар 11, 2021 2:23:59 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
S

public class Log4jThreadFilter extends Filter {
	
	@Override
	public int decide(LoggingEvent arg0) {
		if (loggingLevel.get() == null) {
			return NEUTRAL;
		} else {
			return arg0.getLevel().isGreaterOrEqual(loggingLevel.get()) ? NEUTRAL : DENY;
		}
	}
	
	public static void setLoggingLevel(Level level) {
		log.debug("Setting log level to " + level + " for thread " + Thread.currentThread().getName());
		loggingLevel.set(level);
	}
	
	public static void reset() {
		log.debug("Resetting log level for thread " + Thread.currentThread().getName());
		loggingLevel.set(null);
	}
	
	private static final ThreadLocal<Level> loggingLevel = new ThreadLocal<Level>();
	private static final Logger log = Logger.getLogger(Log4jThreadFilter.class);

}

loggingLevel.set(null);

loggingLevel.remove();