Composant Spring permettant de consulter/modifier la configuration LOG4J de son application via JMX

Log4jManagement.java

package com.fbaligand.log4j.jmx;

import java.util.Enumeration;

import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedOperationParameter;
import org.springframework.jmx.export.annotation.ManagedOperationParameters;
import org.springframework.jmx.export.annotation.ManagedResource;

/**
 * Classe MBean permettant par JMX, de :
 * - modifier le niveau de log d'un logger LOG4J
 * - recharger la configuration LOG4J par défaut
 */
@ManagedResource(description="Log4j Configuration Management")
public class Log4jManagement {
	
	/**
	 * modifie à <code>level</code>, le niveau de log du logger <code>loggerName</code>
	 * @param loggerName nom du logger dont on souhaite modifier le niveau de log
	 * @param level nouveau niveau de log du logger
	 */
	@ManagedOperation(description="Update the log level of a logger")
	@ManagedOperationParameters({
	    @ManagedOperationParameter(name = "loggerName", description = "name of the logger"),
	    @ManagedOperationParameter(name = "level", description = "log4j level to set to the logger")
	})
	public void setLogLevel(String loggerName, String level) {
		Logger.getLogger(loggerName).setLevel(Level.toLevel(level));
	}
	
	/**
	 * retourne le niveau de log du logger <code>loggerName</code>
	 * @param loggerName nom du logger dont on souhaite récupérer le niveau de log
	 */
	@ManagedOperation(description="get the log level of a logger")
	@ManagedOperationParameters({
	    @ManagedOperationParameter(name = "loggerName", description = "name of the logger")
	})
	public String getLogLevel(String loggerName) {
		Level loggerLevel = Logger.getLogger(loggerName).getLevel();
		return loggerLevel != null ? loggerLevel.toString() : null;
	}
	
	/**
	 * retourne la liste de tous les loggers avec leur niveau de log sous forme de properties 
	 */
	@ManagedOperation(description="get the list of all log4j loggers")
	@SuppressWarnings("unchecked")
	public String getAllLoggers() {
		Enumeration<Logger> currentLoggers = LogManager.getCurrentLoggers();
		StringBuilder loggers = new StringBuilder();
		while (currentLoggers.hasMoreElements()) {
			String loggerName = currentLoggers.nextElement().getName();
			Level loggerLevel = Logger.getLogger(loggerName).getLevel();
			if (loggerLevel != null) {
				loggers.append(loggerName)
			       .append("=")
			       .append(loggerLevel.toString())
			       .append("\n");
			}
		}
		return loggers.toString();
	}
	
	/**
	 * recharge/réinitialise la configuration par défaut LOG4J
	 */
	@ManagedOperation(description="Reinitialize the log4j configuration")
	public void reinitializeConfiguration() {
		PropertyConfigurator.configure(getClass().getResource("/log4j.properties"));
	}
	
}