How to update the Log4J logger level dynamically for a web application?

Are you looking for an option o update the Log4J logger level dynamically for a web application? If so, here is the solution for people like you to update the logger which doesn’t require any log4j,xml file configuration change or serve restart.

Here we had developed a jsp page that will show the current loggerName, loggerlevel and the list of logger levels lits it can take. Now, you can select the new log level from selectbox to set the new logger on the fly.

Here is the code sample. Wanna try?

<%@ page import="org.apache.log4j.*"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<%

            Logger logger = Logger.getRootLogger();

            logger.setLevel(Level.toLevel(

                                    request.getParameter("selectedLevel"), Level.INFO));

%>

           

                       

           

           

                       

                       

                       

           

           

                       

                       

                       

           

Dynamic Log4J control
Current Log Level	Logger Name	Set New Log level
${rootLogger.level}	${rootLogger.name}	${level}