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    How do you configure log4j with XML?

    This configuration of log4j with XML consists of following files:

    a.XMLLog4jExample.java
    b.log4j.xml

    XMLLog4jExample.java
    package com.iqjava.log4j; import org.apache.log4j.Logger; import org.apache.log4j.xml.DOMConfigurator; public class XMLLog4jExample { static final Logger logger = Logger.getLogger(XMLLog4jExample.class); public static void main(String[] args) { DOMConfigurator.configure("log4j.xml"); logger.debug("This is a debug message"); logger.info("This is an info message"); logger.warn("This is a warn message"); logger.error("This is an error message"); logger.fatal("This is a fatal message"); } }


    log4j.xml looks like:






    <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="CA" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%-4r [%t] %-5p %c %x - %m%n" /> </layout> </appender> <root> <level value="debug" /> <appender-ref ref="CA" /> </root> </log4j:configuration>


    Here goes the output of the program:

    0 [main] DEBUG com.iqjava.log4j.XMLLog4jExample - This is a debug message 2 [main] INFO com.iqjava.log4j.XMLLog4jExample - This is an info message 2 [main] WARN com.iqjava.log4j.XMLLog4jExample - This is a warn message 2 [main] ERROR com.iqjava.log4j.XMLLog4jExample - This is an error message 2 [main] FATAL com.iqjava.log4j.XMLLog4jExample - This is a fatal message


    Eclipse project structure is depicted as in diagram given below:


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