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Log4j2 Multiple appenders example

Given log4j2.xml is reference to configure multiple appenders such as console appender and file appenders. This also configure the dynamic log root path.

Log4j multiple appenders configuration

Sample log4j configuration is given blow. It does following things:

  1. Uses dynamic log root path where log files will be created. Pass environment variable as -DAPP_LOG_ROOT=c:/temp to configure it.
  2. Demo the usage of property constants defined in config file e.g. LOG_PATTERN in below file.
  3. It uses LevelRangeFilter to log different log level statements in different files i.e. debug logs in one file and error logs in separate file.
  4. All logs will be shown in console also.
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30">

    <Properties>
        <Property name="LOG_PATTERN">%d{yyyy-MM-dd'T'HH:mm:ss.SSSZ} %p %m%n</Property>
    </Properties>

    <Appenders>

        <Console name="Console" target="SYSTEM_OUT" follow="true">
            <PatternLayout pattern="${LOG_PATTERN}"/>
        </Console>
        
		<RollingFile name="debugLog" fileName="${sys:APP_LOG_ROOT}/application-debug.log" 
			filePattern="${sys:APP_LOG_ROOT}/application-debug-%d{yyyy-MM-dd}-%i.log">
			<LevelRangeFilter minLevel="DEBUG" maxLevel="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>
			<PatternLayout pattern="${LOG_PATTERN}"/>
			<Policies>
				<SizeBasedTriggeringPolicy size="19500KB" />
			</Policies>
			<DefaultRolloverStrategy max="10"/>
		</RollingFile>
		
		<RollingFile name="infoLog" fileName="${sys:APP_LOG_ROOT}/application-info.log" 
			filePattern="${sys:APP_LOG_ROOT}/application-info-%d{yyyy-MM-dd}-%i.log" >
			<LevelRangeFilter minLevel="INFO" maxLevel="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
			<PatternLayout pattern="${LOG_PATTERN}"/>
			<Policies>
				<SizeBasedTriggeringPolicy size="19500KB" />
			</Policies>
			<DefaultRolloverStrategy max="10"/>
		</RollingFile>
		
		<RollingFile name="errorLog" fileName="${sys:APP_LOG_ROOT}/application-error.log" 
			filePattern="${sys:APP_LOG_ROOT}/application-error-%d{yyyy-MM-dd}-%i.log" >
			<LevelRangeFilter minLevel="ERROR" maxLevel="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
			<PatternLayout pattern="${LOG_PATTERN}"/>
			<Policies>
				<SizeBasedTriggeringPolicy size="19500KB" />
			</Policies>
			<DefaultRolloverStrategy max="10"/>
		</RollingFile>
		
		<RollingFile name="springLog" fileName="${sys:APP_LOG_ROOT}/spring.log" 
			filePattern="${sys:APP_LOG_ROOT}/spring-%d{yyyy-MM-dd}-%i.log" >
			<PatternLayout pattern="${LOG_PATTERN}"/>
			<Policies>
				<SizeBasedTriggeringPolicy size="19500KB" />
			</Policies>
			<DefaultRolloverStrategy max="1"/>
		</RollingFile>
		
		<RollingFile name="aopLog" fileName="${sys:APP_LOG_ROOT}/application-aop.log" 
			filePattern="${sys:APP_LOG_ROOT}/application-aop-%d{yyyy-MM-dd}-%i.log" >
			<PatternLayout pattern="${LOG_PATTERN}"/>
			<Policies>
				<SizeBasedTriggeringPolicy size="19500KB" />
			</Policies>
			<DefaultRolloverStrategy max="1"/>
		</RollingFile>
		
    </Appenders>

    <Loggers>
    
    	<Logger name="com.howtodoinjava.app.aop" additivity="false">
    		<AppenderRef ref="aopLog" />
            <AppenderRef ref="Console" />
        </Logger>
        
        <Logger name="com.howtodoinjava.app" additivity="false">
	        <AppenderRef ref="debugLog" />
	        <AppenderRef ref="infoLog"  />
            <AppenderRef ref="errorLog" />
            <AppenderRef ref="Console"  />
        </Logger>
        
        <Logger name="org.springframework" additivity="false">
            <AppenderRef ref="springLog" />
            <AppenderRef ref="Console"/>
        </Logger>
                
        <Root level="all">
            <AppenderRef ref="Console"/>
        </Root>

    </Loggers>

</Configuration>

Drop me your questions in comments section.

Happy Learning !!

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About Lokesh Gupta

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Feedback, Discussion and Comments

  1. DocBrown

    July 28, 2020

    Many thanks, but one question remains for me. How can you define multiple loggers with log4j2.properties configuration

  2. Shubham

    January 15, 2020

    Can you provide same for log42.properties file

  3. Nimisha

    January 6, 2020

    My main class is not reading from log4j2.xml file.
    How should i make it read from this file?

  4. Ramu

    December 27, 2019

    Hi,
    Good example for multiple appenders. How do we access the these appenders at server side(Java)?

  5. Nishant

    June 21, 2019

    Is there a way in Log4j2 to allow logging specific content to a separate file (audit log)?

    For example, if value x changes, log to file1 that value of x has changed. This file1 is intended to capture audit logs if value of x changes. If this is supported, I would like to scale this to actual business logic for an audit log.

  6. Sopan Shirhdonkar

    October 10, 2018

    Hi, I am using log4j2 with xml config.

    I want to write logs depending upon the class name, i.e. for each testng class a separate log file.

    While running multiple classes from testng, it just writes into the first class name.
    I have written a static method which returns me the logger in utils class.

        public static Logger getDynamicLogger(Class className) {
            SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
            Date date = new Date();
            System.setProperty("logFilename", className.getSimpleName() + "-" + formatter.format(date));
       
            SimpleDateFormat pkgFormatter = new SimpleDateFormat("dd-MMMM-yy");
            System.setProperty("logFileFolder",pkgFormatter.format(date));
          
            ThreadContext.put("className",className.getName());
            Reporter.log(className.getName(),true);
            return LogManager.getLogger(className);
        }
    

    Any idea for this

  7. Kaushik Vankayala

    July 19, 2018

    Hello,

    I am looking for some insight or help regarding the log4j2 configuration or code to write the custom logs to a remote redhat linux and a windows machine. Could you please provide me some help?

    I have seen some log4j links, forums suggesting to use the log4j at sender side and also receiver side. But my application uses log4j2, so could you please care to help?

    Regards

    Kaushik

Comments are closed on this article!

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