Log4j is not writing logs into file

Question

Thanks in Advance, I am trying to write logs into a file using log4j, I have tried all log4j.properties but nothing worked. Below is the code.

    import org.apache.logging.log4j.LogManager;
    import org.apache.logging.log4j.Logger;
    import java.io.IOException;
    
    public class Main {
        final static Logger logger = LogManager.getLogger(Main.class);
        public static void main(String[] args) throws IOException {
            logger.info("Hello and welcome!");
    
            // Press Shift+F10 or click the green arrow button in the gutter to run the code.
            for (int i = 1; i <= 50; i++) {
                logger.warn("This is warn : " + i);
                logger.error("This is error : " + i);
                logger.fatal("This is fatal : " + i);
            }
        }
    }

Here is the log4j.properties file placed under src/main/resources/log4j.properties

log4j.appender.file=org.apache.log4j.rolling.RollingFileAppender log4j.appender.file.File=C:\logs\mylog.log log4j.appender.file.ImmediateFlush=true log4j.appender.file.threshold=INFO log4j.appender.file.Append=true log4j.appender.file.MaxFileSize=10MB log4j.appender.file.MaxBackupIndex=20 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n log4j.appender.file.rollingPolicy=org.apache.log4j.rolling.TimeBasedRollingPolicy log4j.appender.file.rollingPolicy.FileNamePattern=C:\logs\mylog%d.log VM configuration: -Dlog4j2.debug=true-Dlog4j2.configurationFile=C:\Users****\resources\log4j.properties

pom.xml => log4j-api & log4j-core as dependencies.

Answer 1

Use this one and set your log path in it and it will work

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration>
    <appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} [%p] %c{1} %m%n"/>
        </layout>
    </appender>

    <appender name="info" class="org.apache.log4j.rolling.RollingFileAppender">
        <rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
            <param name="ActiveFileName" value="{YOUR_LOG_FOLDER_PATH}/log4j-current.log" />
            <param name="FileNamePattern" value="{YOUR_LOG_FOLDER_PATH}/log4j-%d{HH-mm}.%i.log.gz" />
        </rollingPolicy>
        <triggeringPolicy class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
            <param name="MaxFileSize" value="1000" />
        </triggeringPolicy>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p - %m%n" />
        </layout>
    </appender>

    <!--CHANGE name TO ROOT PACKAGE NAME OF YOUR PROJECT THAT YOU WANT TO LOG.-->
    <logger name="org.example" additivity="false">
        <level value="debug"/>
        <appender-ref ref="consoleAppender"/>
        <appender-ref ref="info"/>
    </logger>


<!--    <logger name="org.springframework" additivity="false">-->
<!--        <level value="info"/>-->
<!--        <appender-ref ref="consoleAppender"/>-->
<!--        <appender-ref ref="info"/>-->
<!--    </logger>-->

<!--    <logger name="org.hibernate" additivity="false">-->
<!--        <level value="info"/>-->
<!--        <appender-ref ref="consoleAppender"/>-->
<!--        <appender-ref ref="info"/>-->
<!--    </logger>-->

    <root>
        <priority value="INFO"></priority>
        <appender-ref ref="consoleAppender"/>
        <appender-ref ref="info"/>
    </root>
</log4j:configuration>