How to maintain a separate logs for some functionality of your application ?

Setup the log4j.properties

# Set root logger level to WARN and append to stdout

log4j.rootLogger=ERROR, stdout, SYSLOG  

log4j.logger.NoModule=ERROR    

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.

log4j.appender.stdout.layout.ConversionPattern=%d %5p (%c:%L) - %m%n

# Print only messages of level ERROR or above in the package noModule.

log4j.logger.noModule=ERROR

# Entries for Login Logger

log4j.logger.com.shaan.logging.LoginLogger=INFO, login, SYSLOG

log4j.appender.login=org.apache.log4j.RollingFileAppender

log4j.appender.login.File=Login.log

log4j.appender.login.MaxFileSize=1000KB

log4j.appender.login.MaxBackupIndex=10

log4j.appender.login.layout=org.apache.log4j.PatternLayout

log4j.appender.login.layout.ConversionPattern=%d (%t) [%24F:%-3L:%-5p]%x %m%n

# Added for SYSLOG generation on audit requirment

log4j.appender.SYSLOG=org.apache.log4j.net.SyslogAppender

log4j.appender.SYSLOG.syslogHost=10.200.205.100

log4j.appender.SYSLOG.layout=org.apache.log4j.PatternLayout

log4j.appender.SYSLOG.layout.ConversionPattern=%-5p -%m

log4j.appender.SYSLOG.Facility=LOCAL1

Create a customized logger class to write the logs

package com.shaan.logging;

public class LoginLogger {

  private static final String logModule = LoginLogger.class.getName();

  public static void log(Map logValues) {

    // Use logValues map for writing values

    Debug.logInfo("logs to write ...", logModule);

  }

}

Now, you can use this class and its method to write log in a separate log file.