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Editorial Team
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Asked: 2026-05-29T08:07:17+00:00

I want to maintain two Log Files in my web-application using apache Log4j.jar: 1)

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I want to maintain two Log Files in my web-application using apache Log4j.jar:

1) One log will contain all the Log messages of every level
2) Second log file will contain the Log messages of specific class

This is the configuration XML that I am using: (Not much aware of the tags used in the XML, was just trying out)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

<appender name="FILE1" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="D:/CSVExportLogs/CSVExportLogFile-ERROR.log"/>
<param name="DatePattern" value="'.'yyyy-MM-dd"/>
<param name="Append" value="true"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c (%F:%L) - %m%n"/>
</layout>
</appender>

<appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="D:/CSVExportLogs/CSVExportLogFile-INFO.log"/>
<param name="DatePattern" value="'.'yyyy-MM-dd"/>
<param name="Append" value="true"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c (%F:%L) - %m%n"/>
</layout>
</appender>


<category name="com.taxware.mgmt.CustomerManager" additivity="false">
<priority value="warn"/>
<appender-ref ref="FILE"/>
</category>

<root>
<priority value="info"/>
<appender-ref ref="FILE1"/>
</root>
</log4j:configuration>

By the above xml I am getting only info messages in the FILE1, I want messages of all levels as well as the message of warn level that are going in the separate file in this file. Is there any solution available for this.

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1 Answer

  1. Editorial Team
    # Create ROOT logger(main logger) with level INFO, and add to it 2 appenders:
# FILE_INFO, FILE_WARN. This means that all loggers by default will writes messages
# in this 2 file appenders, with level INFO or higher
log4j.rootLogger=INFO, FILE_INFO, FILE_WARN

######## LEVELS:
# Set logging level to WARN for all classes and subclasses in package 
# com.taxware.mgmt.CustomerManager
log4j.category.com.taxware.mgmt.CustomerManager=WARN

######## APPENDERS:

# FILE_INFO
# Type of appender
log4j.appender.FILE_INFO=org.apache.log4j.RollingFileAppender
# File where to save all messages
log4j.appender.FILE_INFO.File=D:/CSVExportLogs/CSVExportLogFile-INFO.log
# Max file size, after that will be created new log file, and old file will be renamed
log4j.appender.FILE_INFO.MaxFileSize=100KB
# Maximum amount of old log files.
log4j.appender.FILE_INFO.MaxBackupIndex=100
# Patter of messages.
log4j.appender.FILE_INFO.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE_INFO.layout.ConversionPattern=%d{ISO8601} [%-5p][%-24.24t][%32.32c] - %m%n
# Custom level for appender. In this file will be add only messages with level INFO or highter
log4j.appender.FILE_INFO.Threshold=INFO

# FILE_WARN file appender
log4j.appender.FILE_WARN=org.apache.log4j.RollingFileAppender
log4j.appender.FILE_WARN.File=D:/CSVExportLogs/CSVExportLogFile-WARN.log
log4j.appender.FILE_WARN.MaxFileSize=50KB
log4j.appender.FILE_WARN.MaxBackupIndex=10
log4j.appender.FILE_WARN.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE_WARN.layout.ConversionPattern=%d{ISO8601} [%-5p][%-24.24t][%32.32c] - %m%n
# Custom level for appender. In this file will be add only messages with level WARN or highter
log4j.appender.FILE_WARN.Threshold=WARN
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