Log4j2 HTMLLayout Configuration Example

This Log4j2 example will help you in configuring log4j2.xml file with HTMLLayout. The HTMLLayout generates an HTML page and adds each log statement to a row in a table.

1. HTMLLayout Configuration Options

You can use following attributes while configuring HTMLLayout:

  1. locationInfo – If “true”, location information will be included. The default is false.
  2. title – The title to include in the file header. If none is specified the default title will be used.
  3. contentType – The content type. Defaults to “text/html”.
  4. charset – The character set to use. If not specified, the default will be used.
  5. fontSize – The font size of the text.
  6. font – The font to use for the text.

Let’s see different configurations options for generating HTML format-based log files.

1.1. Log4j2.xml Configuration

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
        <Property name="basePath">C:\\logs</Property>
        <RollingFile name="fileLogger" fileName="${basePath}/app-info.html" 
            <HTMLLayout charset="UTF-8" title="Howtodoinjava Info Logs" locationInfo="true" />
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                <SizeBasedTriggeringPolicy size="10 MB" />
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout   pattern="[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n" />
        <Logger name="com.howtodoinjava" level="debug" additivity="false">
            <appender-ref ref="fileLogger" level="debug" />
        <Root level="debug" additivity="false">
            <appender-ref ref="console" />

1.2. Log4j2.properties Configuration

status = error
name = PropertiesConfig
#Make sure to change log file path as per your need
property.filename = C:\\logs\\app-info.html
filters = threshold
filter.threshold.type = ThresholdFilter
filter.threshold.level = debug
appenders = rolling
appender.rolling.type = RollingFile
appender.rolling.name = RollingFile
appender.rolling.fileName = ${filename}
appender.rolling.filePattern = debug-backup-%d{MM-dd-yy-HH-mm-ss}-%i.html.gz
appender.rolling.layout.type = HTMLLayout
appender.rolling.layout.charset = UTF-8
appender.rolling.layout.title = Howtodoinjava Info Logs
appender.rolling.layout.locationInfo = true
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 20
loggers = rolling
#Make sure to change the package structure as per your application
logger.rolling.name = com.howtodoinjava
logger.rolling.level = debug
logger.rolling.additivity = false
logger.rolling.appenderRef.rolling.ref = RollingFile

1.3. Log4j2.json Configuration

   "configuration": {
      "name": "Default",
      "appenders": {
         "RollingFile": {
            "HTMLLayout": {
               "title":"Howtodoinjava Info Logs",
            "Policies": {
               "SizeBasedTriggeringPolicy": {
                  "size":"10 MB"
            "DefaultRolloverStrategy": {
      "loggers": {
         "root": {
            "appender-ref": {

2. Log Statements

Now let’s use dome log statements to generate log files.

package com.howtodoinjava.log4j2.examples;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Log4j2HelloWorldExample 
	private static final Logger LOGGER = LogManager.getLogger(Log4j2HelloWorldExample.class.getName());
	public static void main(String[] args) 
		LOGGER.debug("Debug Message Logged !!");
		LOGGER.info("Info Message Logged !!");
		LOGGER.debug("Another Debug Message !!");

3. Log4j2 HTMLLayout Output Example

Running the above log files will generate the following HTML file.

Log4j2 HTMLLayout Output
Log4j2 HTMLLayout Output

Drop me your questions in the comments section.




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