Technologies - Log4J - Create Log4j Configuration File - Where ? How ? What ?

 

Typical Steps involved in Creating Log4j Configuration file

1. Configure the root logger - What to Log - info/debug/error/fatal messages
2. Configure individual loggers (if needed).
3. Specify appenders -- Where to Log -- in File/Console, etc
4. Specify message layout/Pattern -- How to Log - format to log the message

Configuring a Layout

PatternLayout lets you determine how data is extracted from log events and formatted for output based on a conversion pattern. Conversion patterns act as placeholders for data that appears in each log event. 

For example, let’s break down a PatternLayout commonly used in Log4j:

<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>

%d{HH:mm:ss.SSS} formats the date in terms of hours, minutes, seconds, and milliseconds. %t displays the Logger’s current thread. %level displays the severity of the log event. %logger displays the name of the Logger. %m displays the event’s message. Finally, %n adds a new line for the next event. 

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<?xml version="1.0" encoding="UTF-8"?>

<Configuration status="WARN">

<Properties>

<Property name="basePath">./logs</Property>

</Properties>

<Appenders>

<RollingFile name="File"

fileName="${basePath}/testlogs.log"

filePattern="${basePath}/testlogs-%d{yyyy-MM-dd}.log">

<PatternLayout

pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />

<SizeBasedTriggeringPolicy size="1024" />

</RollingFile>

<Console name="Console" target="SYSTEM_OUT">

<PatternLayout

pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />

</Console>

</Appenders>

<Loggers>

<Logger name="com.SeleniumPractise" level="error">

<AppenderRef ref="File" />

</Logger>

<Logger name="regressionSuite" level="Debug">

<AppenderRef ref="Console" />

</Logger>

<Root level="trace">

<AppenderRef ref="File" />

</Root>

</Loggers>

</Configuration>

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