Very simple log4j2 XML configuration file using Console and File appender

Question

I'd like a very simple XML configuration file with a console and a file appender using log4j2.

(The Apache Website is killing me with much Information.)

Answer 1

<?xml version="1.0" encoding="UTF-8"?> <Configuration status="INFO">     <Appenders>         <Console name="Console" target="SYSTEM_OUT">             <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />         </Console>         <File name="MyFile" fileName="all.log" immediateFlush="false" append="false">             <PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>         </File>     </Appenders>     <Loggers>         <Root level="debug">             <AppenderRef ref="Console" />             <AppenderRef ref="MyFile"/>         </Root>     </Loggers> </Configuration> 

Notes:

• Put the following content in your configuration file.
• Name the configuration file log4j2.xml
• Put the log4j2.xml in a folder which is in the class-path (i.e. your source folder "src")
• Use Logger logger = LogManager.getLogger(); to initialize your logger
• I did set the immediateFlush="false" since this is better for SSD lifetime. If you need the log right away in your log-file remove the parameter or set it to true

Answer 2

Here is my simplistic log4j2.xml that prints to console and writes to a daily rolling file:

// java private static final Logger LOGGER = LogManager.getLogger(MyClass.class);   // log4j2.xml <?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN">     <Properties>         <Property name="logPath">target/cucumber-logs</Property>         <Property name="rollingFileName">cucumber</Property>     </Properties>     <Appenders>         <Console name="console" target="SYSTEM_OUT">             <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />         </Console>         <RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">             <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />             <Policies>                 <!-- Causes a rollover if the log file is older than the current JVM's start time -->                 <OnStartupTriggeringPolicy />                 <!-- Causes a rollover once the date/time pattern no longer applies to the active file -->                 <TimeBasedTriggeringPolicy interval="1" modulate="true" />             </Policies>         </RollingFile>     </Appenders>     <Loggers>         <Root level="DEBUG" additivity="false">             <AppenderRef ref="console" />             <AppenderRef ref="rollingFile" />         </Root>     </Loggers> </Configuration> 

TimeBasedTriggeringPolicy

interval (integer) - How often a rollover should occur based on the most specific time unit in the date pattern. For example, with a date pattern with hours as the most specific item and and increment of 4 rollovers would occur every 4 hours. The default value is 1.

modulate (boolean) - Indicates whether the interval should be adjusted to cause the next rollover to occur on the interval boundary. For example, if the item is hours, the current hour is 3 am and the interval is 4 then the first rollover will occur at 4 am and then next ones will occur at 8 am, noon, 4pm, etc.

Source: https://logging.apache.org/log4j/2.x/manual/appenders.html

Output:

[INFO ] 2018-07-21 12:03:47,412 ScenarioHook.beforeScenario() - Browser=CHROME32_NOHEAD [INFO ] 2018-07-21 12:03:48,623 ScenarioHook.beforeScenario() - Screen Resolution (WxH)=1366x768 [DEBUG] 2018-07-21 12:03:52,125 HomePageNavigationSteps.I_Am_At_The_Home_Page() - Base URL=http://simplydo.com/projector/ [DEBUG] 2018-07-21 12:03:52,700 NetIncomeProjectorSteps.I_Enter_My_Start_Balance() - Start Balance=348000 

A new log file will be created daily with previous day automatically renamed to:

cucumber_yyyy-MM-dd.log

In a Maven project, you would put the log4j2.xml in src/main/resources or src/test/resources.